JP4830283B2 - Organic electroluminescence element, display device and lighting device - Google Patents

Description

  The present invention relates to an organic electroluminescence element, a display device, and a lighting device.

  Conventionally, as a light-emitting electronic display device, there is an electroluminescence display (hereinafter referred to as ELD). Examples of the constituent elements of ELD include inorganic electroluminescent elements and organic electroluminescent elements (hereinafter also referred to as organic EL elements). Inorganic electroluminescent elements have been used as planar light sources, but an alternating high voltage is required to drive the light emitting elements. An organic EL device has a structure in which a light emitting layer containing a compound that emits light is sandwiched between a cathode and an anode, and injects electrons and holes into the light emitting layer and recombines them to generate excitons. An element that emits light by using light emission (fluorescence / phosphorescence) when this exciton is deactivated, and can emit light at a voltage of several V to several tens V, and is self-luminous. Therefore, it has a wide viewing angle, high visibility, and since it is a thin-film type complete solid-state device, it has attracted attention from the viewpoints of space saving and portability.

  However, in organic EL elements for practical use in the future, development of organic EL elements that emit light efficiently and with high luminance with lower power consumption is desired.

  In Japanese Patent No. 3093796, a small amount of phosphor is doped into a stilbene derivative, a distyrylarylene derivative or a tristyrylarylene derivative to achieve an improvement in light emission luminance and a longer device lifetime.

  Further, an element having an organic light-emitting layer in which an 8-hydroxyquinoline aluminum complex is used as a host compound and a small amount of phosphor is doped thereto (for example, JP-A 63-264692), and an 8-hydroxyquinoline aluminum complex is used as a host compound. For example, an element having an organic light emitting layer doped with a quinacridone dye (for example, JP-A-3-255190) is known.

  As described above, when light emission from excited singlet is used, the generation ratio of singlet excitons and triplet excitons is 1: 3, and thus the generation probability of luminescent excited species is 25%. Since the efficiency is about 20%, the limit of the external extraction quantum efficiency (ηext) is set to 5%.

  However, since Princeton University reported on organic EL devices using phosphorescence emission from excited triplets (MA Baldo et al., Nature, 395, 151-154 (1998)), at room temperature. Research on materials that exhibit phosphorescence has become active.

  For example, M.M. A. Baldo et al. , Nature, 403, 17, 750-753 (2000), US Pat. No. 6,097,147, and the like.

  When excited triplets are used, the upper limit of internal quantum efficiency is 100%, so that in principle the luminous efficiency is four times that of excited singlets, and there is a possibility that almost the same performance as cold cathode tubes can be obtained. Therefore, it is attracting attention as a lighting application.

  For example, S.M. Lamansky et al. , J .; Am. Chem. Soc. , 123, 4304 (2001), etc., many compounds have been studied for synthesis centering on heavy metal complexes such as iridium complexes.

  In addition, the aforementioned M.I. A. Baldo et al. , Nature, Vol. 403, No. 17, pages 750-753 (2000), studies have been made using tris (2-phenylpyridine) iridium as a dopant.

In addition, M.M. E. Thompson et al., In The 10th International Works on Inorganic and Organic Electroluminescence (EL'00, Hamamatsu), used L ₂ Ir (acac), for example, (ppy) ₂ Ir (acac) as a dopant. 0 g, Tetsuo Tsutsui, etc., again, The 10th International Workshop on Inorganic and Organic Electroluminescence (EL'00, Hamamatsu) in, as a dopant tris (2-(p-tolyl) pyridine) iridium (Ir (ptpy) _3), Studies using tris (benzo [h] quinoline) iridium (Ir (bzq) ₃ ) and the like are being conducted (note that these metal complexes are generally called orthometalated iridium complexes).

  Since then, many iridium complexes have been studied for synthesis, and attempts have been made to use them as elements (see, for example, Patent Documents 1 to 10 and Non-Patent Documents 1 to 4). In addition, it is known to introduce an electron withdrawing group such as a fluorine atom, a trifluoromethyl group or a cyano group into phenylpyridine as a substituent, and to introduce picolinic acid or a pyrazabole-based ligand as a ligand. (For example, refer to Patent Documents 7 to 10 and Non-Patent Documents 3 to 4.) However, with these ligands, while it is possible to achieve a highly efficient device, the light emission lifetime of the device is greatly deteriorated. There was a need for improvement.

  On the other hand, in order to obtain high luminous efficiency, in the 10th International Works on Inorganic and Organic Electroluminescence (EL'00, Hamamatsu), Ikai et al. Uses a hole transporting compound as a host of a phosphorescent compound. In addition, M.M. E. Thompson et al. Use various electron transporting materials as a host of a phosphorescent compound, doped with a novel iridium complex. Furthermore, carbazole derivatives and carboline derivatives are known as light-emitting hosts of phosphorescent elements used in combination with the dopants described above (for example, Patent Documents 11 to 13).

In any case, the light emission luminance and light emission efficiency of the light emitting device are greatly improved compared to conventional devices because the emitted light is derived from phosphorescence. There was a problem that it was lower than the conventional element.
Phosphorescent high-efficiency light-emitting materials have significantly different device performance depending on how they are combined with the light-emitting host, but it is possible to achieve both the light-emitting efficiency of the device and the light-emission lifetime, and to achieve performance that can withstand practical use. The current situation is not done.
JP 2002-332291 A JP 2002-332292 A JP 2002-175484 A JP 2001-247859 A JP 2001-345183 A JP 2003-146996 A International Publication No. 02/15645 Pamphlet JP 2003-123982 A JP 2002-117978 A International Publication No. 04/016711 Pamphlet Japanese Patent Laid-Open No. 2003-77664 International Publication No. 04/053019 Pamphlet International Publication No. 04/074399 Pamphlet J. et al. Am. Chem. Soc. , 123, 4304 (2001) JACS Inorganic Chemistry, Vol. 40, No. 7, pp. 1704-1711 (2001) Applied Physics Letters, Volume 79, 2082 (2001) Applied Physics Letters, 83, 3818 (2003)

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an organic EL element, a lighting device, and a display device that exhibit high light emission efficiency and have a long light emission lifetime.

The above object of the present invention has been achieved by the following constitutions 1 to 16 .

1. An organic electroluminescence device comprising a platinum complex represented by the following general formula (A) and a compound represented by the following general formula (1) in a hole blocking layer.

[Wherein Z ₁₁ represents an atomic group necessary for forming a benzene ring or a pyridine ring . R ₁₁ represents a substituent, and X ₁₁ represents an oxygen atom, a sulfur atom, or —N (R ₁₂ ) — (R ₁₂ represents a hydrogen atom or a substituent). n11 represents the integer of 0-2. ]

Wherein, Z ₁ represents a pyridine ring, Z ₂ represents a benzene ring or a pyridine ring, Z ₃ represents a single composed bond. R ₁₀₁ represents a hydrogen atom or a substituent. ]
2. An organic electroluminescence device comprising the platinum complex represented by the following general formula (B) and the compound represented by the general formula (1) described in 1 above in the hole blocking layer.

[ Wherein Z ₂₁ represents an atomic group necessary for forming a pyridine ring . R ₂₁ represents a substituent, and X ₂₁ represents an oxygen atom, a sulfur atom, or —N (R ₂₂ ) — (R ₂₂ represents a hydrogen atom or a substituent). n21 represents an integer of 0 to 2. ]

3. 3. The organic electroluminescence device as described in 1 or 2 above, wherein the compound represented by the general formula (1) is represented by the following general formula (1-1).

[Wherein, R _{501 to} R ₅₀₇ each independently represents a hydrogen atom or a substituent. ]
4). 3. The organic electroluminescence device according to 1 or 2 , wherein the compound represented by the general formula (1) is represented by the following general formula (1-2).

[Wherein, R _{511 to} R ₅₁₇ each independently represents a hydrogen atom or a substituent. ]
5. 3. The organic electroluminescence device as described in 1 or 2 above, wherein the compound represented by the general formula (1) is represented by the following general formula (1-3).

[Wherein, R _{521 to} R ₅₂₇ each independently represents a hydrogen atom or a substituent. ]
6). 3. The organic electroluminescence device according to 1 or 2 , wherein the compound represented by the general formula (1) is represented by the following general formula (1-4).

[Wherein, R _{531 to} R ₅₃₇ each independently represents a hydrogen atom or a substituent. ]
7). 3. The organic electroluminescence device as described in 1 or 2 above, wherein the compound represented by the general formula (1) is represented by the following general formula (1-5).

[Wherein, R _{541 to} R ₅₄₈ each independently represents a hydrogen atom or a substituent. ]
8). 3. The organic electroluminescence device as described in 1 or 2 above, wherein the compound represented by the general formula (1) is represented by the following general formula (1-6).

[Wherein, R _{551 to} R ₅₅₈ each independently represents a hydrogen atom or a substituent. ]
9. 3. The organic electroluminescence device as described in 1 or 2 above, wherein the compound represented by the general formula (1) is represented by the following general formula (1-7).

[Wherein, R _{561 to} R ₅₆₇ each independently represents a hydrogen atom or a substituent. ]
10. 3. The organic electroluminescence device as described in 1 or 2 above, wherein the compound represented by the general formula (1) is represented by the following general formula (1-8).

[Wherein, R _{571 to} R ₅₇₇ each independently represents a hydrogen atom or a substituent. ]
11. 3. The organic electroluminescence device as described in 1 or 2 above, wherein the compound represented by the general formula (1) is represented by the following general formula (1-9).

[Wherein, R represents a hydrogen atom or a substituent. The plurality of R may be the same or different. ]
12 3. The organic electroluminescence device according to 1 or 2 , wherein the compound represented by the general formula (1) is represented by the following general formula (1-10).

[Wherein, R represents a hydrogen atom or a substituent. The plurality of R may be the same or different. ]
13. Compound represented by the general formula (1) is, in the 1 or 2, characterized in that it has at least one group represented by any one of the following formulas (2-1) to (2-8) The organic electroluminescent element of description.

[In the formula, R _{502 to} R ₅₀₇ , R _{512 to} R ₅₁₇ , R _{522 to} R ₅₂₇ , R _{532 to} R ₅₃₇ , R _{542 to} R ₅₄₈ , R _{552 to} R ₅₅₈ , R _{562 to} R ₅₆₇ , R _{572 to} R ₅₇₇ each independently represents a hydrogen atom or a substituent, and the substituents may be the same or different. ]
14 3. The organic electroluminescence device as described in 1 or 2 above, which comprises a phosphorescent light-emitting layer as a constituent layer, and the phosphorescent light-emitting layer contains a compound represented by the general formula (1).

15. 15. A display device comprising the organic electroluminescent element according to any one of 1 to 14 above.

16. 15. An illumination device comprising the organic electroluminescence element according to any one of 1 to 14 above.

  According to the present invention, it was possible to provide an organic EL element, a lighting device, and a display device that exhibit high luminous efficiency and have a long luminous lifetime.

In the organic EL device of the present invention, the structure as defined in any one of claims 1-16, showed high luminous efficiency and a long organic EL device emission lifetime, an illuminating device and a display device I was able to.

  As a result of intensive studies on the above problems, the present inventors have expressed at least one compound represented by the general formulas (A) to (H) as a platinum complex and the general formula (1). It has been found that the light emission lifetime, which has been a problem of organic EL devices produced using conventional organic EL device materials, can be significantly improved by using the compound together.

  The compound represented by the general formula (1) is preferably contained in a light emitting layer or a hole blocking layer described later. The compound represented by the general formula (1) is preferably used as a host material in the light emitting layer, and is preferably used as a hole blocking material when used in the hole blocking layer. This will also be described in detail later.

  Hereinafter, details of each component according to the present invention will be sequentially described.

《Platinum complex》
The platinum complex represented by the general formula (A) according to the present invention will be described.

As the platinum complex-containing layer represented by the general formula (A) according to the present invention, a light-emitting layer and / or a hole blocking layer described later are preferable, and when contained in the light-emitting layer, By using it as a light-emitting dopant, it is possible to increase the efficiency of external extraction quantum efficiency (higher brightness) of the organic EL device of the present invention and to increase the light emission lifetime.

<< General formula (A) >>
Oite in Formula (A), the aromatic hydrocarbon ring formed by Z _11, include a benzene ring.

Furthermore, the benzene ring may have a substituent represented by R ₁₁ in the general formula (A) described later.

Oite in Formula (A), the aromatic heterocyclic ring formed by Z _11, include a pyridine ring.

Furthermore, the pyridine ring may have a substituent represented by R ₁₁ in the general formula (1) described later.

Oite general formula _{(A), X 11} is an oxygen atom, a sulfur atom, -N _{(R 12)} - represents a.

Here, in the general formula (A), examples of the substituent represented by R ₁₁ and R ₁₂ include an alkyl group (for example, a methyl group, an ethyl group, an isopropyl group, a hydroxyethyl group, a methoxymethyl group, a trimethyl group). Fluoromethyl group, t-butyl group, etc.), cycloalkyl group (eg, cyclopentyl group, cyclohexyl group, etc.), aralkyl group (eg, benzyl group, 2-phenethyl group, etc.), aromatic hydrocarbon group (eg, phenyl group) , P-chlorophenyl group, mesityl group, tolyl group, xylyl group, biphenylyl group, naphthyl group, anthryl group, phenanthryl group, etc.), aromatic heterocyclic group (for example, furyl group, thienyl group, pyridyl group, pyridazinyl group, pyrimidinyl group) Group, pyrazinyl group, triazinyl group, imidazolyl group, pyrazolyl group, thiazolyl group, quinazolini Group, carbazolyl group, carbolinyl group, diazacarbazolyl group (diazacarbazolyl group is a group in which any one of the carbon atoms constituting the carboline ring of the carbolinyl group is substituted with a nitrogen atom. .), Phthalazinyl group, etc.), alkoxyl group (eg, ethoxy group, isopropoxy group, butoxy group, etc.), aryloxy group (eg, phenoxy group, naphthyloxy group, etc.), cyano group, hydroxyl group, alkenyl group (eg, Vinyl group, etc.), styryl group, halogen atom (for example, chlorine atom, bromine atom, iodine atom, fluorine atom, etc.). These groups may be further substituted.

In the present invention, a coordination bond is formed (also referred to as complex formation ) between the general formula (A) and platinum (which may be a metal or an ion) to form a platinum complex.

<< General formula (B) >>
Oite general formula _(B), pyridine ring formed by _{Z 21} is Oite the formula _(A), the same meaning as pyridine ring formed by _{Z 11.}

Oite general formula (B), the substituent represented by _{R 21} are the same as the substituents represented by Oite _{R 11} in the general formula (A).

Hereinafter, although the specific example of the platinum complex represented by the said general formula (A) or the general formula (B) based on this invention is shown, this invention is not limited to these.

  The platinum complex according to the present invention is described in, for example, Organic Letter, vol. 16, p 2579-2581 (2001), J. MoI. Am. Chem. Soc. , 123, 4304 (2001), Inorganic Chemistry, Vol. 40, No. 7, pages 1704-1711 (2001), and by applying methods such as references described in these documents Can be synthesized.

<< Compound Represented by Formula (1) >>
The compound represented by the general formula (1) according to the present invention will be described.

The compound represented by the general formula (1) according to the present invention has a potential lower than that of CBP, which has been conventionally used as a light emitting host and is well known to those skilled in the art. Need to be combined appropriately. The platinum complex represented by the general formula (A) or the general formula (B) satisfies this, and when used in combination, the injection balance of holes and electrons is improved and the efficiency is improved. It is estimated that

  In addition, as a luminescent host used in combination with these luminescent materials, the compound represented by the general formula (1) according to the present invention has better durability than conventionally used CBP and electron transport materials, It was found that the light emission lifetime of the device can also be improved.

In the general formula (1), Z ₁ represents a pyridine ring , Z ₂ represents a benzene ring or a pyridine ring , and Z ₃ represents a simple bond . R ₁₀₁ represents a hydrogen atom or a substituent.

In the general formula (1), the pyridine ring represented by Z ₁ and Z ₂ may have a substituent represented by R ₁₀₁ described later.

In the general formula (1), the benzene ring represented by Z ₂ may have a substituent represented by R ₁₀₁ described later.

In the general formula (1), examples of the substituent represented by R ₁₀₁ include an alkyl group (eg, methyl group, ethyl group, propyl group, isopropyl group, tert-butyl group, pentyl group, hexyl group, octyl group, dodecyl group). Group, tridecyl group, tetradecyl group, pentadecyl group, etc.), cycloalkyl group (eg, cyclopentyl group, cyclohexyl group, etc.), alkenyl group (eg, vinyl group, allyl group, etc.), alkynyl group (eg, ethynyl group, propargyl group, etc.) Etc.), aryl groups (eg phenyl group, naphthyl group etc.), aromatic heterocyclic groups (eg furyl group, thienyl group, pyridyl group, pyridazinyl group, pyrimidinyl group, pyrazinyl group, triazinyl group, imidazolyl group, pyrazolyl group) , Thiazolyl group, quinazolinyl group, phthalazinyl group, etc.), heterocyclic group (eg Pyrrolidyl group, imidazolidyl group, morpholyl group, oxazolidyl group, etc.), alkoxyl group (for example, methoxy group, ethoxy group, propyloxy group, pentyloxy group, hexyloxy group, octyloxy group, dodecyloxy group, etc.), cyclo An alkoxyl group (eg, cyclopentyloxy group, cyclohexyloxy group, etc.), an aryloxy group (eg, phenoxy group, naphthyloxy group, etc.), an alkylthio group (eg, methylthio group, ethylthio group, propylthio group, pentylthio group, hexylthio group, Octylthio group, dodecylthio group etc.), cycloalkylthio group (eg cyclopentylthio group, cyclohexylthio group etc.), arylthio group (eg phenylthio group, naphthylthio group etc.), alkoxycarbonyl group (eg meso Ruoxycarbonyl group, ethyloxycarbonyl group, butyloxycarbonyl group, octyloxycarbonyl group, dodecyloxycarbonyl group, etc.), aryloxycarbonyl group (eg, phenyloxycarbonyl group, naphthyloxycarbonyl group, etc.), sulfamoyl group (eg, Aminosulfonyl group, methylaminosulfonyl group, dimethylaminosulfonyl group, butylaminosulfonyl group, hexylaminosulfonyl group, cyclohexylaminosulfonyl group, octylaminosulfonyl group, dodecylaminosulfonyl group, phenylaminosulfonyl group, naphthylaminosulfonyl group, 2-pyridylaminosulfonyl group, etc.), acyl group (for example, acetyl group, ethylcarbonyl group, propylcarbonyl group, pentylcarbonyl group, cyclyl group) Hexylcarbonyl group, octylcarbonyl group, 2-ethylhexylcarbonyl group, dodecylcarbonyl group, phenylcarbonyl group, naphthylcarbonyl group, pyridylcarbonyl group, etc.), acyloxy group (for example, acetyloxy group, ethylcarbonyloxy group, butylcarbonyloxy group) Octylcarbonyloxy group, dodecylcarbonyloxy group, phenylcarbonyloxy group, etc.), amide group (for example, methylcarbonylamino group, ethylcarbonylamino group, dimethylcarbonylamino group, propylcarbonylamino group, pentylcarbonylamino group, cyclohexylcarbonyl) Amino group, 2-ethylhexylcarbonylamino group, octylcarbonylamino group, dodecylcarbonylamino group, phenylcarbonylamino group, naphthy Carbonylamino group, etc.), carbamoyl group (eg, aminocarbonyl group, methylaminocarbonyl group, dimethylaminocarbonyl group, propylaminocarbonyl group, pentylaminocarbonyl group, cyclohexylaminocarbonyl group, octylaminocarbonyl group, 2-ethylhexylamino) Carbonyl group, dodecylaminocarbonyl group, phenylaminocarbonyl group, naphthylaminocarbonyl group, 2-pyridylaminocarbonyl group, etc.), ureido group (for example, methylureido group, ethylureido group, pentylureido group, cyclohexylureido group, octylureido group) , Dodecylureido group, phenylureido group naphthylureido group, 2-pyridylaminoureido group, etc.), sulfinyl group (for example, methylsulfinyl group, ethyl) Rufinyl group, butylsulfinyl group, cyclohexylsulfinyl group, 2-ethylhexylsulfinyl group, dodecylsulfinyl group, phenylsulfinyl group, naphthylsulfinyl group, 2-pyridylsulfinyl group, etc.), alkylsulfonyl group (for example, methylsulfonyl group, ethylsulfonyl group) , Butylsulfonyl group, cyclohexylsulfonyl group, 2-ethylhexylsulfonyl group, dodecylsulfonyl group, etc.), arylsulfonyl group (phenylsulfonyl group, naphthylsulfonyl group, 2-pyridylsulfonyl group etc.), amino group (for example, amino group, ethyl group) Amino group, dimethylamino group, butylamino group, cyclopentylamino group, 2-ethylhexylamino group, dodecylamino group, anilino group, naphthylamino group, 2-pyridy Amino groups, etc.), halogen atoms (eg, fluorine atoms, chlorine atoms, bromine atoms, etc.), fluorinated hydrocarbon groups (eg, fluoromethyl groups, trifluoromethyl groups, pentafluoroethyl groups, pentafluorophenyl groups, etc.), And cyano group, nitro group, hydroxy group, mercapto group, silyl group (for example, trimethylsilyl group, triisopropylsilyl group, triphenylsilyl group, phenyldiethylsilyl group, etc.).

  These substituents may be further substituted with the above substituents. In addition, a plurality of these substituents may be bonded to each other to form a ring.

  Preferred substituents are an alkyl group, a cycloalkyl group, a fluorinated hydrocarbon group, an aryl group, and an aromatic heterocyclic group.

  A mere bond is a bond that directly bonds the connecting substituents together.

In the present invention, Z _{1 in the} general formula (1) is preferably a 6-membered ring. Thereby, luminous efficiency can be made higher. Furthermore, the lifetime can be further increased.

In the present invention, it is preferable that the Z ₂ in the general formula (1) is a 6-membered ring. Thereby, luminous efficiency can be made higher. Furthermore, the lifetime can be further increased.

Furthermore, it is preferable that Z ₁ and Z _{2 in} the general formula (1) are both 6-membered rings because the luminous efficiency can be further increased. Furthermore, it is preferable because the lifetime can be further increased.

  Preferred among the compounds represented by the general formula (1) are compounds represented by the general formulas (1-1) to (1-10).

In the general formula (1-1), R _{501 to} R ₅₀₇ each independently represent a hydrogen atom or a substituent.

  By using the compound represented by the general formula (1-1), an organic EL device with higher luminous efficiency can be obtained. Furthermore, it can be set as a longer life organic EL element.

In the general formula (1-2), R _{511 to} R ₅₁₇ each independently represent a hydrogen atom or a substituent.

  By using the compound represented by the general formula (1-2), an organic EL device with higher luminous efficiency can be obtained. Furthermore, it can be set as a longer life organic EL element.

In the general formula (1-3), R _{521 to} R ₅₂₇ each independently represent a hydrogen atom or a substituent.

  By using the compound represented by the general formula (1-3), an organic EL device with higher luminous efficiency can be obtained. Furthermore, it can be set as a longer life organic EL element.

In the general formula (1-4), R _{531 to} R ₅₃₇ each independently represents a hydrogen atom or a substituent.

  By using the compound represented by the general formula (1-4), an organic EL device with higher luminous efficiency can be obtained. Furthermore, it can be set as a longer life organic EL element.

In Formula (1-5), R ₅₄₁ ~R ₅₄₈ each independently represents a hydrogen atom or a substituent.

  By using the compound represented by the general formula (1-5), an organic EL device with higher luminous efficiency can be obtained. Furthermore, it can be set as a longer life organic EL element.

In the general formula (1-6), R _{551 to} R ₅₅₈ each independently represent a hydrogen atom or a substituent.

  By using the compound represented by the general formula (1-6), an organic EL device with higher luminous efficiency can be obtained. Furthermore, it can be set as a longer life organic EL element.

In the general formula (1-7), R _{561 to} R ₅₆₇ each independently represent a hydrogen atom or a substituent.

  By using the compound represented by the general formula (1-7), an organic EL device with higher luminous efficiency can be obtained. Furthermore, it can be set as a longer life organic EL element.

In the general formula (1-8), R _{571 to} R ₅₇₇ each independently represent a hydrogen atom or a substituent.

  By using the compound represented by the general formula (1-8), an organic EL device with higher luminous efficiency can be obtained. Furthermore, it can be set as a longer life organic EL element.

  In the general formula (1-9), R represents a hydrogen atom or a substituent. The plurality of R may be the same or different.

  By using the compound represented by the said General formula (1-9), it can be set as an organic electroluminescent element with higher luminous efficiency. Furthermore, it can be set as a longer life organic EL element.

  In the general formula (1-10), R represents a hydrogen atom or a substituent. The plurality of R may be the same or different.

Here, in each of the general formulas (1-1) to (1-10), the “substituent” has the same meaning as the substituent represented by R ₁₀₁ in the general formula (1).

  By using the compound represented by the general formula (1-10), an organic EL device with higher luminous efficiency can be obtained. Furthermore, a long-life organic EL element can be obtained.

In addition, the compound represented by the general formula (1) is preferably a compound having at least one group represented by any one of the general formulas (2-1) to (2-8). In particular, it is more preferable to have 2 to 4 groups represented by any one of the general formulas (2-1) to (2-8) in the molecule. In this case, the structure represented by the general formula (1) includes a case where the portion excluding R ₁₀₁ is replaced by the general formulas (2-1) to (2-8).

  The compound represented by the general formula (1) according to the present invention is used as a constituent component of a constituent layer of an organic EL element to be described later. It is preferably contained in the hole blocking layer. In the light emitting layer, it is preferably used as a host compound (also referred to as a light emitting host), and in the hole blocking layer, it is preferably used as a hole blocking material.

  However, from the viewpoint of controlling various physical properties of the organic EL element, the compound according to the present invention may be used in other constituent layers of the organic EL element as necessary.

  Hereinafter, although the specific example of the compound represented by the said General formula (1) based on this invention is shown, this invention is not limited to these.

<< Application of Platinum Complex of the Present Invention and Compound Represented by General Formula (1) to Organic EL Device >>
When producing the organic EL device of the present invention using the platinum complex according to the present invention and the compound represented by the general formula (1), the light emitting layer is included in the constituent layers of the organic EL device (details will be described later). Or it is preferable to use for a hole-blocking layer. In the light-emitting layer, a platinum complex is preferably used as a light-emitting dopant, and a compound represented by the general formula (1) is preferably used as a host compound.

  The mixing ratio of the light-emitting dopant to the host compound (light-emitting host) in the light-emitting layer is preferably adjusted to a range of 0.1% by mass to less than 30% by mass.

  However, the light-emitting dopant may be a mixture of a plurality of types of compounds, and the partner to be mixed may be another metal complex having a different structure, or a phosphorescent dopant or a fluorescent dopant having another structure.

  Next, a configuration of a typical organic EL element will be described.

The platinum complex represented by the general formula (A) or the general formula (B) and the compound represented by the general formula (1) according to the present invention are each an organic EL element material (backlight, flat panel). Display, illumination light source, display element, electrophotographic light source, recording light source, exposure light source, reading light source, sign, signboard, interior, optical communication device, etc.) Organic semiconductor laser materials (recording light source, exposure light source, reading light source optical communication device, electrophotographic light source, etc.), electrophotographic photosensitive material, organic TFT element materials (organic memory element, organic arithmetic element, organic switching element) It can be used in a wide range of fields such as materials for organic wavelength conversion elements and materials for photoelectric conversion elements (solar cells, optical sensors, etc.).

  Next, the constituent layers of the organic EL device of the present invention will be described in detail.

In this invention, although the preferable specific example of the layer structure of an organic EL element is shown below, this invention is not limited to these.
(I) Anode / light emitting layer / electron transport layer / cathode (ii) Anode / hole transport layer / light emitting layer / electron transport layer / cathode (iii) Anode / hole transport layer / light emitting layer / hole blocking layer / electron Transport layer / cathode (iv) anode / hole transport layer / light emitting layer / hole blocking layer / electron transport layer / cathode buffer layer / cathode (v) anode / anode buffer layer / hole transport layer / light emitting layer / hole Blocking layer / electron transport layer / cathode buffer layer / cathode << light emitting layer >>
The light-emitting layer is a layer that emits light by recombination of electrons and holes injected from the electrode, the electron transport layer, or the hole transport layer. It may be an interface with an adjacent layer. The light emitting layer may be a layer having a single composition, or may be a laminated structure including a plurality of layers having the same or different compositions.

  When the light-emitting layer contains two or more kinds of compounds as described above, the main component constituting the light-emitting layer includes a host compound (also simply referred to as a light-emitting host) and a dopant (also referred to as a light-emitting dopant). Either a phosphorescent type (phosphorescent dopant) or a fluorescent type (fluorescent dopant) may be used. However, in the phosphorescent organic electroluminescence element, phosphorescence is emitted from the host compound. The phosphorescent dopant emits light by energy transfer to the dopant (also referred to as a phosphorescent dopant), and as a result, phosphorescent emission is extracted.

In the present invention, a configuration in which the compound represented by the general formula (1) is used as a host compound and the platinum complex represented by the general formula (A) or the general formula (B) is used as a phosphorescent dopant is preferable. Moreover, only 1 type may be used for a phosphorescent dopant and multiple types may be used for it. When an organic electroluminescent element is formed by laminating a plurality of light emitting layers, the phosphorescent dopant contained in each layer may be the same or different, or may be a single type or a plurality of types. May be.

  The “phosphorescent dopant” in the present invention is a compound in which light emission from an excited triplet is observed, and is a compound having a phosphorescence quantum yield of 0.001 or more at 25 ° C. The phosphorescence quantum yield is preferably 0.01 or more, more preferably 0.1 or more. The phosphorescence quantum yield can be measured by the method described in Spectroscopic II, page 398 (1992 edition, Maruzen) of Experimental Chemistry Course 4 of the 4th edition. Although the phosphorescence quantum yield in a solution can be measured using various solvents, the phosphorescence emitting compound used in the present invention is only required to achieve the phosphorescence quantum yield in any solvent.

  The “fluorescent light emitting dopant” in the present invention is also defined in the same manner as the phosphorescent light emitting dopant.

  By using such a phosphorescent compound as a dopant in the light emitting layer, a light emitting organic EL device having high internal quantum efficiency can be realized. Specifically, Y.M. Wang et al. , Appl. Phys. Lett. 79, No. 4, 449-451 (2001), C.I. Adachi et al. 79, No. 13, 2082-2084 (2001), and the like. Preferably, a complex having a central metal such as iridium, osmium, rhodium and platinum and an organic ligand is used. More preferably used is a platinum complex.

Moreover, the platinum complex represented by the general formula (A) or the general formula (B) is used as a phosphorescent dopant by using the compound represented by the general formula (1) according to the present invention as the host compound of the light emitting layer. If used. The doping amount of the phosphorescent compound with respect to the host compound is preferably more than 0% and less than 30% by weight, more preferably 0.1% by weight to 20% by weight, and particularly preferably 1% by weight to 15%. It is less than mass%.

  The “host compound” used in the present invention is a compound having a phosphorescence quantum yield of phosphorescence emission of less than 0.01 at room temperature (25 ° C.) among compounds contained in the light emitting layer.

The phosphorescence quantum yield can be measured by the method described in Spectroscopic II, page 398 (1992 edition, Maruzen) of the 4th edition, Experimental Chemistry Course 7 .
In the present invention, the platinum complex represented by the general formula (A) or the general formula (B ) is used as a luminescent dopant (also simply referred to as a dopant), but other known phosphorescent compounds may be used in combination. . Specific examples thereof include, but are not limited to, compounds described in the following patent publications.

  WO 00/70655 pamphlet, JP 2002-280178, JP 2001-181616, JP 2002-280179, JP 2001-181617, JP 2002-280180, JP 2001-247859, JP 2002-299060, JP 2001-313178, JP 2002-302671, JP 2001-345183, JP 2002-324679, International Publication No. 02/15645 pamphlet, JP 2002-332291 A, JP 2002-50484 A, JP 2002-332292 A, JP 2002-83684 A, JP 2002-540572 A, JP 2002-2002 A. No. 117978, JP 20 JP-A-2-338588, JP-A-2002-170684, JP-A-2002-352960, WO01 / 93642, JP-A-2002-50483, JP-A-2002-1000047, JP-A-2002. No. -173744, JP-A No. 2002-359082, JP-A No. 2002-175484, JP-A No. 2002-363552, JP-A No. 2002-184582, JP-A No. 2003-7469, JP 2002-525808 A. Gazette, JP2003-7471, JP2002-525833, JP2003-31366, JP2002-226495, JP2002-234894, JP2002-2335076 JP 2002-241751 A JP 2001-319779, JP 2001-319780, JP 2002-62824, JP 2002-1000047, JP 2002-203679, JP 2002-343572, JP 2002-203678 gazette etc.

  Some examples are shown below.

  In addition to a dopant made of a phosphorescent compound, a fluorescent dopant may be added to the light emitting layer. Typical examples of the fluorescent dopant include a coumarin dye, a pyran dye, a cyanine dye, and a croconium. Dyes, squalium dyes, oxobenzanthracene dyes, fluorescein dyes, rhodamine dyes, pyrylium dyes, perylene dyes, stilbene dyes, polythiophene dyes, rare earth complex phosphors, and other known fluorescent compounds Etc.

  In the present invention, the compound represented by the general formula (1) is preferably used as the host compound (light-emitting host), but a known host compound can also be used in combination, and the compound represented by the general formula (1) A known host compound may be used by providing a light emitting layer in addition to the light emitting layer to be contained. Known host compounds are not particularly limited in structure, but typically carbazole derivatives, triarylamine derivatives, aromatic borane derivatives, nitrogen-containing heterocyclic compounds, thiophene derivatives, furan derivatives, oligoarylene compounds, etc. A compound having the following basic skeleton is preferred.

  These host compounds may be low molecular compounds, high molecular compounds having repeating units, or low molecular compounds having a polymerizable group such as a vinyl group or an epoxy group (evaporation polymerizable light emitting host).

  As the host compound, a compound that has a hole transporting ability and an electron transporting ability, prevents the emission of light from being increased in wavelength, and has a high Tg (glass transition temperature) is preferable.

  As specific examples of the host compound (also referred to as a light-emitting host), compounds described in the following documents are suitable. For example, Japanese Patent Application Laid-Open Nos. 2001-257076, 2002-308855, 2001-313179, 2002-319491, 2001-357777, 2002-334786, 2002-8860 Gazette, 2002-334787 gazette, 2002-15871 gazette, 2002-334788 gazette, 2002-43056 gazette, 2002-334789 gazette, 2002-75645 gazette, 2002-338579 gazette. No. 2002-105445, No. 2002-343568, No. 2002-141173, No. 2002-352957, No. 2002-203683, No. 2002-363227, No. 2002-231453. No. 2003-3165, No. 2002-234888, No. 2003-27048, No. 2002-255934, No. 2002-286061, No. 2002-280183, No. 2002-299060. 2002-302516, 2002-305083, 2002-305084, 2002-308837, and the like.

  The dopant may be dispersed throughout the layer containing the host compound or may be partially dispersed.

  Other compounds may be further added to the light emitting layer, and the added compound may be a compound represented by the general formula (1) or another organic compound or complex that emits fluorescence or phosphorescence. It may also be a compound having another function. In addition, a polymer material such as p-polyphenylene vinylene or polyfluorene may be added to the light emitting layer, and the dopant is introduced into a polymer chain, or the dopant is used as a polymer main chain. May be used.

  The light emitting layer can be formed by forming the above compound by a known thinning method such as a vacuum deposition method, a spin coating method, a casting method, an LB method, an ink jet method, a transfer method, or a printing method. Although there is no special restriction | limiting in the film thickness as a light emitting layer, Usually, it selects in 5 nm-5 micrometers. Further, as described in JP-A-57-51781, this light emitting layer is prepared by dissolving the above light emitting material in a solvent together with a binder such as a resin, and then using a spin coating method or the like. It can also be formed as a thin film. There is no restriction | limiting in particular about the film thickness of the light emitting layer formed in this way, Although it can select suitably according to a condition, Usually, it is the range of 5 nm-5 micrometers.

  Taking advantage of the characteristics of the organic EL element that it is thin and can be formed on a resin substrate, a white light-emitting element is constructed considering the case of using it for a panel or other lighting device It is practically useful to do. At present, there is no single light emitting material that exhibits white light emission, and therefore, a plurality of light emitting colors are simultaneously emitted by a plurality of light emitting materials to obtain white light emission by color mixing. A combination of a plurality of emission colors may include three emission maximum wavelengths of three primary colors (blue, green, and red), or two using complementary colors such as blue and yellow, blue green and orange. The thing containing the light emission maximum wavelength may be used. As described above, these mixed colors can be emitted by using a dopant. This can be done by changing the kind and amount of dopant contained in the same light emitting layer, When the light-emitting layer is configured by stacking layers, the color tone of light emitted outside is controlled by changing the type and amount of dopant contained in each layer and causing each layer to emit light in a different color tone. You can also

<Blocking layer: hole blocking layer, electron blocking layer>
As described above, the blocking layer is provided as necessary in addition to the basic constituent layer of the organic compound thin film. For example, as described in JP-A Nos. 11-204258 and 11-204359, and “Organic EL elements and the forefront of industrialization” (issued on November 30, 1998 by NTS Corporation). There is a hole blocking layer.

  The hole blocking layer is an electron transport layer in a broad sense, and is made of a hole blocking material that has a function of transporting electrons but has a very small ability to transport holes, and blocks holes while transporting electrons. Thus, the probability of recombination of electrons and holes can be improved.

  The hole blocking layer of the organic EL device of the present invention is preferably provided adjacent to the light emitting layer. In this invention, it is preferable to contain the compound which concerns on this invention mentioned above as a hole blocking material of a hole blocking layer. Thereby, it can be set as an organic EL element with much higher luminous efficiency. Furthermore, the lifetime can be further increased.

  On the other hand, the electron blocking layer is a hole transport layer in a broad sense, made of a material that has a function of transporting holes and has a very small ability to transport electrons, and blocks electrons while transporting holes. Thus, the probability of recombination of electrons and holes can be improved.

《Hole transport layer》
The hole transport layer is made of a hole transport material having a function of transporting holes, and in a broad sense, a hole injection layer and an electron blocking layer are also included in the hole transport layer. The hole transport layer can be provided as a single layer or a plurality of layers.

  The hole transport material has any one of hole injection or transport and electron barrier properties, and may be either organic or inorganic. For example, triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives and pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbenes Derivatives, silazane derivatives, aniline copolymers, conductive polymer oligomers, particularly thiophene oligomers, and the like can be given.

  As the hole transport material, those described above can be used, but it is preferable to use a porphyrin compound, an aromatic tertiary amine compound and a styrylamine compound, particularly an aromatic tertiary amine compound.

  Representative examples of aromatic tertiary amine compounds and styrylamine compounds include N, N, N ′, N′-tetraphenyl-4,4′-diaminophenyl; N, N′-diphenyl-N, N′— Bis (3-methylphenyl)-[1,1′-biphenyl] -4,4′-diamine (TPD); 2,2-bis (4-di-p-tolylaminophenyl) propane; 1,1-bis (4-di-p-tolylaminophenyl) cyclohexane; N, N, N ′, N′-tetra-p-tolyl-4,4′-diaminobiphenyl; 1,1-bis (4-di-p-tolyl) Aminophenyl) -4-phenylcyclohexane; bis (4-dimethylamino-2-methylphenyl) phenylmethane; bis (4-di-p-tolylaminophenyl) phenylmethane; N, N'-diphenyl-N, N ' − (4-methoxyphenyl) -4,4'-diaminobiphenyl; N, N, N ', N'-tetraphenyl-4,4'-diaminodiphenyl ether; 4,4'-bis (diphenylamino) quadriphenyl; N, N, N-tri (p-tolyl) amine; 4- (di-p-tolylamino) -4 '-[4- (di-p-tolylamino) styryl] stilbene; 4-N, N-diphenylamino- (2-diphenylvinyl) benzene; 3-methoxy-4′-N, N-diphenylaminostilbenzene; N-phenylcarbazole, and two more described in US Pat. No. 5,061,569 Having a condensed aromatic ring of, for example, 4,4'-bis [N- (1-naphthyl) -N-phenylamino] biphenyl (NPD), JP-A-4-3086 4,4 ', 4 "-tris [N- (3-methylphenyl) -N-phenylamino] triphenylamine in which three triphenylamine units described in Japanese Patent No. 8 are linked in a starburst type ( MTDATA) and the like.

  Furthermore, a polymer material in which these materials are introduced into a polymer chain or these materials are used as a polymer main chain can also be used. In addition, inorganic compounds such as p-type-Si and p-type-SiC can also be used as the hole injection material and the hole transport material.

  The hole transport layer can be formed by thinning the hole transport material by a known method such as a vacuum deposition method, a spin coating method, a casting method, a printing method including an ink jet method, or an LB method. it can. Although there is no restriction | limiting in particular about the film thickness of a positive hole transport layer, Usually, 5 nm-about 5 micrometers, Preferably it is 5 nm-200 nm. This hole transport layer may have a single layer structure composed of one or more of the above materials.

《Electron transport layer》
The electron transport layer is made of a material having a function of transporting electrons, and in a broad sense, an electron injection layer and a hole blocking layer are also included in the electron transport layer. The electron transport layer can be provided as a single layer or a plurality of layers.

  Conventionally, in the case of a single electron transport layer and a plurality of layers, an electron transport material (also serving as a hole blocking material) used for an electron transport layer adjacent to the light emitting layer on the cathode side is injected from the cathode. As long as it has a function of transferring electrons to the light-emitting layer, any material can be selected and used from among conventionally known compounds. For example, nitro-substituted fluorene derivatives, diphenylquinone derivatives Thiopyrandioxide derivatives, carbodiimides, fluorenylidenemethane derivatives, anthraquinodimethane and anthrone derivatives, oxadiazole derivatives and the like. Furthermore, in the above oxadiazole derivative, a thiadiazole derivative in which the oxygen atom of the oxadiazole ring is substituted with a sulfur atom, and a quinoxaline derivative having a quinoxaline ring known as an electron withdrawing group can also be used as an electron transport material.

  Furthermore, a polymer material in which these materials are introduced into a polymer chain or these materials are used as a polymer main chain can also be used.

  In addition, metal complexes of 8-quinolinol derivatives such as tris (8-quinolinol) aluminum (Alq), tris (5,7-dichloro-8-quinolinol) aluminum, tris (5,7-dibromo-8-quinolinol) aluminum, Tris (2-methyl-8-quinolinol) aluminum, tris (5-methyl-8-quinolinol) aluminum, bis (8-quinolinol) zinc (Znq), etc., and the central metals of these metal complexes are In, Mg, Cu , Ca, Sn, Ga, or Pb can also be used as an electron transport material. In addition, metal-free or metal phthalocyanine, or those having terminal ends substituted with an alkyl group or a sulfonic acid group can be preferably used as the electron transporting material. In addition, the distyrylpyrazine derivative exemplified as the material of the light emitting layer can also be used as an electron transport material, and similarly to the hole injection layer and the hole transport layer, inorganic such as n-type-Si and n-type-SiC A semiconductor can also be used as an electron transport material.

  The electron transport layer can be formed by thinning the electron transport material by a known method such as a vacuum deposition method, a spin coating method, a casting method, a printing method including an ink jet method, or an LB method. Although there is no restriction | limiting in particular about the film thickness of an electron carrying layer, Usually, 5 nm-about 5 micrometers, Preferably it is 5 nm-200 nm. The electron transport layer may have a single layer structure composed of one or more of the above materials.

"anode"
As the anode in the organic EL element, an electrode material made of a metal, an alloy, an electrically conductive compound, or a mixture thereof having a high work function (4 eV or more) is preferably used. Specific examples of such electrode materials include metals such as Au, and conductive transparent materials such as CuI, indium tin oxide (ITO), SnO ₂ and ZnO. Alternatively, an amorphous material such as IDIXO (In ₂ O ₃ —ZnO) capable of forming a transparent conductive film may be used. For the anode, a thin film may be formed by depositing these electrode materials by a method such as vapor deposition or sputtering, and a pattern having a desired shape may be formed by a photolithography method. Degree), a pattern may be formed through a mask having a desired shape when the electrode material is deposited or sputtered. When light emission is extracted from the anode, it is desirable that the transmittance is greater than 10%, and the sheet resistance as the anode is preferably several hundred Ω / □ or less. Further, although the film thickness depends on the material, it is usually selected in the range of 10 nm to 1000 nm, preferably 10 nm to 200 nm.

"cathode"
On the other hand, as the cathode, a material having a low work function (4 eV or less) metal (referred to as an electron injecting metal), an alloy, an electrically conductive compound, and a mixture thereof as an electrode material is used. Specific examples of such electrode materials include sodium, sodium-potassium alloy, magnesium, lithium, magnesium / copper mixture, magnesium / silver mixture, magnesium / aluminum mixture, magnesium / indium mixture, aluminum / aluminum oxide (Al ₂ O ₃ ) Mixtures, indium, lithium / aluminum mixtures, rare earth metals and the like. Among these, a mixture of an electron injecting metal and a second metal which is a stable metal having a larger work function value than this, such as a magnesium / silver mixture, magnesium, from the viewpoint of electron injectability and durability against oxidation, etc. / Aluminum mixtures, magnesium / indium mixtures, aluminum / aluminum oxide (Al ₂ O ₃ ) mixtures, lithium / aluminum mixtures, aluminum and the like are preferred. The cathode can be produced by forming a thin film of these electrode materials by a method such as vapor deposition or sputtering. The sheet resistance as the cathode is preferably several hundred Ω / □ or less, and the film thickness is usually selected in the range of 10 nm to 5 μm, preferably 50 to 200 nm. In order to transmit the emitted light, if either the anode or the cathode of the organic EL element is transparent or translucent, the light emission luminance is improved, which is convenient.

  Moreover, after producing the said metal with a film thickness of 1-20 nm on a cathode, a transparent or semi-transparent cathode can be produced by producing the electroconductive transparent material quoted by description of the anode on it, By applying this, an element in which both the anode and the cathode are transmissive can be manufactured.

  Next, an injection layer, a blocking layer, an electron transport layer, and the like used as a constituent layer of the organic EL element of the present invention will be described.

<< Injection layer: electron injection layer, hole injection layer >>
The injection layer is provided as necessary, and there are an electron injection layer and a hole injection layer, and as described above, exists between the anode and the light emitting layer or the hole transport layer, and between the cathode and the light emitting layer or the electron transport layer. You may let them.

  An injection layer is a layer provided between an electrode and an organic layer in order to reduce drive voltage and improve light emission luminance. “Organic EL element and its forefront of industrialization (issued by NTT Corporation on November 30, 1998) 2), Chapter 2, “Electrode Materials” (pages 123 to 166) in detail, and includes a hole injection layer (anode buffer layer) and an electron injection layer (cathode buffer layer).

  The details of the anode buffer layer (hole injection layer) are described in JP-A-9-45479, JP-A-9-260062, JP-A-8-288069 and the like. As a specific example, copper phthalocyanine is used. Examples thereof include a phthalocyanine buffer layer represented by an oxide, an oxide buffer layer represented by vanadium oxide, an amorphous carbon buffer layer, and a polymer buffer layer using a conductive polymer such as polyaniline (emeraldine) or polythiophene.

  The details of the cathode buffer layer (electron injection layer) are described in JP-A-6-325871, JP-A-9-17574, JP-A-10-74586, and the like. Specifically, strontium, aluminum, etc. Metal buffer layer typified by lithium, alkali metal compound buffer layer typified by lithium fluoride, alkaline earth metal compound buffer layer typified by magnesium fluoride, oxide buffer layer typified by aluminum oxide, etc. . The buffer layer (injection layer) is desirably a very thin film, and although it depends on the material, the film thickness is preferably in the range of 0.1 nm to 5 μm.

<Substrate>
The organic EL device of the present invention is preferably formed on a substrate.

  The substrate (hereinafter also referred to as a substrate, substrate, support, etc.) that can be used in the organic EL device of the present invention is not particularly limited in the type of glass, plastic, etc. Although there is no restriction | limiting in particular, As a board | substrate used preferably, glass, quartz, and a transparent resin film can be mentioned, for example. A particularly preferable substrate is a resin film that can give flexibility to the organic EL element.

  Examples of the resin film include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polyetherimide, polyetheretherketone, polyphenylene sulfide, polyarylate, polyimide, polycarbonate (PC), and cellulose. Examples include films made of triacetate (TAC), cellulose acetate propionate (CAP), and the like. On the surface of the resin film, an inorganic film, an organic film, or a hybrid film of both may be formed.

  The external extraction efficiency at room temperature for light emission of the organic electroluminescence device of the present invention is preferably 1% or more, more preferably 5% or more. Here, the external extraction quantum efficiency (%) = the number of photons emitted to the outside of the organic EL element / the number of electrons sent to the organic EL element × 100.

  In addition, a hue improvement filter such as a color filter may be used in combination, or a color conversion filter that converts the emission color from the organic EL element into multiple colors using a phosphor. In the case of using a color conversion filter, the λmax of light emission of the organic EL element is preferably 480 nm or less.

<< Method for producing organic EL element >>
As an example of the method for producing the organic EL device of the present invention, a method for producing an organic EL device comprising an anode / hole injection layer / hole transport layer / light emitting layer / hole blocking layer / electron transport layer / cathode will be described.

  First, a thin film made of a desired electrode material, for example, an anode material is formed on a suitable substrate by a method such as vapor deposition or sputtering so as to have a film thickness of 1 μm or less, preferably 10 nm to 200 nm, thereby producing an anode. To do. Next, an organic compound thin film of a hole injection layer, a hole transport layer, a light emitting layer, a hole blocking layer, and an electron transport layer, which are organic EL element materials, is formed thereon.

As a method for thinning the organic compound thin film, there are a vapor deposition method and a wet process (for example, a spin coating method, a casting method, an ink jet method, a printing method) as described above. From the viewpoint of difficulty in generating pinholes, vacuum deposition, spin coating, ink jet, and printing are particularly preferable. Further, a different film forming method may be applied for each layer. When a vapor deposition method is employed for film formation, the vapor deposition conditions vary depending on the type of compound used, but generally a boat heating temperature of 50 ° C. to 450 ° C., a vacuum degree of 10 ⁻⁶ to 10 ⁻² Pa, a vapor deposition rate of 0. It is desirable to select appropriately within the range of 01 nm / second to 50 nm / second, substrate temperature −50 ° C. to 300 ° C., film thickness 0.1 nm to 5 μm, preferably 5 nm to 200 nm.

  After these layers are formed, a thin film made of a cathode material is formed thereon by a method such as vapor deposition or sputtering so as to have a thickness of 1 μm or less, preferably in the range of 50 to 200 nm, and a cathode is provided. Thus, a desired organic EL element can be obtained. The organic EL element is preferably produced from the hole injection layer to the cathode consistently by a single evacuation, but may be taken out halfway and subjected to different film forming methods. At that time, it is necessary to consider that the work is performed in a dry inert gas atmosphere.

  The multi-color display device of the present invention is provided with a shadow mask only at the time of forming a light emitting layer, and other layers are common, so patterning such as a shadow mask is unnecessary, and vapor deposition, casting, spin coating, inkjet A film can be formed by a method or a printing method.

  When patterning is performed only on the light emitting layer, the method is not limited. However, a vapor deposition method, an inkjet method, and a printing method are preferable. In the case of using a vapor deposition method, patterning using a shadow mask is preferable.

  Further, it is also possible to reverse the production order and produce the cathode, the electron transport layer, the hole blocking layer, the light emitting layer, the hole transport layer, the hole injection layer, and the anode in this order. When a DC voltage is applied to the multicolor display device thus obtained, light emission can be observed by applying a voltage of about 2 to 40 V with the positive polarity of the anode and the negative polarity of the cathode. An alternating voltage may be applied. The alternating current waveform to be applied may be arbitrary.

  The display device of the present invention can be used as a display device, a display, and various light emission sources. In a display device or a display, full-color display is possible by using three types of organic EL elements of blue, red, and green light emission.

  Examples of the display device and display include a television, a personal computer, a mobile device, an AV device, a character broadcast display, and an information display in an automobile. In particular, it may be used as a display device for reproducing still images and moving images, and the driving method when used as a display device for reproducing moving images may be either a simple matrix (passive matrix) method or an active matrix method.

  Illumination devices include home lighting, interior lighting, clock and liquid crystal backlights, billboard advertisements, traffic lights, light sources for optical storage media, light sources for electrophotographic copying machines, light sources for optical communication processors, light sources for optical sensors, etc. However, it is not limited to these. Moreover, you may use as an organic EL element which gave the organic EL element of this invention the resonator structure.

  Examples of the purpose of use of the organic EL element having such a resonator structure include a light source of an optical storage medium, a light source of an electrophotographic copying machine, a light source of an optical communication processing machine, and a light source of an optical sensor. It is not limited. Moreover, you may use for the said use by making a laser oscillation.

  The organic EL material used in the present invention can be applied to an organic EL element that emits substantially white light as a lighting device. A plurality of light emitting colors are simultaneously emitted by a plurality of light emitting materials to obtain white light emission by color mixing. As a combination of a plurality of luminescent colors, those containing three luminescence maximum wavelengths of three primary colors of blue, green, and blue may be used. The thing containing the light emission maximum wavelength may be used.

  In addition, a combination of light emitting materials for obtaining a plurality of emission colors is a combination of a plurality of phosphorescent or fluorescent materials that emit light, and a light emitting material that emits fluorescence or phosphorescence, and light from the light emitting material Any combination with a dye material that emits light as excitation light may be used. However, in the white organic electroluminescence device according to the present invention, it is only necessary to mix and combine a plurality of light-emitting dopants. It is only necessary to provide a mask only when forming a light emitting layer, a hole transport layer, an electron transport layer, or the like, and simply arrange them separately by the mask. Since other layers are common, patterning of the mask or the like is not necessary. In addition, for example, an electrode film can be formed by a vapor deposition method, a cast method, a spin coating method, an ink jet method, a printing method, or the like, and productivity is also improved. According to this method, unlike a white organic EL device in which light emitting elements of a plurality of colors are arranged in parallel in an array, the elements themselves are luminescent white.

  There is no restriction | limiting in particular as a luminescent material used for a light emitting layer, For example, if it is a backlight in a liquid crystal display element, an ortho metalated complex (Ir complex, so that it may suit the wavelength range corresponding to CF (color filter) characteristic) Pt complex etc.) or any known light emitting material may be selected and combined to whiten.

  Thus, the white light-emitting organic EL device according to the present invention, as well as the display device and display, as various light-emitting light sources and lighting devices, as a kind of lamp such as household lighting, interior lighting, and exposure light source, It is also useful for display devices such as backlights for liquid crystal display devices.

  Others such as backlights for watches, signboard advertisements, traffic lights, light sources for optical storage media, light sources for electrophotographic copying machines, light sources for optical communication processors, light sources for optical sensors, etc. There are a wide range of uses such as household appliances.

<Display device>
The organic EL element of the present invention may be used as one kind of lamp for illumination or exposure light source, a projection device for projecting an image, or a display for directly viewing a still image or a moving image. It may be used as a device (display). When used as a display device for reproducing moving images, the driving method may be either a simple matrix (passive matrix) method or an active matrix method. Alternatively, a full-color display device can be manufactured by using three or more organic EL elements of the present invention having different emission colors. Alternatively, it is possible to make a single color emission color, for example, white emission, into BGR using a color filter to achieve full color. Furthermore, it is possible to convert the emission color of the organic EL to another color by using a color conversion filter, and in this case, λmax of the organic EL emission is preferably 480 nm or less.

  An example of a display device composed of the organic EL element of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic diagram illustrating an example of a display device including organic EL elements. It is a schematic diagram of a display such as a mobile phone that displays image information by light emission of an organic EL element.

  The display 1 includes a display unit A having a plurality of pixels, a control unit B that performs image scanning of the display unit A based on image information, and the like.

  The control unit B is electrically connected to the display unit A, and sends a scanning signal and an image data signal to each of the plurality of pixels based on image information from the outside. The pixels for each scanning line are converted into image data signals by the scanning signal. In response to this, light is sequentially emitted and image scanning is performed to display image information on the display unit A.

  FIG. 2 is a schematic diagram of the display unit A.

  The display unit A includes a wiring unit including a plurality of scanning lines 5 and data lines 6, a plurality of pixels 3 and the like on a substrate. The main members of the display unit A will be described below. FIG. 2 shows a case where the light emitted from the pixel 3 is extracted in the direction of the white arrow (downward).

  The scanning lines 5 and the plurality of data lines 6 in the wiring portion are each made of a conductive material, and the scanning lines 5 and the data lines 6 are orthogonal to each other in a grid pattern and are connected to the pixels 3 at orthogonal positions (details are shown in FIG. Not shown).

  When a scanning signal is applied from the scanning line 5, the pixel 3 receives an image data signal from the data line 6 and emits light according to the received image data. Full color display is possible by appropriately arranging pixels in the red region, the green region, and the blue region that emit light on the same substrate.

  Next, the light emission process of the pixel will be described.

  FIG. 3 is a schematic diagram of a pixel.

  The pixel includes an organic EL element 10, a switching transistor 11, a driving transistor 12, a capacitor 13, and the like. A full color display can be performed by using red, green, and blue light emitting organic EL elements as the organic EL elements 10 in a plurality of pixels, and juxtaposing them on the same substrate.

  In FIG. 3, an image data signal is applied from the control unit B to the drain of the switching transistor 11 through the data line 6. When a scanning signal is applied from the control unit B to the gate of the switching transistor 11 via the scanning line 5, the driving of the switching transistor 11 is turned on, and the image data signal applied to the drain is supplied to the capacitor 13 and the driving transistor 12. Is transmitted to the gate.

  By transmitting the image data signal, the capacitor 13 is charged according to the potential of the image data signal, and the drive of the drive transistor 12 is turned on. The drive transistor 12 has a drain connected to the power supply line 7 and a source connected to the electrode of the organic EL element 10, and the power supply line 7 connects to the organic EL element 10 according to the potential of the image data signal applied to the gate. Current is supplied.

  When the scanning signal is moved to the next scanning line 5 by the sequential scanning of the control unit B, the driving of the switching transistor 11 is turned off. However, even if the driving of the switching transistor 11 is turned off, the capacitor 13 maintains the potential of the charged image data signal, so that the driving of the driving transistor 12 is kept on and the next scanning signal is applied. Until then, the light emission of the organic EL element 10 continues. When the scanning signal is next applied by sequential scanning, the driving transistor 12 is driven according to the potential of the next image data signal synchronized with the scanning signal, and the organic EL element 10 emits light.

  That is, the organic EL element 10 emits light by the switching transistor 11 and the driving transistor 12 that are active elements for the organic EL elements 10 of the plurality of pixels, and the organic EL elements 10 of the plurality of pixels 3 emit light. It is carried out. Such a light emitting method is called an active matrix method.

  Here, the light emission of the organic EL element 10 may be light emission of a plurality of gradations by a multi-value image data signal having a plurality of gradation potentials, or on / off of a predetermined light emission amount by a binary image data signal. But you can.

  The potential of the capacitor 13 may be held continuously until the next scanning signal is applied, or may be discharged immediately before the next scanning signal is applied.

  In the present invention, not only the active matrix method described above, but also a passive matrix light emission drive in which the organic EL element emits light according to the data signal only when the scanning signal is scanned.

  FIG. 4 is a schematic view of a passive matrix display device. In FIG. 4, a plurality of scanning lines 5 and a plurality of image data lines 6 are provided in a lattice shape so as to face each other with the pixel 3 interposed therebetween.

  When the scanning signal of the scanning line 5 is applied by sequential scanning, the pixels 3 connected to the applied scanning line 5 emit light according to the image data signal. In the passive matrix system, the pixel 3 has no active element, and the manufacturing cost can be reduced.

  The organic EL material according to the present invention can also be applied to an organic EL element that emits substantially white light as a lighting device. A plurality of light emitting colors are simultaneously emitted by a plurality of light emitting materials to obtain white light emission by color mixing. As a combination of a plurality of luminescent colors, those containing three luminescence maximum wavelengths of three primary colors of blue, green, and blue may be used. The thing containing the light emission maximum wavelength may be used.

  In addition, a combination of light emitting materials for obtaining a plurality of emission colors includes a combination of a plurality of phosphorescent or fluorescent materials (light emitting dopants), a light emitting material that emits fluorescent or phosphorescent light, and the light emission. Any combination of a dye material that emits light from the material as excitation light may be used, but in the white organic electroluminescence device according to the present invention, a method of combining a plurality of light-emitting dopants is preferable.

  As a layer structure of an organic electroluminescence device for obtaining a plurality of emission colors, a method of having a plurality of emission dopants in one emission layer, a plurality of emission layers, and an emission wavelength in each emission layer And a method of forming minute pixels emitting light having different wavelengths in a matrix.

  In the white organic electroluminescence device according to the present invention, patterning may be performed by a metal mask, an ink jet printing method, or the like at the time of film formation, if necessary. When patterning, only the electrode may be patterned, the electrode and the light emitting layer may be patterned, or the entire element layer may be patterned.

  The light emitting material used for the light emitting layer is not particularly limited. For example, in the case of a backlight in a liquid crystal display element, the platinum complex according to the present invention is known so as to be suitable for the wavelength range corresponding to the CF (color filter) characteristics. Any one of the light emitting materials may be selected and combined to be whitened.

  Thus, in addition to the display device and display, the white light-emitting organic EL element of the present invention can be used as various light sources, lighting devices, household lighting, interior lighting, and a kind of lamp such as an exposure light source. It is also useful for display devices such as backlights for liquid crystal display devices.

  Others such as backlights for watches, signboard advertisements, traffic lights, light sources for optical storage media, light sources for electrophotographic copying machines, light sources for optical communication processors, light sources for optical sensors, etc. There are a wide range of uses such as household appliances.

  EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to these. Moreover, the compound used for an Example is shown below.

Example 1
<< Production of Organic EL Element OLED1-1 >>
After patterning on a substrate (made by NH Techno Glass Co., Ltd .: NA-45) having a 150 nm ITO film formed on glass as an anode, the transparent support substrate provided with this ITO transparent electrode was ultrasonically cleaned with iso-propyl alcohol. Then, it was dried with dry nitrogen gas, and UV ozone cleaning was performed for 5 minutes. The transparent support substrate is fixed to a substrate holder of a commercially available vacuum deposition apparatus, while α-NPD, CBP, Ir-1, BCP, and Alq ₃ are placed in five tantalum resistance heating boats, respectively. It was attached to the (first vacuum chamber).

  Further, lithium fluoride was placed in a resistance heating boat made of tantalum, and aluminum was placed in a resistance heating boat made of tungsten, and attached to the second vacuum tank of the vacuum evaporation apparatus.

First, after reducing the pressure in the first vacuum tank to 4 × 10 ⁻⁴ Pa, the heating boat containing α-NPD is energized and heated, and transparent at a deposition rate of 0.1 nm / second to 0.2 nm / second. It vapor-deposited so that it might become a film thickness of 25 nm on the support substrate, and provided the positive hole injection / transport layer.

  Further, the heating boat containing CBP and the boat containing Ir-1 are energized independently to adjust the deposition rate of CBP as a light emitting host and Ir-1 as a light emitting dopant to 100: 7. A light emitting layer was provided by vapor deposition so as to have a thickness of 30 nm.

Then, the heating boat containing BCP was energized and heated to provide a 10 nm thick hole blocking layer at a deposition rate of 0.1 m / sec to 0.2 nm / sec. Further, the heating boat containing Alq ₃ was heated by energization to provide an electron transport layer having a film thickness of 40 nm at a deposition rate of 0.1 nm / second to 0.2 nm / second.

  Next, after the element formed up to the electron transport layer as described above is transferred to the second vacuum chamber in a vacuum state, a stainless steel rectangular perforated mask is disposed on the electron transport layer from the outside of the apparatus. Installed with remote control.

After reducing the pressure in the second vacuum chamber to 2 × 10 ⁻⁴ Pa, a cathode buffer layer having a film thickness of 0.5 nm was formed at a deposition rate of 0.01 nm / second to 0.02 nm / second by energizing a boat containing lithium fluoride. Then, a boat containing aluminum was energized to attach a cathode having a film thickness of 150 nm at a deposition rate of 1 nm / second to 2 nm / second. Further, the organic EL element was transferred to a glove box under nitrogen atmosphere (a glove box substituted with high-purity nitrogen gas with a purity of 99.999% or more) without being brought into contact with the atmosphere, and the interior as shown in FIG. An organic EL element OLED1-1 was produced with a substituted sealing structure.

  In addition, barium oxide 105 which is a water trapping agent is a glass-sealed can 104 made of high-purity barium oxide powder manufactured by Aldrich with a fluororesin-based semipermeable membrane (Microtex S-NTF8031Q made by Nitto Denko) with an adhesive. The material pasted on was prepared and used in advance. An ultraviolet curable adhesive 107 was used for bonding the sealing can and the organic EL element, and both were bonded to each other by irradiation with an ultraviolet lamp to produce a sealing element.

  In FIG. 5, 101 is a glass substrate provided with a transparent electrode, 102 is an organic EL layer composed of the hole injection / transport layer, light emitting layer, hole blocking layer, electron transport layer, and the like, and 103 is a cathode.

<< Production of Organic EL Elements OLED1-2 to 1-15 >>
In preparation of said organic EL element OLED1-1, as described in Table 1, except having changed each of the light emission host, the light emission dopant, and the hole-blocking material, it carries out similarly and organic EL element OLED1-2-1-15. Was made.

  The following evaluation was performed about obtained organic EL element OLED1-1 to 1-15.

<< External quantum efficiency >>
The organic EL elements OLED1-1 to 1-15 are lit at room temperature (about 23 ° C. to 25 ° C.) under a constant current condition of ^2.5 mA / cm ² , and light emission luminance (L) [cd / m immediately after the start of lighting] ² ] was measured to calculate the external extraction quantum efficiency (η). Here, CS-1000 (manufactured by Minolta) was used for measurement of light emission luminance.

  The external extraction quantum efficiency was expressed as a relative value when the organic EL element OLED1-1 was set to 100.

<Luminescent life>
At room temperature the organic EL element OLED1-1～1-15, performs continuous lighting by constant current condition of 2.5 mA / cm ^2, the time required to becomes half of the initial luminance (τ _1/2) It was measured. Moreover, the light emission lifetime was represented by the relative value when the organic EL element OLED1-1 was set to 100.

  The obtained results are shown in Table 1.

  From Table 1, the organic EL element produced by using together the platinum complex which concerns on this invention, and the compound represented by General formula (1) for a light emitting layer has high luminous efficiency and luminous lifetime compared with a comparative organic EL element. It is clear that a long life can be achieved.

  Moreover, the improvement of the effect as described in this invention was seen by using the compound represented by General formula (1) for a hole-blocking layer.

Example 2
<< Production of Organic EL Element OLED2-1 >>
After patterning on a substrate (made by NH Techno Glass Co., Ltd .: NA-45) having a 150 nm ITO film formed on glass as an anode, the transparent support substrate provided with this ITO transparent electrode was ultrasonically cleaned with iso-propyl alcohol. Then, it was dried with dry nitrogen gas, and UV ozone cleaning was performed for 5 minutes.

The transparent support substrate is fixed to a substrate holder of a commercially available vacuum deposition apparatus, while α-NPD, CBP, Ir-9, BCP, and Alq ₃ are placed in five tantalum resistance heating boats, respectively. It was attached to the (first vacuum chamber).

  Further, lithium fluoride was placed in a resistance heating boat made of tantalum, and aluminum was placed in a resistance heating boat made of tungsten, and attached to the second vacuum tank of the vacuum evaporation apparatus.

First, after reducing the pressure in the first vacuum tank to 4 × 10 ⁻⁴ Pa, the heating boat containing α-NPD is energized and heated, and transparent at a deposition rate of 0.1 nm / second to 0.2 nm / second. It vapor-deposited so that it might become a film thickness of 30 nm on the support substrate, and provided the positive hole injection / transport layer.

  Further, the heating boat containing CBP and the boat containing Ir-9 are energized independently to adjust the deposition rate of CBP as the light emitting host and Ir-9 as the light emitting dopant to 100: 7. A light emitting layer was provided by vapor deposition so as to have a thickness of 30 nm.

Then, the heating boat containing BCP was energized and heated to provide a 10 nm thick hole blocking layer at a deposition rate of 0.1 nm / sec to 0.2 nm / sec. Further, the heating boat containing Alq ₃ was heated by energization to provide an electron transport layer having a film thickness of 30 nm at a deposition rate of 0.1 nm / second to 0.2 nm / second.

  Next, after the element formed up to the electron transport layer as described above is transferred to the second vacuum chamber in a vacuum state, a stainless steel rectangular perforated mask is disposed on the electron transport layer from the outside of the apparatus. Installed with remote control.

After reducing the pressure in the second vacuum chamber to 2 × 10 ⁻⁴ Pa, a cathode buffer layer having a film thickness of 0.5 nm was formed at a deposition rate of 0.01 nm / second to 0.02 nm / second by energizing a boat containing lithium fluoride. Then, a boat containing aluminum was energized to attach a cathode having a film thickness of 150 nm at a deposition rate of 1 to 2 nm / second. Further, the organic EL element was transferred to a glove box under nitrogen atmosphere (a glove box substituted with high-purity nitrogen gas with a purity of 99.999% or more) without being brought into contact with the atmosphere, and the interior as shown in FIG. An organic EL element OLED1-1 was produced with a substituted sealing structure. In addition, barium oxide 105 which is a water trapping agent is a glass-sealed can 104 made of high-purity barium oxide powder manufactured by Aldrich with a fluororesin-based semipermeable membrane (Microtex S-NTF8031Q made by Nitto Denko) with an adhesive. The material pasted on was prepared and used in advance. An ultraviolet curable adhesive 107 was used for bonding the sealing can and the organic EL element, and both were bonded to each other by irradiation with an ultraviolet lamp to produce a sealing element. In FIG. 5, 101 is a glass substrate provided with a transparent electrode, 102 is an organic EL layer composed of the hole injection / transport layer, light emitting layer, hole blocking layer, electron transport layer, and the like, and 103 is a cathode.

<< Production of Organic EL Elements OLED2-2 to 2-23 >>
In preparation of said organic EL element OLED2-1, as described in Table 1, except having changed the light emission dopant, it carried out similarly and produced organic EL element OLED2-2-2-23.

  About the obtained organic EL element OLED2-1 to 2-23, it evaluated by the method similar to Example 1 about external extraction quantum efficiency.

<Luminescent life>
At room temperature the organic EL element OLED2-1~2-23, 2.5mA / cm ² of make continuous lighting by constant current conditions, the time required to become 90% of the initial luminance (τ _1/9) Was measured. The external extraction quantum efficiency was expressed as a relative value when the organic EL element OLED2-1 was 100, and the emission lifetime was expressed as a relative value when the organic EL element OLED2-1 was 100.

  The obtained results are shown in Table 2.

  The organic EL device produced by using the platinum complex according to the present invention and the compound represented by the general formula (1) in the light emitting layer has higher light emission efficiency and longer light emission lifetime than the comparative organic EL device. Clearly it can be achieved.

  Moreover, the improvement of the effect as described in this invention was seen by using the compound of General formula (1) for a hole-blocking layer.

Example 3
<< Preparation of organic EL element OLED3-1 >>
After patterning on a substrate (made by NH Techno Glass Co., Ltd .: NA-45) having a 150 nm ITO film formed on glass as an anode, the transparent support substrate provided with this ITO transparent electrode was ultrasonically cleaned with iso-propyl alcohol. Then, it was dried with dry nitrogen gas, and UV ozone cleaning was performed for 5 minutes.

The transparent support substrate is fixed to a substrate holder of a commercially available vacuum deposition apparatus, while m-MTDATXA, H1, Ir-12, BCP, and Alq ₃ are placed in five tantalum resistance heating boats, respectively. It was attached to the (first vacuum chamber).

  Further, lithium fluoride was placed in a resistance heating boat made of tantalum, and aluminum was placed in a resistance heating boat made of tungsten, and attached to the second vacuum tank of the vacuum evaporation apparatus.

First, after reducing the pressure of the first vacuum tank to 4 × 10 ⁻⁴ Pa, the heating boat containing m-MTDATXA was energized and heated, and transparent at a deposition rate of 0.1 nm / sec to 0.2 nm / sec. It vapor-deposited so that it might become a film thickness of 40 nm in the support substrate, and provided the positive hole injection / transport layer.

  Further, the heating boat containing H1 and the boat containing Ir-12 are energized independently to adjust the deposition rate of H1 as a light emitting host and Ir-12 as a light emitting dopant to 100: 7. A light emitting layer was provided by vapor deposition so as to have a thickness of 30 nm.

Subsequently, the heating boat containing BCP was energized and heated to provide a hole blocking layer having a thickness of 10 nm at a deposition rate of 0.1 to 0.2 nm / second. Further, the heating boat containing Alq ₃ was heated by energization to provide an electron transport layer having a film thickness of 20 nm at a deposition rate of 0.1 nm / second to 0.2 nm / second.

  Next, after the element formed up to the electron transport layer as described above is transferred to the second vacuum chamber in a vacuum state, a stainless steel rectangular perforated mask is disposed on the electron transport layer from the outside of the apparatus. Installed with remote control.

After reducing the pressure in the second vacuum chamber to 2 × 10 ⁻⁴ Pa, a cathode buffer layer having a film thickness of 0.5 nm was formed at a deposition rate of 0.01 nm / second to 0.02 nm / second by energizing a boat containing lithium fluoride. Then, a boat containing aluminum was energized to attach a cathode having a film thickness of 150 nm at a deposition rate of 1 nm / second to 2 nm / second. Further, the organic EL element was transferred to a glove box under nitrogen atmosphere (a glove box substituted with high-purity nitrogen gas with a purity of 99.999% or more) without being brought into contact with the atmosphere, and the interior as shown in FIG. An organic EL element OLED3-1 was produced with a substituted sealing structure. In addition, barium oxide 105 which is a water trapping agent is a glass-sealed can 104 made of high-purity barium oxide powder manufactured by Aldrich with a fluororesin-based semipermeable membrane (Microtex S-NTF8031Q made by Nitto Denko) with an adhesive. The material pasted on was prepared and used in advance. An ultraviolet curable adhesive 107 was used for bonding the sealing can and the organic EL element, and both were bonded to each other by irradiation with an ultraviolet lamp to produce a sealing element. In FIG. 5, 101 is a glass substrate provided with a transparent electrode, 102 is an organic EL layer composed of the hole injection / transport layer, light emitting layer, hole blocking layer, electron transport layer, and the like, and 103 is a cathode.

<< Preparation of Organic EL Element OLED3-2-3-16 >>
In preparation of said organic EL element OLED3-1, as shown in Table 3, except having changed the light emission dopant, organic EL element OLED3-2-3-16 was produced similarly.

  About the obtained organic EL element OLED3-1 to 3-16, it evaluated by the method similar to Example 1 about external extraction quantum efficiency.

《Voltage increase》
The organic EL elements OLED3-1 to 3-16 are continuously lit at a constant current of ^2.5 mA / cm ² at room temperature, and the driving voltage at the initial stage is the driving voltage when the luminance becomes half of the initial luminance. The rise from was measured.

  Note that the external extraction quantum efficiency and voltage increase are expressed as relative values when the organic EL element OLED3-1 is set to 100.

  The obtained results are shown in Table 3.

  From Table 3, the organic EL element produced by using together the platinum complex which concerns on this invention, and the compound represented by General formula (1) for a light emitting layer has high luminous efficiency and low compared with a comparative organic EL element. It is clear that a voltage increase can be achieved.

  Further, by using the compound of the general formula (1) in the hole blocking layer, the effect described in the present invention was further improved.

Example 4
<Production of full-color display device>
(Production of blue light emitting element)
The organic EL element OLED3-4 of Example 1 was used as a blue light emitting element.

(Production of green light emitting element)
The organic EL element OLED-1-13 of Example 1 was used as a green light emitting element.

(Production of red light emitting element)
The organic EL element OLED2-9 of Example 2 was used as a red light emitting element.

  Each of the red, green, and blue light emitting organic EL elements produced above was juxtaposed on the same substrate to produce an active matrix type full color display device having the form as shown in FIG. 1, and FIG. Only the schematic diagram of the display section A of the display device is shown. That is, a wiring portion including a plurality of scanning lines 5 and data lines 6 on the same substrate, and a plurality of juxtaposed pixels 3 (light emission color is a red region pixel, a green region pixel, a blue region pixel, etc.) The scanning lines 5 and the plurality of data lines 6 in the wiring portion are each made of a conductive material, and the scanning lines 5 and the data lines 6 are orthogonal to each other in a lattice shape and are connected to the pixels 3 at the orthogonal positions ( Details are not shown). The plurality of pixels 3 are driven by an active matrix system provided with an organic EL element corresponding to each emission color, a switching transistor as an active element, and a driving transistor, and a scanning signal is applied from a scanning line 5. Then, an image data signal is received from the data line 6 and light is emitted according to the received image data. In this way, a full color display device was produced by appropriately juxtaposing the red, green, and blue pixels.

  It has been found that by driving the full-color display device, a clear full-color moving image display having high luminance, high durability, and clearness can be obtained.

Example 5
<< Preparation of white light emitting element and white lighting device >>
The electrode of the transparent electrode substrate of Example 1 was patterned to 20 mm × 20 mm, and α-NPD was formed as a hole injecting / transporting layer with a thickness of 25 nm thereon as in Example 1. Further, Compound 74 The heating boat containing the compound 1-3, the boat containing the compound 1-3 and the boat containing the compound 2-10 are energized independently to contain the compound 74 which is a light emitting host and the compound 1-3 which is a light emitting dopant. The evaporation rate of the boat and the compound 2-10 was adjusted so as to be 100: 5: 0.6, and the light emitting layer was provided so as to have a thickness of 30 nm.

Next, a hole blocking layer was provided by depositing BCP to a thickness of 10 nm. Furthermore, Alq ₃ was deposited at 40 nm to provide an electron transport layer.

  Next, as in Example 1, a square perforated mask having the same shape as the transparent electrode made of stainless steel was placed on the electron transport layer, lithium fluoride 0.5 nm as the cathode buffer layer, and aluminum 150 nm as the cathode. Was deposited.

  This element was provided with a sealing can having the same method and the same structure as in Example 1 to produce a flat lamp. FIG. 6 shows a schematic diagram of a flat lamp. FIG. 6A shows a schematic plan view, and FIG. 6B shows a schematic cross-sectional view.

  When this flat lamp was energized, almost white light was obtained, and it was found that it could be used as a lighting device.

It is the schematic diagram which showed an example of the display apparatus comprised from an organic EL element. 4 is a schematic diagram of a display unit A. FIG. It is an equivalent circuit diagram of the drive circuit which comprises a pixel. It is a schematic diagram of the display apparatus by a passive matrix system. It is a schematic diagram of the sealing structure of organic EL element OLED1-1. It is a schematic diagram of the illuminating device which comprises an organic EL element.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display 3 Pixel 5 Scan line 6 Data line 7 Power supply line 10 Organic EL element 11 Switching transistor 12 Drive transistor 13 Capacitor A Display part B Control part 101 Glass substrate with a transparent electrode 102 Organic EL layer 103 Cathode 104 Glass sealing can 105 Barium oxide (water trapping agent)
106 Nitrogen gas 107 UV curable adhesive

Claims (16)

An organic electroluminescence device comprising a platinum complex represented by the following general formula (A) and a compound represented by the following general formula (1) in a hole blocking layer.

[Wherein Z ₁₁ represents an atomic group necessary for forming a benzene ring or a pyridine ring. R ₁₁ represents a substituent, and X ₁₁ represents an oxygen atom, a sulfur atom, or —N (R ₁₂ ) — (R ₁₂ represents a hydrogen atom or a substituent). n11 represents the integer of 0-2. ]

Wherein, Z ₁ represents a pyridine ring, Z ₂ represents a benzene ring or a pyridine ring, Z ₃ represents a single composed bond. R ₁₀₁ represents a hydrogen atom or a substituent. ] An organic electroluminescence device comprising the platinum complex represented by the following general formula (B) and the compound represented by the general formula (1) according to claim 1 in a hole blocking layer.

[Wherein Z ₂₁ represents an atomic group necessary for forming a pyridine ring. R ₂₁ represents a substituent, and X ₂₁ represents an oxygen atom, a sulfur atom, or —N (R ₂₂ ) — (R ₂₂ represents a hydrogen atom or a substituent). n21 represents an integer of 0 to 2. ] The organic electroluminescence device according to claim 1 or 2, wherein the compound represented by the general formula (1) is represented by the following general formula (1-1).

[In the formula, R ₅₀₁ ~ R ₅₀₇ Each independently represents a hydrogen atom or a substituent. ] The organic electroluminescent device according to claim 1 or 2, wherein the compound represented by the general formula (1) is represented by the following general formula (1-2).

[In the formula, R ₅₁₁ ~ R ₅₁₇ Each independently represents a hydrogen atom or a substituent. ] The organic electroluminescent device according to claim 1 or 2, wherein the compound represented by the general formula (1) is represented by the following general formula (1-3).

[In the formula, R ₅₂₁ ~ R ₅₂₇ Each independently represents a hydrogen atom or a substituent. ] The organic electroluminescence device according to claim 1 or 2, wherein the compound represented by the general formula (1) is represented by the following general formula (1-4).

[In the formula, R ₅₃₁ ~ R ₅₃₇ Each independently represents a hydrogen atom or a substituent. ] The organic electroluminescent device according to claim 1 or 2, wherein the compound represented by the general formula (1) is represented by the following general formula (1-5).

[In the formula, R ₅₄₁ ~ R ₅₄₈ Each independently represents a hydrogen atom or a substituent. ] The organic electroluminescent device according to claim 1 or 2, wherein the compound represented by the general formula (1) is represented by the following general formula (1-6).

[In the formula, R ₅₅₁ ~ R ₅₅₈ Each independently represents a hydrogen atom or a substituent. ] The organic electroluminescent device according to claim 1 or 2, wherein the compound represented by the general formula (1) is represented by the following general formula (1-7).

[In the formula, R ₅₆₁ ~ R ₅₆₇ Each independently represents a hydrogen atom or a substituent. ] The organic electroluminescent device according to claim 1 or 2, wherein the compound represented by the general formula (1) is represented by the following general formula (1-8).

[In the formula, R ₅₇₁ ~ R ₅₇₇ Each independently represents a hydrogen atom or a substituent. ] The organic electroluminescent device according to claim 1 or 2, wherein the compound represented by the general formula (1) is represented by the following general formula (1-9).

[Wherein, R represents a hydrogen atom or a substituent. The plurality of R may be the same or different. ] The organic electroluminescent device according to claim 1 or 2, wherein the compound represented by the general formula (1) is represented by the following general formula (1-10).

[Wherein, R represents a hydrogen atom or a substituent. The plurality of R may be the same or different. ] The compound represented by the general formula (1) has at least one group represented by any one of the following general formulas (2-1) to (2-8). The organic electroluminescent element of description.

[In the formula, R ₅₀₂ ~ R ₅₀₇ , R ₅₁₂ ~ R ₅₁₇ , R ₅₂₂ ~ R ₅₂₇ , R ₅₃₂ ~ R ₅₃₇ , R ₅₄₂ ~ R ₅₄₈ , R ₅₅₂ ~ R ₅₅₈ , R ₅₆₂ ~ R ₅₆₇ , R ₅₇₂ ~ R ₅₇₇ Each independently represents a hydrogen atom or a substituent, and the substituents may be the same or different. ] It has a phosphorescent light emitting layer as a structure layer, This phosphorescent light emitting layer contains the compound represented by the said General formula (1), The any one of Claims 1-13 characterized by the above-mentioned. Organic electroluminescence device. A display device comprising the organic electroluminescence element according to claim 1. It has an organic electroluminescent element of any one of Claims 1-14, The illuminating device characterized by the above-mentioned.

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