JP2007227431A - Organic electroluminescence device, display device and lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic electroluminescence device which exhibits appropriate light emission luminance and service life, has less dark spot during driving and is high in aging stability under high temperature and high moisture, and to provide a display device and a lighting device using the same. <P>SOLUTION: The organic electroluminescence device is provided with an electrode and at least two layers of an organic layer on a substrate. At least one layer of the organic layers is a light emitting layer containing a phosphorescence compound, whose HOMO is -5.15 to -3.50 eV and LUMO is -1.25 to +1.00 eV. Furthermore, at least one layer of the organic layers is formed by transfer or lamination. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an organic electroluminescence element, a display device using the organic electroluminescence element, and an illumination apparatus.

  Conventionally, there is an electroluminescence display (ELD) as a light-emitting electronic display device. 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.

  On the other hand, an organic EL device has a structure in which a light-emitting layer containing a light-emitting compound is sandwiched between a cathode and an anode, and excitons (excitons) are generated by injecting electrons and holes into the light-emitting layer and recombining them. The device emits light by utilizing the emission of light (fluorescence / phosphorescence) when the exciton is deactivated, and can emit light at a voltage of several volts to several tens of volts. Therefore, it has a wide viewing angle, high visibility, and since it is a thin-film type completely solid element, it has attracted attention from the viewpoints of space saving and portability.

  For the development of organic EL elements for practical use in the future, organic EL elements that emit light efficiently and with high luminance with lower power consumption are desired. For example, stilbene derivatives, distyrylarylene derivatives or A technique for doping a trisstyrylarylene derivative with a small amount of a phosphor to improve emission luminance and extend the lifetime of the device (see, for example, Patent Document 1), and using 8-hydroxyquinoline aluminum complex as a host compound. A device having an organic light emitting layer doped with a trace amount of a phosphor (see, for example, Patent Document 2), a device having an organic light emitting layer doped with a quinacridone dye as a host compound using 8-hydroxyquinoline aluminum complex ( For example, see Patent Document 3).

  In the technique disclosed in the above-mentioned patent document, when the emission from the excited singlet is used, the generation ratio of the singlet exciton and the triplet exciton is 1: 3, so the generation probability of the luminescent excited species is 25%. Since the light extraction efficiency is about 20%, the limit of the external extraction quantum efficiency (ηext) is set to 5%.

  However, since Princeton University has reported on organic EL devices that use phosphorescence emission from excited triplets (see, for example, Non-Patent Document 1), research on materials that exhibit phosphorescence at room temperature has become active. (See, for example, Non-Patent Document 2). When the excited triplet is used, the upper limit of the internal quantum efficiency is 100%. In principle, the luminous efficiency is four times that of the excited singlet, and the performance is almost the same as that of a cold cathode tube. Is applicable and attracts attention. For example, many compounds have been studied for synthesis centering on heavy metal complexes such as iridium complexes (see, for example, Non-Patent Document 3).

Further, studies using tris (2-phenylpyridine) iridium as a dopant have been made (for example, see Non-Patent Document 2). In addition, L ₂ Ir (acac), for example, (ppy) ₂ Ir (acac) (see, for example, Non-Patent Document 4) as a dopant, and tris (2- (p-tolyl) pyridine) iridium (as a dopant) Examination using Ir (ptpy) ₃ ), tris (benzo [h] quinoline) iridium (Ir (bzq) ₃ ), Ir (bzq) ₂ ClP (Bu) ₃ (for example, see Non-Patent Document 5). Studies using an iridium complex using phenylpyrazole as a ligand (for example, see Patent Document 4) have been conducted.

On the other hand, organic light-emitting devices that achieve high-intensity light emission are devices in which organic substances are stacked by vacuum deposition. However, wet methods are used from the viewpoint of simplification of the manufacturing process, processability, and increase in area. Further, device fabrication by transfer or bonding has been studied. For example, in a method using transfer or bonding, a light emitting layer made of a host material PVK and a phosphorescent compound Ir (ppy) ₃ is transferred onto an organic layer formed in advance on ITO, and a device having a laminated structure is formed. I am making it. (For example, refer to Patent Document 5.)
Japanese Patent No. 3093796 Japanese Unexamined Patent Publication No. 63-264692 JP-A-3-255190 International Publication No. 04/085450 Pamphlet Japanese Patent Laid-Open No. 2004-22544 M.M. A. Baldo et al. , Nature, 395, 151-154 (1998) M.M. A. Baldo et al. , Nature, 403, 17, 750-753 (2000) S. Lamansky et al. , J .; Am. Chem. Soc. 123, 4304 (2001) M.M. E. Thompson et al. , The 10th International Works on Organic and Organic Electroluminescence (EL'00, Hamamatsu) Moon-Jae Youn. 0 g, Tsutsuo Tsutsui et al. , The 10th International Works on Organic and Organic Electroluminescence (EL'00, Hamamatsu)

  However, in this method using transfer or bonding, a step of transferring a light emitting layer of a transfer material onto a substrate having a hole transport layer or an electron transport layer using a transfer material having a light emitting layer on a support. In the case of carrying out the process, the phosphorescent compound is partially decomposed at the time of transfer, which causes a problem of reducing the luminous efficiency and life of the device. Furthermore, it has been desired to improve the generation of dark spots during driving and the temporal stability under high temperature and high humidity.

  The present invention has been made in view of the problems, and the object of the present invention is to show good light emission luminance and life, less dark spots during driving, and stability over time under high temperature and high humidity storage. High organic EL element, and a display device and a lighting device using the same are provided.

  The above object of the present invention is achieved by the following configurations.

  1. In an organic electroluminescence device having an electrode and at least two organic layers on a substrate, at least one of the organic layers is a light emitting layer containing a phosphorescent compound and a host compound, and the HOMO of the phosphorescent compound is -5. An organic electroluminescence device characterized in that the organic electroluminescence device has a thickness of .15 to -3.50 eV and a LUMO of -1.25 to +1.00 eV, and at least one of the organic layers is formed by transfer or bonding.

  2. 2. The organic electroluminescence device according to 1 above, wherein the phosphorescent compound has a HOMO of −4.80 to −3.50 eV and a LUMO of −0.80 to +1.00 eV.

  3. 3. The organic electroluminescence device according to 1 or 2 above, wherein the phosphorescent compound is represented by the following general formula (1).

(In the formula, R ₁ represents a substituent. Z represents a group of nonmetallic atoms necessary to form a 5- to 7-membered ring. N1 represents an integer of 0 to _5. B _{1 to} B ₅ represent carbon. Represents an atom, nitrogen atom, oxygen atom or sulfur atom, at least one represents a nitrogen atom, M ₁ represents a group 8-10 metal in the periodic table, and X ₁ and X ₂ represent a carbon atom, nitrogen atom or Represents an oxygen atom, and L ₁ represents an atomic group forming a bidentate ligand together with X ₁ and X ₂ , m1 represents an integer of 1, 2 or 3, m2 represents an integer of 0, 1 or 2 (Where m1 + m2 is 2 or 3)
4). 4. The organic electroluminescence device as described in 3 above, wherein in the phosphorescent compound represented by the general formula (1), m2 is 0.

5). 5. The organic electroluminescent device as described in 3 or 4 above, wherein in the phosphorescent compound represented by the general formula (1), the nitrogen-containing heterocycle formed by B _{1 to} B ₅ is an imidazole ring.

  6). 6. The organic electroluminescent element according to any one of 1 to 5, wherein the light emitting layer is formed by transfer or bonding.

  7). 7. The organic electroluminescent element according to any one of 1 to 6, wherein the substrate has a gas barrier layer.

  8). 8. The organic electroluminescence device according to any one of 1 to 7, which emits blue light.

  9. 8. The organic electroluminescence element according to any one of 1 to 7, which emits white light.

  10. 10. A display device comprising the organic electroluminescence element according to any one of 1 to 9 above.

  11. An illumination device comprising the organic electroluminescence element according to any one of 1 to 9 above.

  12 12. A display device comprising the illumination device according to 11 and a liquid crystal element as display means.

  According to the present invention, an organic EL element which exhibits good light emission luminance and lifetime, has few dark spots during driving, and has high temporal stability under high temperature and high humidity storage, and a display device and an illumination device using the same Could be provided.

  In the organic electroluminescence device having an electrode and at least two organic layers on a substrate, at least one of the organic layers is a light emitting layer containing a phosphorescent compound, and the HOMO of the phosphorescent compound is −5.15 to −3.50 eV, LUMO is −1.25 to +1.00 eV, and at least one layer of the organic layer is formed by transfer or bonding, so that good emission luminance and lifetime can be obtained. It was found that an organic electroluminescence device with few dark spots under high temperature and high humidity storage and high stability over time could be obtained.

  Hereinafter, each component of the present invention will be described in detail.

  First, HOMO and LUMO according to the present invention will be described.

  In the present invention, the values of HOMO and LUMO are Gaussian 98 (Gaussian 98, Revision A.11.4, MJ Frisch, et al, Gaussian, Inc., Pittsburgh PA, software for molecular orbital calculation manufactured by Gaussian, USA. , 2002.) and is defined as a value (eV unit converted value) calculated by performing structural optimization using B3LYP / LanL2DZ as a keyword. This calculation value is effective because the correlation between the calculation value obtained by this method and the experimental value is high.

  Next, the phosphorescent compound represented by the general formula (1) will be described.

  In the phosphorescent compound represented by the general formula (1), HOMO is −5.15 to −3.50 eV, and LUMO is −1.25 to +1.00 eV. Preferably, HOMO is −4.80 to −3.50 eV, and LUMO is −0.80 to +1.00 eV.

In the phosphorescent compound represented by the general formula (1), examples of the substituent represented by R ₁ include an alkyl group (eg, methyl group, ethyl group, propyl group, isopropyl group, tert-butyl group, pentyl group). Group, hexyl group, octyl group, dodecyl 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 (for example, ethynyl group, propargyl group, etc.), aromatic hydrocarbon ring group (also called aromatic carbocyclic group, aryl group, etc.), for example, phenyl group, p-chlorophenyl group, mesityl group, tolyl group, xylyl group, Naphthyl, anthryl, azulenyl, acenaphthenyl, fluorenyl, phenanthryl, inde Group, pyrenyl group, biphenylyl group, etc.), aromatic heterocyclic group (for example, pyridyl group, pyrimidinyl group, furyl group, pyrrolyl group, imidazolyl group, benzoimidazolyl group, pyrazolyl group, pyrazinyl group, triazolyl group (for example, 1, 2,4-triazol-1-yl group, 1,2,3-triazol-1-yl group, etc.), oxazolyl group, benzoxazolyl group, thiazolyl group, isoxazolyl group, isothiazolyl group, furazanyl group, thienyl group, A quinolyl group, a benzofuryl group, a dibenzofuryl group, a benzothienyl group, a dibenzothienyl group, an indolyl group, a carbazolyl group, a carbolinyl group, a diazacarbazolyl group (one of the carbon atoms constituting the carboline ring of the carbolinyl group is a nitrogen atom) ), Quinoxalinyl group, pyri Dazinyl group, triazinyl group, quinazolinyl group, phthalazinyl group, etc.), heterocyclic group (eg, pyrrolidyl group, imidazolidyl group, morpholyl group, oxazolidyl group, etc.), alkoxy group (eg, methoxy group, ethoxy group, propyloxy group, pentyl) Oxy group, hexyloxy group, octyloxy group, dodecyloxy group, etc.), cycloalkoxy group (eg, cyclopentyloxy group, cyclohexyloxy group, etc.), aryloxy group (eg, phenoxy group, naphthyloxy group, etc.), 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, methyloxycarbonyl group, ethyloxycarbonyl group, butyloxycarbonyl group, octyloxycarbonyl group, dodecyloxycarbonyl group, etc.), aryloxycarbonyl group (eg, phenyl) Oxycarbonyl group, naphthyloxycarbonyl group, etc.), sulfamoyl group (for example, 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, cyclohexylcarbonyl 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, cyclohexylcarbonylamino group, 2-ethylhexylcarbonylamino group, octylcarbonyl Ruamino group, dodecylcarbonylamino group, phenylcarbonylamino group, naphthylcarbonylamino group, etc.), carbamoyl group (for example, aminocarbonyl group, methylaminocarbonyl group, dimethylaminocarbonyl group, propylaminocarbonyl group, pentylaminocarbonyl group, cyclohexyl). Aminocarbonyl group, octylaminocarbonyl group, 2-ethylhexylaminocarbonyl 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-pyridy Aminoureido groups, etc.), sulfinyl groups (for example, methylsulfinyl group, ethylsulfinyl group, butylsulfinyl group, cyclohexylsulfinyl group, 2-ethylhexylsulfinyl group, dodecylsulfinyl group, phenylsulfinyl group, naphthylsulfinyl group, 2-pyridylsulfinyl group) Etc.), alkylsulfonyl groups (for example, methylsulfonyl group, ethylsulfonyl group, butylsulfonyl group, cyclohexylsulfonyl group, 2-ethylhexylsulfonyl group, dodecylsulfonyl group, etc.), arylsulfonyl groups or heteroarylsulfonyl groups (for example, phenylsulfonyl) Group, naphthylsulfonyl group, 2-pyridylsulfonyl group, etc.), amino group (for example, amino group, ethylamino group, dimethylamino group, butylamino group) Group, cyclopentylamino group, 2-ethylhexylamino group, dodecylamino group, anilino group, naphthylamino group, 2-pyridylamino group, etc., cyano group, nitro group, hydroxy group, mercapto group, silyl group (for example, trimethylsilyl group, Triisopropylsilyl group, triphenylsilyl group, phenyldiethylsilyl group, etc.). Of these substituents, preferred are an alkyl group and an aryl group.

  Z represents a nonmetallic atom group necessary for forming a 5- to 7-membered ring. Examples of the 5- to 7-membered ring formed by Z include a benzene ring, naphthalene ring, pyridine ring, pyrimidine ring, pyrrole ring, thiophene ring, pyrazole ring, imidazole ring, oxazole ring, and thiazole ring. Of these, a benzene ring is preferred.

B ₁ .about.B ₅ represents a carbon atom, a nitrogen atom, an oxygen atom or a sulfur atom, at least one nitrogen atom. The nitrogen-containing heterocycle formed by these five atoms is preferably a monocycle. Examples include pyrrole ring, pyrazole ring, imidazole ring, triazole ring, tetrazole ring, oxazole ring, isoxazole ring, thiazole ring, isothiazole ring, oxadiazole ring, and thiadiazole ring. Of these, a pyrazole ring and an imidazole ring are preferable, and an imidazole ring is more preferable. These rings may be further substituted with the above substituents. Preferred as a substituent are an alkyl group and an aryl group, and more preferred are a substituted alkyl group and an unsubstituted aryl group.

L ₁ represents an atomic group that forms a bidentate ligand together with X ₁ and X ₂ . Specific examples of the bidentate ligand represented by X ₁ -L ₁ -X ₂ include, for example, substituted or unsubstituted phenylpyridine, phenylpyrazole, phenylimidazole, phenyltriazole, phenyltetrazole, pyrazabol, picolinic acid And acetylacetone. These groups may be further substituted with the above substituents.

  m1 represents an integer of 1, 2 or 3, m2 represents an integer of 0, 1 or 2, and m1 + m2 is 2 or 3. Especially, the case where m2 is 0 is preferable.

As the metal represented by M ₁ , a transition metal element of group 8 to 10 of the periodic table (also simply referred to as a transition metal) is used, among which iridium and platinum are preferable, and iridium is more preferable.

  The phosphorescent compound represented by the general formula (1) may or may not have a polymerizable group or a reactive group.

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

  These metal complexes are described in, for example, Organic Letter, vol. 16, 2579-2581 (2001), Inorganic Chemistry, Vol. 30, No. 8, 1685-1687 (1991), J. Am. Am. Chem. Soc. , 123, 4304 (2001), Inorganic Chemistry, Vol. 40, No. 7, 1704-1711 (2001), Inorganic Chemistry, Vol. 41, No. 12, 3055-3066 (2002) New Journal of Chemistry, Vol. 26, page 1171 (2002), European Journal of Organic Chemistry, Vol. 4, pages 695-709 (2004), and methods such as references described in these documents. It can be synthesized by applying.

  Next, the host compound used in the present invention will be described.

  Examples of the host compound used in the present invention include carbazole derivatives, azacarbazole derivatives, triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives and pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, phenanthroline. Derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, stilbene derivatives, organometallic compounds, arylmethane derivatives, and the like can be given.

  Of these, more preferred are compounds represented by the following structures.

Wherein, R ₁ to R ₄ represents a substituent. n1 and n2 represent the integer of 0-3. A ₁ and A ₂ represent a compound represented by the following general formula (a).

In the formula, Z ₁ and Z ₂ represent an aromatic heterocyclic ring or an aromatic hydrocarbon ring which may have a substituent, and Z ₃ represents a divalent linking group or a simple bond. L ₁ represents a divalent linking group or a simple bond.

In the formula, R ₁₁ represents a substituent. n11 represents an integer of 0 to 4. A ₁₁ and A ₁₂ represent the compound represented by the general formula (a).

In the formula, R ₂₁ and R ₂₂ represent a substituent. n21 and n22 represent an integer of 0 to 3. A ₂₁ and A ₂₂ represent the compound represented by the general formula (a). L represents a divalent linking group.

In the formula, R ₃₁ and R ₃₂ represent a substituent. n31 and n32 represent an integer of 0 to 3. Y represents an oxygen atom, a sulfur atom, an imino group, a sulfoxide group or a sulfonyl group. A ₃₁ and A ₃₂ represent a compound represented by the above general formula (A).

  In the general formulas (2), (3), (4) and (5), the general formulas (2), (3) and (5) are more preferable.

In the general formulas (2), (3), (4) and (5), examples of the substituent represented by R _{1 to} R ₄ , R ₁₁ , R ₂₁ and R ₂₂ , R ₃₁ and R ₃₂ include An alkyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, particularly preferably 1 to 8 carbon atoms, such as methyl, ethyl, iso-propyl, tert-butyl, n-octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl, cyclohexyl, etc.), an alkenyl group (preferably having 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, particularly preferably 2 to 8 carbon atoms). Yes, for example, vinyl, allyl, 2-butenyl, 3-pentenyl, etc.), alkynyl group (preferably having 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, particularly preferably C2-C8, for example, propargyl, 3-pentynyl, etc.), aryl groups (preferably C6-C30, more preferably C6-C20, particularly preferably C6-C12 For example, phenyl, p-methylphenyl, naphthyl, etc.), an amino group (preferably having 0 to 20 carbon atoms, more preferably 0 to 10 carbon atoms, and particularly preferably 0 to 6 carbon atoms). , For example, amino, methylamino, dimethylamino, diethylamino, dibenzylamino, etc.), an alkoxy group (preferably having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, particularly preferably 1 to carbon atoms). 8 and includes, for example, methoxy, ethoxy, butoxy, etc.), an aryloxy group (preferably having 6 to 20 carbon atoms, more preferred) Or 6 to 16 carbon atoms, particularly preferably 6 to 12 carbon atoms, such as phenyloxy, 2-naphthyloxy, etc.), acyl groups (preferably 1 to 20 carbon atoms, more preferably carbon atoms). 1 to 16, particularly preferably 1 to 12, and examples thereof include acetyl, benzoyl, formyl, pivaloyl, and the like, an alkoxycarbonyl group (preferably having 2 to 20 carbon atoms, more preferably 2 carbon atoms). To 16, particularly preferably 2 to 12 carbon atoms, such as methoxycarbonyl, ethoxycarbonyl, etc.), aryloxycarbonyl groups (preferably 7 to 20 carbon atoms, more preferably 7 to 16 carbon atoms, Particularly preferably, it has 7 to 10 carbon atoms, and examples thereof include phenyloxycarbonyl. ), An acyloxy group (preferably having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 10 carbon atoms, such as acetoxy and benzoyloxy), an acylamino group (preferably Has 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 10 carbon atoms, and examples thereof include acetylamino, benzoylamino, and the like, and an alkoxycarbonylamino group (preferably having a carbon number). 2 to 20, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 12 carbon atoms, and examples include methoxycarbonylamino and the like, aryloxycarbonylamino group (preferably 7 to 20 carbon atoms, More preferably, it has 7 to 16 carbon atoms, particularly preferably 7 to 12 carbon atoms. A sulfonylamino group (preferably having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, and particularly preferably 1 to 12 carbon atoms, such as methanesulfonylamino and benzenesulfonylamino). ), A sulfamoyl group (preferably having 0 to 20 carbon atoms, more preferably 0 to 16 carbon atoms, and particularly preferably 0 to 12 carbon atoms. For example, sulfamoyl, methylsulfamoyl, dimethylsulfamoyl , Phenylsulfamoyl, etc.), a carbamoyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as carbamoyl, methylcarbamoyl, And diethylcarbamoyl and phenylcarbamoyl). Kirthio group (preferably having 1 to 20 carbon atoms, more preferably having 1 to 16 carbon atoms, particularly preferably having 1 to 12 carbon atoms, such as methylthio, ethylthio, etc.), arylthio group (preferably having carbon number) 6 to 20, more preferably 6 to 16 carbon atoms, particularly preferably 6 to 12 carbon atoms, including, for example, phenylthio and the like, a sulfonyl group (preferably 1 to 20 carbon atoms, more preferably carbon number). 1 to 16, particularly preferably 1 to 12 carbon atoms, for example, mesyl, tosyl, etc.), sulfinyl group (preferably 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably C1-C12, for example, methanesulfinyl, benzenesulfinyl, etc.), ureido group (preferably C1-C1) 20, More preferably, it is C1-C16, Most preferably, it is C1-C12, for example, ureido, methylureido, phenylureido etc. are mentioned. ), Phosphoric acid amide groups (preferably having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, and particularly preferably 1 to 12 carbon atoms, and examples thereof include diethyl phosphoric acid amide and phenyl phosphoric acid amide. .), Hydroxyl group, mercapto group, halogen atom (eg, fluorine atom, chlorine atom, bromine atom, iodine atom), cyano group, sulfo group, carboxyl group, nitro group, hydroxamic acid group, sulfino group, hydrazino group, imino group Group, heterocyclic group (including hetero atoms such as nitrogen atom, oxygen atom, sulfur atom, selenium atom, etc., preferably having 1 to 30 carbon atoms, more preferably 1 to 20 carbon atoms, for example, imidazolyl, pyridyl , Furyl, piperidyl, morpholino, etc.). These substituents may be further substituted. If possible, they may be linked to form a ring. Of these, preferred are an alkyl group and an aryl group.

In the general formula (a) and the general formula (4), the divalent linking group represented by L and L ₁ includes a hydrocarbon group such as alkylene, alkenylene, alkynylene, and arylene, and also includes a hetero atom. A divalent linking group derived from a compound having an aromatic heterocycle (also called a heteroaromatic compound) such as a thiophene-2,5-diyl group or a pyrazine-2,3-diyl group. It may be a chalcogen atom such as oxygen or sulfur. Further, it may be a group such as an alkylimino group, a dialkylsilanediyl group, or a diarylgermandiyl group that connects and connects heteroatoms.

  As the organic compound used in the present invention, either a low molecular compound or a high molecular compound can be used.

  The polymer compound is obtained by polymerizing a compound having at least one polymerizable group (polymerizable compound). Examples of the polymerizable group include a vinyl group, an epoxy group, an oxetane group, an isocyanate group, and a thioisocyanate group. Is mentioned. Among these, a vinyl group is preferable. The organic compounds represented by the general formulas (2) to (5) according to the present invention may have these polymerizable groups at any position in the molecule.

  The polymerization reaction of the polymerizable compound will be described. As the time when the polymerization is formed, a polymer that has been polymerized in advance may be used, or polymerization may be performed in the solution before the device is manufactured or during the device preparation. Further, a bond may be formed after the element is manufactured. When a polymerization reaction is caused, external energy (heat, light, ultrasonic waves, etc.) may be supplied, or a polymerization initiator, an acid catalyst or a base catalyst may be added to cause the reaction. Alternatively, when the polymerization reaction is caused when the compound according to the present invention is contained in the light emitting element, the reaction may be caused by a current supplied at the time of driving the light emitting element or generated light or heat. Two or more polymerizable compounds may be polymerized to form a copolymer.

  The polymerized polymer compound preferably has a weight average molecular weight of 5,000 to 1,000,000, more preferably 5,000 to 200,000.

  Examples of the radical polymerization initiator include 2,2′-azobisbutyronitrile, 2,2′-azobiscyclohexanecarbonitrile, 1,1′-azobis (cyclohexane-1-carbonitrile), 2,2 ′. -Azobis (2-methylbutyronitrile), 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (4-methoxy-2,4-dimethylvaleronitrile), 4,4 '-Azobis (4-cyanovaleric acid), dimethyl 2,2'-azobisisobutyrate, 2,2'-azobis (2-methylpropionamidoxime), 2,2'-azobis (2- (2-imidazoline-2- Yl) propane), azo initiators such as 2,2'-azobis (2,4,4-trimethylpentane), benzoyl peroxide, di-t-butyl peroxide, t-butyl Peroxide initiators such as droperoxide and cumene hydroperoxide, diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzyldimethyl ketal, benzyl-β-methoxyethyl acetal, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 4- (2-hydroxyethoxy) phenyl- (2-hydroxy-2-propyl) ketone, 1-hydroxycyclohexyl phenylketone, 4- Aromatic carbonyl initiators such as phenoxydichloroacetophenone, 4-t-butyldichloroacetophenone, 4-t-butyltrichloroacetophenone, 1- (4-dodecylphenyl) -2-hydroxy-2-methylpropan-1-one Is mentioned. Further, disulfide initiators such as tetraethylthiilam disulfide, nitroxyl initiators such as 2,2,6,6-tetramethylpiperidine-1-oxyl, 4,4′-di-t-butyl-2,2′- Living radical polymerization initiators such as a bipyridine copper complex-methyl trichloroacetate complex can also be used.

  Acid catalysts include activated clays, clays such as acidic clays, mineral acids such as sulfuric acid and hydrochloric acid, organic acids such as p-toluenesulfonic acid and trifluoroacetic acid, aluminum chloride, ferric chloride, stannic chloride, Lewis acids such as titanium trichloride, titanium tetrachloride, boron trifluoride, hydrogen fluoride, boron tribromide, aluminum bromide, gallium chloride, gallium bromide, and solid acids such as zeolite, silica, alumina, silica Various types such as alumina, cation exchange resin, heteropolyacid (for example, phosphotungstic acid, phosphomolybdic acid, silicotungstic acid, silicomolybdic acid) can be used.

Examples of the basic catalyst used in the present invention include alkali metal carbonates such as Li ₂ CO ₃ , Na ₂ CO ₃ and K ₂ CO ₃ , alkaline earth metal carbonates such as BaCO ₃ and CaCO ₃ , Li ₂ O, Alkali metal oxides such as Na ₂ O and K ₂ O, alkaline earth metal oxides such as BaO and CaO, alkali metals such as Na and K, alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, or Examples thereof include alkoxides such as sodium, potassium, rubidium and cesium.

  Specific examples of the host compound and the polymerizable compound to be the host compound according to the present invention are given below, but the present invention is not limited thereto.

  The phosphorescent compound represented by the general formula (1) according to the present invention may be used in combination with other phosphorescent compounds or fluorescent compounds.

  The phosphorescent compound used in the present invention is preferably a complex compound containing a group VIII metal in the periodic table of elements, more preferably an iridium compound, an osmium compound, or a platinum compound (platinum complex compound). Of these, iridium compounds are most preferred.

  Specific examples of the phosphorescent compound used in the present invention are shown below, but are not limited thereto. These compounds are described, for example, in Inorg. Chem. 40, 1704-1711, and the like. The fluorescent compound and the phosphorescent compound used in combination may or may not have a polymerizable group or a reactive group.

  The fluorescent compound used in the present invention is a compound capable of obtaining fluorescence emission with a maximum emission wavelength different from the case where the fluorescent compound is not contained, and preferable one is that having a high fluorescence quantum yield in a solution state. is there. Here, the fluorescence quantum yield is preferably 10% or more, particularly preferably 30% or more. Specific fluorescent compounds include, for example, coumarin dyes, anthracene dyes, pyran dyes, cyanine dyes, croconium dyes, squalium dyes, oxobenzanthracene dyes, fluorescein dyes, rhodamine dyes, and pyrylium dyes. Examples thereof include dyes, perylene dyes, stilbene dyes, polythiophene dyes, and rare earth complex phosphors. The fluorescence quantum yield here can be measured by the method described in Spectroscopic II, page 362 (1992 edition, Maruzen) of 4th edition Experimental Chemistry Course 7.

  Specific examples of the fluorescent compound according to the present invention are shown below, but the present invention is not limited thereto.

<< Method for Manufacturing Organic EL Element >>
Transfer in the present invention means that only the organic layer is laminated on a substrate from a transfer material having an organic layer on the support, and the support and the like are peeled off. In the present invention, the term “bonding” means that an organic layer laminated on an electrode (preferably an anode) is bonded on a substrate.

  In the method for producing an organic EL device of the present invention, a transfer material is produced by forming an organic layer on a support, and the transfer material is superimposed on the substrate and heated so that the organic layer side faces the film formation surface of the substrate. Alternatively, after pressurizing and softening the layer to adhere to the film formation surface of the substrate, the support is peeled off to leave only the organic layer on the film formation surface, and the organic layer is deposited on the surface of the substrate. Is to be transferred to. Only one transfer material may be used, or two or more transfer materials having organic layers having the same or different composition may be used.

  A generally known method can be used as the heating means, and for example, a laminator, an infrared heater, a laser, a thermal head, a heat roller, or the like can be used. When transferring a large area, a laminator, an infrared heater, a heat roller or the like is preferably used as the heating means. As the thermal head, for example, First Laminator VA-400III (manufactured by Taisei Laminator Co., Ltd.), a thermal head for thermal transfer printing, or the like can be used.

  The transfer temperature is not particularly limited and can be changed depending on the material of the organic layer and the heating member, but is generally preferably 40 to 250 ° C, more preferably 50 to 200 ° C, and particularly preferably 60 to 180 ° C. However, the temperature range for transfer is related to the heat resistance of the heating member, the transfer material and the substrate, and changes as the heat resistance is improved.

  When two or more kinds of transfer materials are used, it is preferable that the transfer temperature of the transfer material transferred first is equal to or higher than the transfer temperature of the transfer material transferred next. When a transfer material having two or more organic layers is used in one transfer material, it is preferable that the transfer temperature of the organic layer to be transferred first is equal to or higher than the transfer temperature of the organic layer to be transferred next. The glass transition temperature of the organic layer of the transfer material or the polymer component contained in the organic layer, or the flow start temperature of the organic layer is preferably 40 ° C. or higher and the transfer temperature + 40 ° C. or lower. The two or more organic layers to be transferred preferably contain at least one common component.

  It is preferable to preheat at least one of the substrate and the transfer material before transfer. The preheating temperature is preferably 30 ° C. or higher and the transfer temperature + 20 ° C. or lower. The temperature at which the support is peeled off is preferably 10 ° C. or higher and the transfer temperature or lower.

  After the support is peeled off, the transferred organic layer is preferably heated again. The reheating temperature is preferably equal to or higher than the glass transition temperature or flow start temperature of the organic layer.

In the present invention, the transfer operation is preferably performed in a reduced-pressure atmosphere. The pressure of the reduced-pressure atmosphere can be appropriately selected depending on the light-emitting element manufacturing apparatus, but is preferably 1 × 10 ⁻³ Pa or more and 1 × 10 ⁻⁵ Pa or less.

  The organic layer of the transfer material preferably has at least a light emitting compound or a carrier transporting material. Moreover, it is preferable to provide an electron transport layer in advance on the substrate, and to transfer the light emitting layer and the hole transport layer onto the electron transport layer.

  In the present invention, the transfer material used for the production of the organic EL device is preferably formed by forming an organic layer on a support by a wet method. Further, two or more organic layers having the same or different composition may be formed on a single support in a surface sequential manner.

  In the present invention, a plurality of organic layers can be laminated on the substrate by repeatedly performing a transfer step (including a step of peeling the support in the transfer step). The plurality of organic layers may be the same composition or different. In the case of the same composition, there is an advantage that it is possible to prevent the layer from coming off due to transfer failure or peeling failure. When different layers are provided, the function can be separated to improve the light emission efficiency. For example, a transparent conductive layer / hole injection layer / hole transport layer is formed on the film formation surface by the transfer method according to the present invention. / Light emitting layer / electron transport layer / electron injection layer / back electrode can be laminated. At this time, the transfer temperature is preferably set so that the temperature at which the previous transfer material is heated is equal to or higher than the temperature at which the next transfer material is heated so that the previous transfer layer is not reversely transferred to the next transfer layer.

  It is preferable to reheat the organic layer transferred to the substrate or the new organic layer transferred to the previously transferred organic layer as necessary. By reheating, the organic layer is more closely attached to the substrate or the previously transferred organic layer. It is preferable to apply pressure as necessary during reheating. The reheating temperature is preferably in the range of the transfer temperature ± 50 ° C.

  In order to prevent the previous transfer layer from being reversely transferred to the next transfer layer, a surface treatment may be performed between the previous transfer process and the next transfer process so as to improve the adhesion force on the film formation surface. Examples of such surface treatment include activation treatment such as corona discharge treatment, flame treatment, glow discharge treatment, and plasma treatment. When the surface treatment is used in combination, the transfer temperature of the previous transfer material may be lower than the transfer temperature of the next transfer material unless reverse transfer is performed.

  The equipment for producing the organic EL device of the present invention includes a device for feeding a transfer material in which an organic layer is formed on a support by a wet method, and pressing the transfer material against the film-forming surface of the substrate while heating the transfer material. Accordingly, it is possible to use equipment having an apparatus for transferring the organic layer to the film formation surface of the substrate and an apparatus for peeling the support of the transfer material from the organic layer. Hereinafter, the facing device and the peeling device are also referred to as a transfer device.

  The equipment preferably includes means for preheating the transfer material and / or the substrate prior to delivery to the transfer apparatus. Further, it is preferable to have a cooling device after the transfer device. It is preferable that an entrance angle adjusting unit that makes an entrance angle of the transfer material with respect to the substrate 90 ° or less is provided on the front surface of the transfer device. Further, it is preferable that a peeling angle adjusting unit is provided on the rear surface of the facing device or the cooling device so that the peeling angle of the transfer material with respect to the organic layer of the support is 90 ° or more.

Details of the method and apparatus for producing the above organic EL element are described in JP-A No. 2002-289346 and the like.
Hereinafter, the configuration and contents of the transfer material will be described. In particular, the case where a support is used as the transfer material will be described. The transfer material has a support and at least one organic layer. Depending on the process, a transfer material having at least one light emitting layer may be used.

(1) Configuration The organic layer (a layer containing an organic compound that functions as an organic layer of an organic EL element) is preferably produced on a support by a wet method. The transfer material provided with the organic layer may be prepared as an independent transfer material for each organic layer, or may be provided in the surface order. That is, a plurality of organic layers may be provided on a single support in the order of stacking elements. If this transfer material is used, a plurality of organic layers can be formed continuously without the need to replace the transfer material.

  Further, if a transfer material in which two or more organic layers are previously laminated on a support is used, a multilayer film can be laminated on the film formation surface of the substrate in one transfer step. When laminating on the support beforehand, if the interface of each organic layer to be laminated is not uniform, the movement of holes and electrons will be uneven, so it is necessary to carefully select the solvent to make the interface uniform. In addition, it is necessary to select an organic compound for the organic layer that is soluble in the solvent.

(2) Support When transferring using a support, it is preferable that the support used in the present invention is chemically and thermally stable and is made of a flexible material. Specifically, fluororesin (for example, tetrafluoroethylene resin (PTFE), trifluoroethylene chloride resin (PCTFE)), polyester (for example, polyethylene terephthalate, polyethylene naphthalate (PEN)), polyarylate, polycarbonate, A thin sheet such as polyolefin (for example, polyethylene, polypropylene), polyethersulfone (PES), or a laminate thereof is preferable. The thickness of the support is suitably from 1 to 300 μm, more preferably from 3 to 200 μm, particularly preferably from 3 to 50 μm.

<< Formation of organic layer on substrate and support >>
The organic layer according to the present invention can be formed by either vapor deposition or coating, but is preferably formed by coating. Examples of the coating method include spin coating, gravure coating, dip coating, casting, die coating, roll coating, bar coating, extrusion coating, and inkjet coating.

<< Layer structure of organic EL element >>
The layer structure of the organic EL element of the present invention will be described.

  The organic EL device of the present invention has an electrode (cathode and anode) and at least two organic layers on a substrate, and at least one of the organic layers is a light emitting layer containing a phosphorescent compound and a host compound.

  In a broad sense, the light emitting layer according to the present invention is a layer that emits light when a current is passed through an electrode composed of a cathode and an anode. Specifically, when a current is passed through an electrode composed of a cathode and an anode, It refers to a layer containing a compound that emits light.

  The organic layer according to the present invention may have a hole transport layer, an electron transport layer, an anode buffer layer, a cathode buffer layer, and the like in addition to the light emitting layer as necessary, and has a structure sandwiched between a cathode and an anode. . Specific examples include the structures shown below.

(I) Anode / hole transport layer / light emitting layer / cathode (ii) Anode / light emitting layer / electron transport layer / cathode (iii) Anode / hole transport layer / light emitting layer / electron transport layer / cathode (iv) Anode / Anode buffer layer / hole transport layer / light emitting layer / electron transport layer / cathode buffer layer / cathode Of the plural layers sandwiched between electrodes (anode and cathode) constituting the organic EL element, two organic layers are provided. It is above, More preferably, it is three or more layers.

<Light emitting layer>
A plurality of host compounds may be used in combination in the light emitting layer of the organic EL device of the present invention. By using a plurality of types of host compounds, it is possible to adjust the movement of electric charges, and the organic EL element can be made highly efficient. In addition, by using a plurality of phosphorescent compounds, it is possible to mix different light emissions, thereby obtaining an arbitrary emission color. White light emission is possible by adjusting the kind of phosphorescent compound and the amount of doping, and can also be applied to illumination and backlight.

  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, It is preferable to adjust film thickness in the range of 5 nm-5 micrometers.

  Next, other layers constituting the organic EL element in combination with the light emitting layer, such as a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer, will be described.

<< Hole injection layer, hole transport layer, electron injection layer, electron transport layer >>
The hole injection layer and hole transport layer used in the present invention have a function of transmitting holes injected from the anode to the light emitting layer. The hole injection layer and hole transport layer are formed of an anode and a light emitting layer. By interposing them, many holes are injected into the light emitting layer with a lower electric field, and electrons injected into the light emitting layer from the cathode, electron injection layer, or electron transport layer are injected into the light emitting layer and holes. Due to an electron barrier existing at the interface of the layer or the hole transport layer, it is accumulated at the interface in the light emitting layer, and the light emitting efficiency is improved.

《Hole injection material, hole transport material》
The material of the hole injection layer and hole transport layer (hereinafter referred to as hole injection material and hole transport material) has the property of transmitting holes injected from the anode to the light emitting layer. If it is a thing, there will be no restriction | limiting in particular, In the photoconductive material, what is conventionally used as a charge injection transport material of a hole, and well-known used for the hole injection layer of an organic EL element, and a hole transport layer Any one can be selected and used.

  The hole injection material and the hole transport material have either hole injection or transport or electron barrier properties, and may be either organic or inorganic. Examples of the hole injection material and hole transport material include triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives and pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, An oxazole derivative, a styryl anthracene derivative, a fluorenone derivative, a hydrazone derivative, a stilbene derivative, a silazane derivative, an aniline-based copolymer, or a conductive polymer oligomer, particularly a thiophene oligomer can be used.

  The above-mentioned materials can be used as the hole injection material and the hole transport material, 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 the aromatic tertiary amine compound and styrylamine compound 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; Bis (4-di-p-tolylaminophenyl) cyclohexane; N, N, N ′, N′-tetra-p-tolyl-4,4′-diaminobiphenyl; 1,1-bis (4-di-p- Tolylaminophenyl) -4-phenylcyclohexane; bis (4-dimethylamino-2-methylphenyl) phenylmethane; bis (4-di-p-tolylaminophenyl) phenylmethane; N, N′-diphenyl-N, N -Di (4-methoxyphenyl) -4,4'-diaminobiphenyl; N, N, N ', N'-tetraphenyl-4,4'-diaminodiphenyl ether; 4,4'-bis (diphenylamino) quadri N; N, N-tri (p-tolyl) amine; 4- (di-p-tolylamino) -4 '-[4- (di-p-tolylamino) styryl] stilbene; 4-N, N-diphenyl Amino- (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 (α-NPD), JP-A-4-30 4,4 ′, 4 ″ -tris [N- (3-methylphenyl) -N-phenylamino] triphenylamine in which three triphenylamine units described in Japanese Patent No. 8688 are linked in a starburst type ( MTDATA) etc. Further, 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.

  Alternatively, 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 injection layer and the hole transport layer are formed by thinning the hole injection material and the hole transport material by a known method such as a vacuum deposition method, a spin coating method, a casting method, or an LB method. Can be formed.

(Hole injection layer thickness, hole transport layer thickness)
Although there is no restriction | limiting in particular about the film thickness of a positive hole injection layer and a positive hole transport layer, It is preferable to adjust to the range about 5 nm-5 micrometers. The hole injection layer and hole transport layer may have a single layer structure composed of one or more of the above materials, or may have a multilayer structure composed of a plurality of layers having the same composition or different compositions.

<< Electron transport layer, electron transport material >>
The electron transport layer according to the present invention is only required to have a function of transmitting electrons injected from the cathode to the light emitting layer, and as the material thereof, any one of conventionally known compounds can be selected and used. Can do.

  Examples of materials used for the electron transport layer (hereinafter referred to as electron transport materials) include heterocyclic tetracarboxylic acid anhydrides such as nitro-substituted fluorene derivatives, diphenylquinone derivatives, thiopyran dioxide derivatives, naphthalene perylene, carbodiimides, Examples include fluorenylidenemethane derivatives, anthraquinodimethane and anthrone derivatives, oxadiazole derivatives, and organometallic complexes. 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.

  Or a metal complex of an 8-quinolinol derivative, for example, 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, and those in which the terminal is substituted with an alkyl group or a sulfonic acid group can be preferably used as the electron transport material. Alternatively, the distyrylpyrazine derivative exemplified as the material for the light-emitting layer can also be used as an electron transport material, and inorganic semiconductors such as n-type-Si and n-type-SiC can be used as well as the hole injection layer and the hole transport layer. It can be used as an electron transport material.

(Film thickness of electron transport layer)
Although the film thickness of an electron carrying layer does not have a restriction | limiting in particular, It is preferable to adjust to the range of 5 nm-5 micrometers. This electron transport layer may have a single layer structure composed of one or two or more of these electron transport materials, or may have a laminated structure composed of a plurality of layers having the same composition or different compositions.

  Further, in the present invention, a buffer layer (electrode interface layer) may exist between the anode and the light emitting layer or the hole injection layer and between the cathode and the light emitting layer or the electron injection layer.

  The buffer layer is a layer provided between the electrode and the organic layer in order to lower the driving voltage and improve the luminous efficiency. “The organic EL element and its forefront of industrialization (published by NTS Corporation on November 30, 1998) 2), Chapter 2, “Electrode Materials” (pages 123 to 166) in detail, and includes an anode buffer layer and a cathode buffer layer.

  The details of the anode buffer layer are described in JP-A-9-45479, JP-A-9-260062, JP-A-8-288069 and the like. Specific examples include a phthalocyanine buffer layer represented by copper phthalocyanine, Examples thereof include an oxide buffer layer typified 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 are described in JP-A-6-325871, JP-A-9-17574, and JP-A-10-74586, and specifically, metal buffers represented by strontium, aluminum and the like. Examples thereof include an alkali metal compound buffer layer typified by lithium fluoride, an alkaline earth metal compound buffer layer typified by magnesium fluoride, an oxide buffer layer typified by aluminum oxide and lithium oxide, and the like.

  The buffer layer is preferably a very thin film, and the film thickness is preferably in the range of 0.1 to 100 nm, although it depends on the material.

  Further, in addition to the above basic constituent layers, layers having other functions may be laminated as required. For example, JP-A-11-204258, JP-A-11-204359, and “Organic EL element and its It may have a functional layer such as a hole blocking layer described on page 237 of “Industrialization Front Line (November 30, 1998, issued by NTT)”.

"electrode"
Next, the electrode of the organic EL element will be described. The electrode of the organic EL element consists of a cathode and an 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, conductive transparent materials such as CuI, indium tin oxide (ITO), SnO ₂ , and ZnO.

  The anode may be formed by depositing a thin film of 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, or the pattern accuracy is not required so much (about 100 μm or more) ) May form a pattern through a mask having a desired shape during vapor deposition or sputtering of the electrode material. When light emission is extracted from the anode, it is desirable that the transmittance is greater than 10%, or 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 1 μm, preferably 10 to 200 nm.

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 preferably 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, from the viewpoint of electron injecting property and durability against oxidation, a mixture of an electron injecting metal and a second metal which is a stable metal having a larger work function value than this, for example, a magnesium / silver mixture, magnesium / Aluminum mixtures, magnesium / indium mixtures, aluminum / aluminum oxide (Al ₂ O ₃ ) mixtures, lithium / aluminum mixtures and the like are preferred.

  The cathode can be produced by forming a thin film from these electrode materials by a method such as vapor deposition or sputtering. Alternatively, 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 1 μm, preferably 50 to 200 nm. In addition, in order to transmit light emission, if either one of the anode or the cathode of the organic EL element is transparent or translucent, it is advantageous because the light emission efficiency is improved.

"Base material"
The organic EL element of the present invention is preferably formed on a substrate (hereinafter also referred to as a substrate, a substrate, a support, a film, etc.).

  The substrate that can be used in the organic EL device of the present invention is not particularly limited in the type of glass, plastic, and the like, and is not particularly limited as long as it is transparent. Glass, quartz, and a transparent film can be mentioned. A particularly preferable substrate is a transparent film that can give flexibility to the organic EL element.

  Specifically, homopolymers or copolymers such as ethylene, polypropylene and butene, polyolefin (PO) resins such as copolymers, amorphous polyolefin resins (APO) such as cyclic polyolefins, polyethylene terephthalate (PET), Polyester resins such as polyethylene 2,6-naphthalate (PEN), polyamide (PA) resins such as nylon 6, nylon 12, copolymer nylon, polyvinyl alcohol (PVA) resin, ethylene-vinyl alcohol copolymer (EVOH) Polyvinyl alcohol resins such as polyimide (PI) resin, polyetherimide (PEI) resin, polysulfone (PS) resin, polyethersulfone (PES) resin, polyetheretherketone (PEEK) resin, polycarbonate (PC) resin , Polyvini Butyrate (PVB) resin, polyarylate (PAR) resin, ethylene-tetrafluoroethylene copolymer (ETFE), ethylene trifluoride chloride (PFA), ethylene tetrafluoride-perfluoroalkyl vinyl ether copolymer (FEP) Fluorine-based resins such as vinylidene fluoride (PVDF), vinyl fluoride (PVF), and perfluoroethylene-perfluoropropylene-perfluorovinyl ether-copolymer (EPA) can be used.

  In addition to the resins listed above, a resin composition comprising an acrylate compound having a radical-reactive unsaturated compound, a resin composition comprising an acrylate compound and a mercapto compound having a thiol group, epoxy acrylate, urethane acrylate, It is also possible to use a photocurable resin such as a resin composition in which an oligomer such as polyester acrylate or polyether acrylate is dissolved in a polyfunctional acrylate monomer, and a mixture thereof. Furthermore, it is also possible to use as a substrate film a laminate of one or more of these resins by means such as laminating or coating.

  These materials can be used alone or in combination as appropriate. Above all, ZEONEX and ZEONOR (manufactured by ZEON CORPORATION), amorphous cyclopolyolefin resin film ARTON (manufactured by JSR Corporation), polycarbonate film Pure Ace (manufactured by Teijin Limited), Konicatac of cellulose triacetate film Commercially available products such as KC4UX and KC8UX (manufactured by Konica Minolta Opto Co., Ltd.) can be preferably used.

  In addition, the base material according to the present invention using the above-described resins or the like may be an unstretched film or a stretched film.

  The base material according to the present invention can be produced by a conventionally known general method. For example, an unstretched substrate that is substantially amorphous and not oriented can be produced by melting a resin as a material with an extruder, extruding it with an annular die or a T-die, and quenching. In addition, the unstretched base material is subjected to a known method such as uniaxial stretching, tenter-type sequential biaxial stretching, tenter-type simultaneous biaxial stretching, tubular-type simultaneous biaxial stretching, or the flow direction of the base material (vertical axis), or A stretched substrate can be produced by stretching in the direction perpendicular to the flow direction of the substrate (horizontal axis). The draw ratio in this case can be appropriately selected according to the resin as the raw material of the base material, but is preferably 2 to 10 times in each of the vertical axis direction and the horizontal axis direction.

  Moreover, in the base material which concerns on this invention, you may perform surface treatments, such as a corona treatment, a flame treatment, a plasma treatment, a glow discharge process, a roughening process, a chemical treatment, before forming a vapor deposition film.

  Furthermore, you may form an anchor coating agent layer in the base-material surface based on this invention for the purpose of the adhesive improvement with a vapor deposition film. Examples of the anchor coating agent used in this anchor coating agent layer include polyester resins, isocyanate resins, urethane resins, acrylic resins, ethylene vinyl alcohol resins, vinyl modified resins, epoxy resins, modified styrene resins, modified silicon resins, and alkyl titanates. Can be used alone or in combination. Conventionally known additives can be added to these anchor coating agents.

The above-mentioned anchor coating agent is coated on the substrate by a known method such as roll coating, gravure coating, knife coating, dip coating, spray coating, etc., and anchor coating is performed by drying and removing the solvent, diluent, etc. Can do. The application amount of the anchor coating agent is preferably about 0.1 to 5 g / m ² (dry state).

  The substrate is conveniently a long product wound up in a roll. Since the thickness of the base material varies depending on the use of the film to be obtained, it cannot be specified unconditionally. However, when the film is used for packaging, it is not particularly limited, and is 3 to 400 μm from the suitability as a packaging material. It is preferable to be in the range of 6 to 30 μm.

  Moreover, as for the base material used for this invention, 10-200 micrometers is preferable as a film thickness of a film-shaped thing, More preferably, it is 50-100 micrometers.

<Display device>
The organic EL device of the present invention may be used as a kind of lamp such as an illumination or exposure light source, a projection device that projects an image, or a display device that directly recognizes a still image or a moving image. (Display) may be used. The driving method when used as a display device for moving image reproduction 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 two or more organic EL elements of the present invention having different emission colors.

《Light extraction technology》
In the organic EL device of the present invention, in order to improve the extraction efficiency of light emitted from the light emitting layer, a prism or lens-like process is applied to the surface of the substrate, or a prism sheet or a lens sheet is attached to the surface of the substrate. Also good.

  The organic EL device of the present invention may have a low refractive index layer between the electrode and the substrate. Examples of the low refractive index layer include aerogel, porous silica, magnesium fluoride, and a fluorine-based polymer.

  Since the refractive index of the substrate is generally about 1.5 to 1.7, the low refractive index layer preferably has a refractive index of about 1.5 or less. Furthermore, it is preferable that it is 1.35 or less. The thickness of the low refractive index medium is preferably at least twice the wavelength in the medium. This is because the effect of the low refractive index layer is diminished when the thickness of the low refractive index medium is about the wavelength of light and the electromagnetic wave that has exuded by evanescent enters the substrate.

  The organic EL element of the present invention may have a diffraction grating in any layer or in a medium (in a transparent substrate or a transparent electrode). It is desirable that the diffraction grating to be introduced has a two-dimensional periodic refractive index. This is because light emitted from the light-emitting layer is randomly generated in all directions, so in a general one-dimensional diffraction grating having a periodic refractive index distribution only in a certain direction, only light traveling in a specific direction is diffracted. Therefore, the light extraction efficiency does not increase so much. However, by making the refractive index distribution a two-dimensional distribution, light traveling in all directions is diffracted, and light extraction efficiency is increased. As described above, the position where the diffraction grating is introduced may be in any of the layers or in the medium (in the transparent substrate or the transparent electrode), but is preferably in the vicinity of the organic light emitting layer where light is generated. At this time, the period of the diffraction grating is preferably about 1/2 to 3 times the wavelength of light in the medium. The arrangement of the diffraction grating is preferably two-dimensionally repeated such as a square lattice, a triangular lattice, or a honeycomb lattice.

  The substrate according to the present invention preferably has a gas barrier layer. Thereby, it has the further improvement effect of the aging stability in a dark spot and high temperature and high humidity.

《Gas barrier layer》
The composition of the gas barrier layer according to the present invention is not particularly limited as long as it is a layer that blocks permeation of oxygen and water vapor. The oxygen permeability is preferably 0.005 ml / m ² / day or less at 23 ° C. and 0% RH, and the water vapor permeability measured according to the JIS K7129 B method is preferably 0.1 g / m ² / day or less. Specifically, an inorganic oxide is preferable as the material constituting the gas barrier layer according to the present invention, and examples include silicon oxide, aluminum oxide, silicon oxynitride, aluminum oxynitride, magnesium oxide, zinc oxide, indium oxide, and tin oxide. be able to.

  Further, the thickness of the gas barrier layer in the present invention is appropriately selected depending on the type and configuration of the material used, and is suitably selected, but is preferably in the range of 5 to 2000 nm. This is because when the thickness of the gas barrier layer is thinner than the above range, a uniform film cannot be obtained, and it is difficult to obtain a barrier property against gas. When the thickness of the gas barrier layer is larger than the above range, it is difficult to maintain the flexibility of the gas barrier film, and the gas barrier film is cracked due to external factors such as bending and pulling after film formation. This is because it may occur.

  The gas barrier layer according to the present invention is formed by spraying a raw material, which will be described later, a spray method, a spin coating method, a sputtering method, an ion assist method, a plasma CVD method, which will be described later, a plasma CVD method, which will be described later, at atmospheric pressure or near atmospheric pressure Can be formed by applying.

  FIG. 1 is an example showing the configuration of a substrate having a gas barrier layer according to the present invention.

  The structure and density of the substrate having the gas barrier layer according to the present invention will be described. The gas barrier layer 21 according to the present invention has a structure in which layers having different densities are laminated on a base material 22 and an adhesion film 23, a ceramic film 24, and a protective film 25 are laminated. FIG. 1 shows an example in which three layers are stacked. The density distribution in each layer is uniform, and the density of the ceramic film is set higher than the densities of the adhesion film and the protective film positioned above and below the ceramic film. Although each layer is shown as one layer in FIG. 1, it may have a configuration of two or more layers as necessary.

  As a method for forming an adhesion film, a ceramic film and a protective film on a substrate, a spray method, a spin coating method, a sputtering method, an ion assist method, a plasma CVD method, or a plasma CVD under a pressure at or near atmospheric pressure. It can be formed by applying a law or the like.

  Hereinafter, although an example explains the present invention, the present invention is not limited to this.

Example 1
[Production of Organic EL Element OLED1-1]
(A) Preparation of transfer material A On one side of a support of polyethersulfone (manufactured by Sumitomo Bakelite Co., Ltd., thickness 188 μm), a polymer of the following exemplary compound A15, phosphorescent compound 1-1 (mass ratio 100) : 5) and a fluid containing dichloroethane were applied using a bar coater and dried at room temperature to prepare a transfer material A in which a light-emitting layer having a thickness of 40 nm was formed on a support.

(B) Production of transfer material B On one side of a support of polyethersulfone (manufactured by Sumitomo Bakelite Co., Ltd., thickness: 188 μm), a fluid containing the following polymer of exemplified compound A28 and dichloroethane was used using a bar coater. By applying and drying at room temperature, a transfer material B in which an electron transport layer having a thickness of 40 nm was formed on a support was produced.

(C) Production of Substrate 1 Having Gas Barrier Layer As a substrate, on a polyethylene naphthalate film having a thickness of 100 μm (a film made by Teijin-Deupon, hereinafter abbreviated as PEN), the following atmospheric pressure plasma discharge treatment apparatus and discharge conditions Thus, a substrate 1 having a gas barrier layer with the profile configuration shown in FIG. 1 was produced.

(Atmospheric pressure plasma discharge treatment equipment)
Using the atmospheric pressure plasma discharge treatment apparatus of FIG. 2, a set of a roll electrode covered with a dielectric and a plurality of rectangular tube electrodes was produced as follows.

  The roll electrode serving as the first electrode is coated with a high-density, high-adhesion alumina sprayed film by an atmospheric plasma method on a jacket roll metallic base material made of titanium alloy T64 having cooling means by cooling water, and roll diameter It was set to 1000 mmφ. On the other hand, the square electrode of the second electrode is a hollow rectangular tube-shaped titanium alloy T64 covered with 1 mm of the same dielectric material with the same thickness under the same conditions, and the opposing rectangular tube-shaped fixed electrode group and did.

Ten square tube electrodes were arranged around the roll rotating electrode with a counter electrode gap of 1 mm. The total discharge area of the rectangular tube type fixed electrode group was 150 cm (length in the width direction) × 4 cm (length in the transport direction) × 10 (number of electrodes) = 6000 cm ² . In all cases, appropriate filters were installed.

  During plasma discharge, the first electrode (roll rotating electrode) is kept at a temperature of 120 ° C. and the second electrode (square tube fixed electrode group) is adjusted to 80 ° C., and the roll rotating electrode is rotated by a drive to form a thin film. went. Among the 10 rectangular tube-shaped fixed electrodes, two from the upstream side are used for forming the following first layer (adhesion layer), and the following six are used for forming the following second layer (ceramic layer). The following two were used for film formation of the third layer (protective layer), each condition was set, and three layers were laminated in one pass.

(First layer: adhesion layer)
Plasma discharge was performed under the following conditions to form an adhesion layer having a thickness of about 50 nm.

<Gas conditions>
Discharge gas: Nitrogen gas 94.5% by volume
Thin-film forming gas: Hexamethyldisiloxane (vaporized by mixing with nitrogen gas with a vaporizer manufactured by Lintec) 0.5% by volume
Additive gas: Oxygen gas 5.0% by volume
<Power supply conditions: Only the power supply on the first electrode side was used>
1st electrode side Power supply type
Frequency 80kHz
Output density 10W / cm ²
The density of the formed first layer (adhesion layer) was 1.90 as a result of measurement by the X-ray reflectivity method using MXP21 manufactured by MacScience.

(Second layer: Ceramic layer)
Plasma discharge was performed under the following conditions to form a ceramic layer having a thickness of about 30 nm.

<Gas conditions>
Discharge gas: Nitrogen gas 94.9% by volume
Thin film forming gas: Hexamethyldisiloxane (vaporized by mixing with nitrogen gas using a vaporizer manufactured by Lintec) 0.1% by volume
Additive gas: Oxygen gas 5.0% by volume
<Power supply conditions>
1st electrode side Power supply type
Frequency 80kHz
Output density 10W / cm ²
Second electrode side Power supply type High frequency power supply manufactured by Pearl Industrial Co., Ltd.
Frequency 13.56MHz
Output density 10W / cm ²
The density of the formed second layer (ceramic layer) was 2.20 as a result of measurement by the X-ray reflectivity method using MXP21 manufactured by Mac Science.

(3rd layer: protective layer)
Plasma discharge was performed under the following conditions to form a protective layer having a thickness of about 200 nm.

<Gas conditions>
Discharge gas: Nitrogen gas 93.0% by volume
Thin-film forming gas: Hexamethyldisiloxane (vaporized by mixing with nitrogen gas using a vaporizer manufactured by Lintec) 2.0% by volume
Additive gas: Oxygen gas 5.0% by volume
<Power supply conditions: Only the power supply on the first electrode side was used>
1st electrode side Power supply type
Frequency 80kHz
Output density 10W / cm ²
The density of the formed third layer (protective layer) was 1.95 as a result of measurement by the X-ray reflectivity method using MXP21 manufactured by MacScience.

As a result of measuring the water vapor transmission rate by a method based on JIS-K-7129B, it was 10 ⁻³ g / m ² / day or less. As a result of measuring the oxygen transmission rate by a method based on JIS-K-7126B, it was 10 ⁻³ g / m ² / day or less.

Next, after patterning a substrate having a 120 nm film of ITO (indium tin oxide) on the substrate 1 having a gas barrier layer, the substrate with the ITO transparent electrode was ultrasonically cleaned with isopropyl alcohol and dried with nitrogen gas. Dried and UV ozone cleaned for 5 minutes. The ITO substrate 100 was manufactured by fixing to a substrate holder of a commercially available vacuum deposition apparatus and reducing the pressure to 4 × 10 ⁻⁴ Pa.

  Further, as shown in FIG. 3, using a commercially available inkjet head 10 (KM512S non-aqueous head manufactured by Konica Minolta), a fluid D containing polymer of the following exemplary compound A7 and THF is discharged onto the ITO substrate 100. Thus, a substrate A on which a hole transport layer having a thickness of 50 nm was formed was produced.

(D) Production of organic EL element The light emitting layer side of the transfer material A is superimposed on the upper surface of the hole transport layer of the substrate A, and a pair of rollers (one of which has a pressure of 0.3 MPa from the support side of the transfer material A) 155 ° C. heating roller) at a speed of 0.05 m / min, pressurizing while heating from the support side of the transfer material A, and peeling the support to emit light on the upper surface of the hole transport layer A layer was formed.

  Furthermore, the electron transport layer side of the transfer material B is overlapped on the upper surface of the light emitting layer, and a gap between a pair of rollers (one heating roller at 155 ° C.) with a pressure of 0.3 MPa from the temporary support side of the transfer material B is 0. The electron transport layer was formed on the upper surface of the light-emitting layer by applying pressure at a rate of 0.05 m / min while applying pressure from the support side of the transfer material B while heating and peeling the support.

  Next, 200 nm-thick aluminum (cathode) was deposited on the electron transport layer. Furthermore, the base material 1 which has a gas barrier layer was affixed on it, and organic EL element OLED1-1 was formed.

(Synthesis of Polymer of Exemplary Compound A15)
Illustrated compound A15, 1.34 g (2.5 mmol), 2,2′-azobis (isobutyronitrile) (AIBN) 0.010 g (0.061 mmol), and 30 ml of butyl acetate were substituted into the reaction vessel for nitrogen substitution. And then reacted at 80 ° C. for 10 hours. After the reaction, it was poured into acetone for reprecipitation, and the polymer was recovered by filtration. The recovered polymer chloroform solution is purified by adding it to methanol and reprecipitating twice, and after recovery, vacuum drying is performed to obtain 1.20 g of the target polymer of Exemplified Compound A15 as a powder. It was.

  The copolymer had a weight average molecular weight of 10,000 in terms of polystyrene (according to GPC measurement using HFIP (hexafluoroisopropanol) as an eluent).

  In the same manner, a polymer of Exemplified Compound A7 (weight average molecular weight 36000) and a polymer of Exemplified Compound A28 (weight average molecular weight 26000) were synthesized.

[Production of Organic EL Elements OLED1-2 to 1-11]
In the manufacturing method of the organic EL element OLED1-1, the organic EL element OLED1-2 is manufactured by the same manufacturing method as the manufacturing method of the organic EL element OLED1-1 except that the combination of the materials of the transfer material A is changed as shown in Table 1. ˜1-11 were prepared.

[Production of Organic EL Element OLED1-12]
(A) Production of bonded substrate A A 200 nm thick aluminum (cathode) is deposited on the substrate 1 having a gas barrier layer, and a fluid containing the polymer of the exemplified compound A28 and dichloroethane is applied to a bar coater. The laminated base material A which formed the 40-nm-thick electron carrying layer on the support body was produced by apply | coating and drying at room temperature.

(B) Preparation of organic EL element Similar to the organic EL element OLED1-1, the light emitting layer side of the transfer material A is overlapped on the upper surface of the hole transport layer of the substrate A, and further 0.3 MPa from the support side of the transfer material A. By passing through a pair of rollers (one heated roller at 155 ° C.) at a speed of 0.05 m / min, pressure is applied while heating from the support side of the transfer material A, and the support is peeled off. Thus, a light emitting layer was formed on the upper surface of the hole transport layer.

  Furthermore, the electron transport layer side of the bonding substrate A is overlapped on the upper surface of the light emitting layer, and a pair of rollers (one is a heating roller at 155 ° C.) with a pressure of 0.3 MPa from the support side of the bonding substrate A. The organic EL element OLED1-12 was produced by passing between them at a speed of 0.05 m / min and bonding them.

[Production of Organic EL Element OLED1-13]
In the manufacturing method of the organic EL element OLED1-1, the manufacturing method is the same as the manufacturing method of the organic EL element OLED1-1, except that the transfer was performed using a laser instead of the pair of rollers of the applied pressure. Thus, an organic EL element OLED1-13 was produced.

[Production of Organic EL Element OLED1-14]
In the manufacturing method of the organic EL element OLED1-12, the organic EL element OLED1-12 is manufactured by the same manufacturing method as that of the organic EL element OLED1-12 except that the combination of the materials of the transfer material A is changed as shown in Table 1. 14 was produced.

[Evaluation of organic EL elements]
The organic EL device obtained as described below was evaluated, and the results are shown in Table 2.

(Luminance brightness)
The emission luminance (cd / m ² ) of the organic EL device at a temperature of 23 ° C. and a 10 V DC voltage was measured. The light emission luminance was expressed as a relative value when the organic EL element OLED1-11 was set to 100. The light emission luminance was measured using CS-1000 (manufactured by Konica Minolta Sensing).

(Driving life)
Each organic EL element is driven at a constant current with a current that gives an initial luminance of 1000 cd / m ² under a constant condition of 50 ° C., and a time that is ½ of the initial luminance (500 cd / m ² ) is obtained. A measure of lifespan. In addition, 50 degreeC drive lifetime was represented by the relative value when the comparative organic EL element OLED1-11 is set to 100. FIG.

(Stability over time)
After the organic EL device was stored for 1 month at 60 ° C. and 70% Rh, the emission luminance (cd / m ² ) was measured in the same manner as in Example 1. The stability over time was expressed as a relative value with respect to the measured luminance value before storage.

(Dark spot)
Further, after driving for 30 hours at a constant current of 15 mA / cm ² , the number of non-luminous spots (dark spots) that can be visually confirmed in the range of 2 mm × 2 mm square was measured.

  The results obtained as described above are shown in the table below.

  As is clear from Table 2, dark spots were significantly reduced in the organic EL device using the method according to the present invention, the stability over time was improved, and the luminance and lifetime were also improved.

Example 2
A green light-emitting organic EL element produced in the same manner as in Example 1 except that the phosphorescent compound of the organic EL element OLED1-1 of the present invention produced in Example 1 was replaced with Ir-1, and the organic EL element OLED1-1 of the present invention. Except that the phosphorescent compound was replaced with Ir-9, the red light-emitting organic EL devices produced in the same manner were juxtaposed on the same substrate to produce an active matrix type full-color display device shown in FIG. FIG. 5 shows only a schematic diagram of the display portion A of the produced full-color display device. That is, it has a wiring portion including a plurality of scanning lines 5 and data lines 6 on the same substrate, and a plurality of pixels 3 juxtaposed (the 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 (for details, see FIG. 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, full-color display is possible by appropriately juxtaposing the red, green, and blue pixels.

  By driving the full-color display device, a clear full-color moving image display was obtained.

Example 3
<Production of lighting device>
The non-light-emitting surface of each of the blue, green, and red light emitting organic EL elements produced in Example 2 was covered with a glass case to obtain a lighting device. The lighting device has high luminous efficiency and can be used as a thin lighting device that emits white light with a long emission life. FIG. 6 is a schematic view of the lighting device, and FIG. 7 is a cross-sectional view of the lighting device. The organic EL element 101 was covered with a glass cover 102. Reference numeral 105 denotes a cathode, 106 denotes an organic EL layer, and 107 denotes a glass substrate with a transparent electrode. The glass cover 102 is filled with nitrogen gas 108 and a water catching agent 109 is provided.

  Subsequently, the color gamut when the color filter marketed for displays was combined was evaluated. It was confirmed that the combination of the lighting device and the color filter has a wide color reproduction range and excellent performance in color reproducibility.

It is a schematic diagram which shows the layer structure of the transparent gas barrier film which concerns on this invention. It is the schematic which shows an example of the atmospheric pressure plasma discharge processing apparatus of the system which processes a base material between counter electrodes useful for this invention. It is a figure which shows the discharge and film-forming process of organic EL element OLED1-1. It is the schematic diagram which showed an example of the display apparatus comprised from an organic EL element. It is a schematic diagram of a display part. It is the schematic of an illuminating device. It is sectional drawing of an illuminating device.

Explanation of symbols

30 Plasma discharge treatment chamber 35 Roll electrode 36 Electrode 41, 42 Power supply 51 Gas supply device 55 Electrode cooling unit 100 ITO substrate 111 Hole transport layer 112 Light emitting layer 113 Electron transport layer 114 Cathode 115 Gas barrier film 10 Inkjet head D Droplet 1 Display 3 Pixel 5 Scan line 6 Data line A Display unit B Control unit 107 Glass substrate with transparent electrode 106 Organic EL layer 105 Cathode 102 Glass cover 108 Nitrogen gas 109 Water trapping agent

Claims (12)

In an organic electroluminescence device having an electrode and at least two organic layers on a substrate, at least one of the organic layers is a light emitting layer containing a phosphorescent compound and a host compound, and the HOMO of the phosphorescent compound is -5. An organic electroluminescence device characterized in that the organic electroluminescence device has a thickness of .15 to -3.50 eV and a LUMO of -1.25 to +1.00 eV, and at least one of the organic layers is formed by transfer or bonding. 2. The organic electroluminescence device according to claim 1, wherein the phosphorescent compound has a HOMO of −4.80 to −3.50 eV and a LUMO of −0.80 to +1.00 eV. The organic phosphor element according to claim 1 or 2, wherein the phosphorescent compound is represented by the following general formula (1).

(In the formula, R ₁ represents a substituent. Z represents a group of nonmetallic atoms necessary to form a 5- to 7-membered ring. N1 represents an integer of 0 to _5. B _{1 to} B ₅ represent carbon. Represents an atom, nitrogen atom, oxygen atom or sulfur atom, at least one represents a nitrogen atom, M ₁ represents a group 8-10 metal in the periodic table, and X ₁ and X ₂ represent a carbon atom, nitrogen atom or Represents an oxygen atom, and L ₁ represents an atomic group forming a bidentate ligand together with X ₁ and X ₂ , m1 represents an integer of 1, 2 or 3, m2 represents an integer of 0, 1 or 2 (Where m1 + m2 is 2 or 3) The organic electroluminescent element according to claim 3, wherein m2 is 0 in the phosphorescent compound represented by the general formula (1). 5. The organic electroluminescent device according to claim 3, wherein in the phosphorescent compound represented by the general formula (1), the nitrogen-containing heterocycle formed by B _{1 to} B ₅ is an imidazole ring. . The organic electroluminescent element according to claim 1, wherein the light emitting layer is formed by transfer or bonding. The organic electroluminescent element according to claim 1, wherein the substrate has a gas barrier layer. The organic electroluminescent element according to claim 1, which emits blue light. The organic electroluminescence element according to claim 1, which emits white light. A display device comprising the organic electroluminescence element according to claim 1. An illuminating device comprising the organic electroluminescent element according to claim 1. 12. A display device comprising the illumination device according to claim 11 and a liquid crystal element as display means.

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