WO2003088721A1 - Dispositif organique a emission de champ et dispositif d'emission - Google Patents
Dispositif organique a emission de champ et dispositif d'emission Download PDFInfo
- Publication number
- WO2003088721A1 WO2003088721A1 PCT/JP2002/005366 JP0205366W WO03088721A1 WO 2003088721 A1 WO2003088721 A1 WO 2003088721A1 JP 0205366 W JP0205366 W JP 0205366W WO 03088721 A1 WO03088721 A1 WO 03088721A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- light emitting
- organic electroluminescent
- light
- compound
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
Definitions
- the present invention relates to an organic electroluminescent element (organic EL element) in which an organic layer having a light emitting region is provided between an anode and a cathode, and a light emitting device such as a display device using the same.
- organic EL element organic electroluminescent element
- the importance of the display as a human interface is increasing.
- a high-resolution, high-speed display that is easy on the eyes, easy to see on a high-definition screen, and allows videos to be seen clearly and without delay is required.
- Organic EL devices that use organic compounds as light-emitting materials have a wide viewing angle, high contrast, and excellent visibility.
- it since it is self-luminous and does not require a backlight like liquid crystal, it can be made thinner and lighter, and is said to be advantageous in terms of power consumption.
- Organic EL devices that use organic compounds as light-emitting materials have the characteristics of being able to be driven at low DC voltage, have a fast response speed, are resistant to vibration, and have a wide operating temperature range. Attention has been paid, and some commercialization has begun.
- An organic electroluminescent device using an organic light-emitting material has an organic electroluminescent device containing an organic light-emitting material between an anode and a cathode, at least one of which is light-transmissive.
- the light-emitting layer is sandwiched between the layers, and light emission occurs when a DC voltage is applied.
- FIGS. 10 to 12 show examples of conventional organic electroluminescent devices (organic EL devices), respectively.
- FIG. 10 shows an organic layer comprising a light-transmissive anode 6 such as ITO (Indium Tin Oxide), a hole transport layer 2 and an electron transport layer 4 on a substrate 10 such as translucent glass.
- the organic electroluminescent device has a single-hetero structure, which has a laminated structure in which a layer 15a and a cathode 7 are sequentially laminated, and the laminated structure is sealed with a protective layer 14.
- light emission 5 of a predetermined wavelength is generated from the interface between the hole transport layer 2 and the electron transport layer 4 by applying a DC voltage from the power supply 20.
- FIG. 11 shows that a light-transmitting anode 6, a hole injection layer 1, a hole transport layer 2, a light-emitting layer 3, and an electron transport layer 4 are provided on a light-transmitting substrate 10.
- This is an organic electroluminescent device having a double hetero structure, which has a laminated structure in which an organic layer 15 b made of a material and a cathode 7 are sequentially laminated, and the laminated structure is sealed with a protective layer 14.
- a DC voltage from the power source 20 between the anode 6 and the cathode 7 holes injected from the anode 6 were injected through the hole transport layer 2 and from the cathode 7.
- the electrons reach the light-emitting layer 3 via the electron transport layer 4 respectively.
- recombination of the electron Z holes occurs to generate a singlet exciton, and the singlet exciton generates light emission 5 having a predetermined wavelength.
- FIG. 12 is a configuration example of a flat panel display using the above-mentioned organic electroluminescent device.
- an organic layer 15 (15a, 15b) capable of emitting three primary colors of red (1, green (0) and blue (B)) is composed of a cathode 7 and an anode.
- the cathode 7 and the anode 6 can be provided in a stripe shape crossing each other, and are selected by a luminance signal circuit 24 and a control circuit 25 with a built-in shift register, respectively.
- a signal voltage is applied to the organic layer, whereby the organic layer at the position (pixel) where the selected cathode 7 and anode 6 intersect emits light.
- FIG. 1 An example of an element structure in which the light-emitting layer contains two or more kinds of materials is shown in FIG.
- the two-layer structure of the electron transport layer 4 and the hole transport layer 2, which also functions as layers, is described by C.. Tang, SA VanS lyke and CH Chen in J. of Appl. Phys. 65-9, 3610-3616 (1989 ), And a patent application (JP-A-63-264692) has been filed.
- the purpose of this prior art was to provide an electroluminescent device capable of producing light output at a lower applied voltage and in a wider range of possible wavelengths and exhibiting a high stability level.
- the light-emitting layer is composed of an organic host substance capable of sustaining both injection of holes and electrons, and a fluorescent substance capable of emitting light in response to hole-electron recombination. It is composed of substances.
- the hue of the emitted light is modified.
- the minimum percentage of fluorescent material sufficient to achieve this effect will vary with the particular choice of host and fluorescent material, but according to the above-described known techniques, in any case, the number of moles of host material must be reduced. It is described in the official gazette that it is not necessary to use about 10 mol% or more of a fluorescent substance as a standard, and it is almost unnecessary to use 1 mol% or more of a fluorescent substance.
- Table II of Example 7-13 showing the hue as a function of the density is shown in Table II as 41- (dicyanomethylene) -12-methyl-6- [2- (9 -Durolidyl) ethenyl]
- the luminous efficiency when the fluorescent substance is contained at 4.4 mol% is 0.14 when compared to the case where it is not contained at 1.0. is decreasing.
- the emission wavelength was 535 nm when no fluorescent substance was contained, but it became longer as the concentration of the fluorescent substance increased, and could reach 6900 nm when the concentration was 4.4 mol%. It is shown.
- the known techniques cited above have several advantages as compared to the case where the light emitting layer is composed of a single light emitting material.
- the light emitting layer 3 is a layer made of a single material, and If the material has electron transporting properties (Fig. 13), the region where light and electrons recombine efficiently (light emitting region) is the boundary between the hole transport layer and the light emitting layer.
- the material of the layer composed of a single material has a hole transporting property (Fig. 14)
- the light emitting region is near the interface adjacent to the electron transport layer in the light emitting layer. Focus on
- the present invention has been made to provide a novel and effective structure of a light-emitting layer for achieving the above-described object, and an organic layer having a light-emitting region is provided between an anode and a cathode.
- an organic electroluminescent device at least one of the constituent layers of the organic layer is
- a light-emitting material which exhibits electroluminescence by applying a voltage and has a charge transporting property when a voltage is applied between the anode and the cathode as a single thin film; and a charge transport for promoting charge injection into the light emitting material. Consisting of a mixed layer with a charge injection promoting material
- An organic electroluminescent device having a light emitting region not only at or near an interface with an adjacent layer, but also over a certain thickness region in the layer thickness direction from the interface or in the vicinity thereof;
- the present invention relates to a light emitting device using an element.
- an organic electroluminescent device comprising an anode, a hole transporting layer, a light emitting layer, an electron transporting layer, or an anode, a hole transporting layer, and a light emitting / electron transporting layer.
- a charge-transporting light-emitting material that emits electroluminescence when a DC voltage is applied while sandwiched as a single thin film, and has a charge-transporting ability to promote charge injection into this light-emitting material.
- Injection promoter The light-emitting region is formed by the mixed layer with the material, and the light-emitting region exists not only at or near the interface with the adjacent layer but also over a certain thickness region in the layer thickness direction.
- Light emission can be performed over a wide area of the light-emitting layer without being limited to the interface or its vicinity. (Even if a certain portion in the layer thickness direction deteriorates in performance, light emission occurs above or below the portion. This will occur over a certain thickness region of the light emitting layer). As a result, it is possible to greatly improve the element driving life.
- the luminescent material used in the present invention has a light emission derived from fluorescence as compared with the known technology described above (Japanese Patent Application Laid-Open No. 63-24692). The difference is that when a single thin film is sandwiched between the cathodes, it itself emits electroluminescence when a DC voltage is applied. That is, since the light emitting material itself has electroluminescent properties and charge transporting properties, there is no need for a material corresponding to a host material for maintaining the injection of holes and electrons in the light emitting layer. Rather than emitting light in response to hole-electron recombination, it has the ability to emit light by recombination of holes and electrons by itself. Therefore, depending on the concentration of the light emitting material, the hue and the luminous efficiency do not change so much, and a stable hue can be obtained. BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a diagram showing an energy level and a light emission mechanism of each layer of the organic electroluminescent device according to the present invention.
- FIG. 2 is a similar schematic view of another organic electroluminescent device.
- FIG. 3 is a similar schematic diagram of another organic electroluminescent device.
- FIG. 4 is a similar schematic view of the same and still another organic electroluminescent device.
- FIG. 5 is a light emission spectrum diagram of an organic electroluminescent device according to a comparative example.
- FIG. 6 is a light emission spectrum diagram of the organic electroluminescent device according to the present invention. You.
- FIG. 7 is a schematic cross-sectional view of an organic electroluminescent device used for measuring a light emitting region.
- FIG. 8 is a spectrum diagram showing the correspondence between the actually measured emission spectrum and the emission spectrum predicted from the emission distribution in the light emitting layer. It is a spectrum diagram which shows the light emission distribution in a layer.
- FIG. 10 is a schematic sectional view of a main part of a conventional organic electroluminescent device.
- FIG. 11 is a schematic cross-sectional view of a main part of another organic electroluminescent device.
- FIG. 12 is a configuration diagram of a full-color flat display using the organic electroluminescent device.
- FIG. 13 is a schematic diagram showing the energy level and light emission mechanism of each layer of the organic electroluminescent device.
- FIG. 14 is a similar schematic view of another organic electroluminescent device. BEST MODE FOR CARRYING OUT THE INVENTION
- the emission intensity from each interface or both interfaces between the mixed layer and the electron transport layer and the hole transport layer adjacent thereto is equidistant from each of the interfaces. It is desirable that the light emission intensity at the position is 25% or more. Such a light-emitting region is preferably present over the entire thickness of the mixed layer.
- the concentration range of the light emitting material with respect to the charge injection promoting material having a charge transporting property for promoting charge injection into the light emitting material in the light emitting layer is 5 to 90% by mole (about 5 to 90% by weight). ), More preferably 10 to 90 mol% (approximately 10 to 90% by weight).
- the charge injection promoting material having charge transporting property for promoting charge injection included in the light emitting layer is (1) at least unoccupied.
- the energy level of the molecular orbital (LUMO) is the same or smaller (shallower) than that of the luminescent material, or the energy level of the highest occupied molecular orbital (HOMO) is lower than that of the luminescent material. However, it is desirable that they are the same or larger (deep).
- the energy level of the lowest unoccupied molecular orbital (LUMO) is the same or smaller than that of the luminescent material, and the energy level of the highest occupied molecular orbital (HOMO) is lower than that of the luminescent material. In comparison, it is desirable to be the same or larger.
- the same material as that used for the electron transport layer is used as a material having charge transport performance to promote charge injection into the luminescent material.
- the same material as that used for the hole transport layer can be used as the material having charge transport performance for promoting charge injection into the light emitting material.
- the same material as the material used for the electron transport layer and the material used for the hole transport layer are used as the material having the charge transport performance for promoting the charge injection into the light emitting material. Both the same and the same materials can be used.
- hole transport adjacent to the mixed layer Preferably, the energy level of the lowest unoccupied molecular orbital (LUMO) of the layer is shallower than those of the luminescent material and the charge injection promoting material.
- LUMO lowest unoccupied molecular orbital
- the organic electroluminescent device of the present invention In the organic electroluminescent device of the present invention, one or both of the electrons injected from the cathode and the holes injected from the anode concentrate on the interface of the organic layer Z and the organic layer, and the electrons and holes recombine.
- the light-emitting material efficiently acts as a trap for electrons and holes in the material having charge transport ability in the light-emitting layer, and recombination occurs in the light-emitting material. It is to obtain light emission.
- the light emitting region has a feature that it is not concentrated near the interface of the organic layer / organic layer but spreads widely in the light emitting layer, so that the light emitting material exists alone in the light emitting layer. In comparison, the reliability of the device is greatly improved. This means that concentration of the charge density in the light emitting layer promotes device deterioration.
- the light-emitting layer is a layer 3 composed of a single material, and (A) when the material has electron transport performance (FIG. 13), A region (light emitting region) where holes and electrons efficiently recombine 8 is concentrated near the interface in contact with the hole transport layer 2 in the light emitting layer 3, and (B) is composed of a single material.
- the material of the light emitting layer 3 has a hole transporting property (FIG. 14)
- the light emitting region is concentrated in the light emitting layer 3 near the interface in contact with the electron transport layer 4.
- a case where a layer in which a light emitting material having an electron transporting property is mixed with (C) a charge injection promoting material 18 having an electron transporting property is used as the light emitting layer (Fig. 1) and (D)
- a layer in which a light-emitting material having hole transport performance is mixed with the charge injection promoting material 18 having hole transport performance is used (Fig. 2)
- a region (light-emitting region) in which holes and electrons efficiently recombine 19 efficiently spreads to some extent in the light-emitting layer (in a constant thickness region in the layer thickness direction) from the interface.
- (Fig. 3) a layer in which a luminescent material is mixed
- the electron and hole densities were dispersed in the light-emitting layer (in the enlarged thickness region) without concentrating only near the interface between the organic layer and the organic layer.
- recombination of holes and electrons 19 also occurs in a wide area dispersed in the light emitting layer.
- the degradation of the device does not occur intensively at one location in the light emitting layer, but rather over a wide area.
- the lifetime of the device is prolonged and high reliability is obtained.
- the distribution of the light emitting region in the light emitting layer varies depending on the voltage value, current value, and light emission luminance applied to the element. Both the interface in contact with the layer and / or the interface in contact with the electron transport layer of the light emitting layer, and the position of the light emitting intensity from one of them is equidistant from each interface at both ends of the light emitting layer, that is, the center of the light emitting layer It is desirable that the light emission intensity at the portion is 25% or more. As described above, by effectively utilizing the entire thickness region of the light emitting layer as the light emitting region, the reliability of the device can be significantly improved.
- the charge injection promoting material is not only used in the electron transport performance but also in the above (E). Also, it may have hole transport performance.
- the light emitting material may have not only the hole transporting property but also the electron transporting property.
- the charge injection promoting material may have not only a hole transporting property but also an electron transporting property.
- the luminescent material may have not only an electron transporting property but also a hole transporting property.
- the organic electroluminescent device of the present invention may constitute a display device used for at least a part of a pixel.
- FIG. 10 shows an element structure including an anode 6, a hole transport layer 2, a light emitting / electron transport layer 4, and a cathode 7.
- FIG. 11 shows an anode 6, and a hole injection layer 1 as necessary. It has an element structure composed of a hole transport layer 2, a light emitting layer 3, an electron transport layer 4, and a cathode 7, all of which are applicable to the present invention, as shown in FIGS. 1 to 4.
- the light emitting layer is mixed with a charge (electron or hole) injection promoting material.
- the substrate 10 for supporting the organic electroluminescent device is in contact with the anode 6 or the cathode 7.
- a light-transmitting substrate such as glass, quartz, plastic, or the like, a substrate such as silicon having no light transmission in a visible light region, a substrate having a thin film transistor circuit formed on the surface thereof, or the like is used for the purpose of the element. They can be used together.
- Light emitted from the light emitting / electron transport layer 4 or the light emitting layer 3 can be extracted to the outside by imparting light transmittance to at least one of the anode 6 and the cathode 7.
- the material used for the anode 6, I TO (Indium Tin Oxide ), S n0 2 C r, P d, I n, Au, W, a metal or an alloy containing those such as N i can be used appropriately.
- active metals such as Li, Mg, and Ca, or alloys with metals such as Ag, Al, and In containing these metals can be used.
- a structure in which the above metal layers are stacked may be employed.
- a hole injection layer 1 for promoting hole injection can be provided between the anode 6 and the hole transport layer 2.
- a porphyrin compound described in U.S. Pat. No. 4,702,432 can be used.
- the hole transporting layer may have a laminated structure instead of a single layer.
- the constituent materials of the electron transport layer and the hole transport layer can be appropriately selected from known materials. Further, in order to facilitate electron injection from the cathode 7 to the originating Mitsukane electron transport layer and an electron transporting layer may be inserted a thin layer of such I_ ⁇ 2 palm L i F. Further, when holes are injected from the light emitting layer into the electron transport layer, a hole blocking layer may be provided for the purpose of preventing the injection.
- Useful examples of the light-emitting material to be included in the light-emitting layer include, for example, JP-A-11-329730, JP-A-11-329731, JP200-91 No. 07, JP 2000- 1 7 3 7 7 3, JP 2000-122 222, JP 2000-122 222, JP 2000- No. 122226, JP200-122222, JP200-122288, JP20019093, JP200 — 91074, JP200-091075, JP200-173737, JP2011-1070570, JP There is a compound having a styryl or distyryl structure described in JP 2001-111507 A1 in the molecular skeleton.
- These materials have an ability to form an amorphous thin film, which is a prerequisite of the present invention, and emit electroluminescence by applying a DC voltage while sandwiched between an anode and a cathode as a single thin film.
- a material having a charge transporting property for promoting charge injection into a luminescent material charge injection promoting material
- a material selected from commonly used electron transporting materials and hole transporting materials is appropriately used.
- Example 1 Concentration of Compound 1 and Luminous Efficiency
- Example 1 an organic electroluminescent device using a mixed layer of the following styryl compound of Compound 1 and the following A 1 Q 3 (tris (8-quinolinol) aluminum) as an electron transporting light emitting layer was manufactured. This is an example of examining the relationship between the light emission luminance and the light emission efficiency.
- a mixed layer of a styryl compound of Compound 1 and A 1 Q 3 as an electron transport material was formed as a light emitting layer by a vacuum evaporation method, and an organic electroluminescent device was manufactured.
- the substrate was a glass substrate, the anode was IT ⁇ , the hole transport layer was ⁇ -NPD shown below, and the cathode was Mg-Ag.
- [] indicates a film thickness (the same applies hereinafter).
- Table 1 Relationship between concentration of compound 1 in light emitting layer and luminous efficiency Concentration of compound 1 in light emitting layer 1 cd / m 2 10 cd / m 2 ′ 100 cd / m 2 1000 cd / m 2 device (1-1) 10% by weight 2.35 cd / A 2.36 cd / A 2.30 cd / A 2.24cd / A element (1-2) 30% by weight 2.33cd / A 2.34cd / A 2.23cd / A 2.09cd / A Element (1-3) 50% by weight 2.33cd / A 2.33cd / A 2.32cd / A 2.12cd / A element (1-4) 80% by weight 2.32cd / A 2.33cd / A 2.31cd / A 2.
- the devices (1-1) and (1-1) according to the present invention can be used in a practical luminance range (1 to 100 cd / m 2 ).
- the luminous efficiencies of 2), (1-3), (1-4) and (1-5) are all high and stable luminous efficiencies. In these devices, the concentration quenching caused by the luminescent material at high concentrations This indicates that there is no problem.
- an organic electroluminescent device was manufactured using a mixed layer of the styryl compound of the above compound 1 and the above ⁇ -NPD as a hole transporting light emitting layer. It is an example of examining
- an organic electroluminescent device was manufactured using a mixed layer of the following styryl compound of Compound 2 and A 1 Q 3 (tris (8-quinolinol) aluminum) as an electron-transporting light-emitting layer.
- a 1 Q 3 tris (8-quinolinol) aluminum
- Table 3 shows the relationship between the luminous efficiency and the luminous efficiency of the organic electroluminescent devices (3_1), (3-2), (3-3), (3-4) and (3-5) fabricated as described above. Show. The luminous efficiency was obtained as a ratio of the luminance to the current value.
- Example 1 an organic electroluminescent device was manufactured using a mixed layer of the styryl compound of Compound 2 and the a-NPD as a hole-transporting light-emitting layer, and the relationship between the light emission luminance and light emission efficiency was investigated. This is an example.
- a mixed layer of a styryl compound of compound 2 and ⁇ -NPD as a hole transport material was formed as a light emitting layer by a vacuum evaporation method, and the other steps were the same as in Example 1 to obtain an organic electroluminescent device. Produced.
- Example 5 Concentration and emission chromaticity of Compound 1
- an organic electroluminescent device was manufactured using a mixed layer of the styryl compound of the above compound 1 and the above A 1 Q 3 as an electron transporting light emitting layer, and the emission luminance and emission chromaticity of the organic electroluminescent device were measured. This is an example of examining the relationship.
- Example 1 a mixed layer of a styryl compound of Compound 1 and A 1 Q 3 as an electron transport material was formed as a light emitting layer by a vacuum evaporation method, and the organic electroluminescent device (1 (1), (1-2), (1-3), (1-4) and (1-5) were prepared.
- Table 5 shows the relationship between the emission luminance and chromaticity of these devices.
- an organic electroluminescent device was fabricated using a mixed layer of the styryl compound of Compound 1 above and the above Q! _NPD as a hole-transporting light-emitting layer. Relationship between the light emission luminance and light emission chromaticity This is an example of examining.
- Example 2 a mixed layer of a styryl compound of Compound 1 and _NPD as a hole transport material was formed as a light emitting layer by a vacuum evaporation method.
- Organic electroluminescent devices (2-1), (2-2), (2-3), (2-4) and (2-5) were fabricated. Table 6 below shows the relationship between the emission luminance and chromaticity of these devices.
- an organic electroluminescent device was manufactured using a mixed layer of the styryl compound of the above compound 2 and the above A 1 Q 3 as an electron transporting light emitting layer, and the emission luminance and emission chromaticity of the organic electroluminescent device were measured. This is an example of examining the relationship.
- Example 3 a mixed layer of a styryl compound of Compound 2 and A 1 Q 3 as an electron transport material was formed as a light emitting layer by a vacuum evaporation method, and the organic electroluminescent device (3 — 1), (3-2), (3-3), (3-4) and (3-5) were prepared.
- Table 7 shows the relationship between the emission luminance and chromaticity of these elements.
- Element (3-1) 10% by weight 0.645, 0.354 0.644, 0.355 0.643, 0.356 0.640, 0.359 Element (3-2) 30% by weight 0.651,0.348 0.650,0.349 0.648, 0.351 0.645, 0.354 Element (3-3) 50 weight % 0.652,0.348 0.651,0.350 0.650, 0.349 0.645,0.354 Element (3-4) 80% by weight 0.652, 0.347 0.653,0.347 0.651, 0.348 0.647, 0.352 Element (3-5) 90% by weight 0.652,0.347 0.652,0.347 0.651 , 0.348 0.646, according to 0.353 As a result, regardless of the concentration of the luminescent material, a practical luminance region (1 1 00 0 cd / m 2), element (3 1), (3 - 2), (3 - The chromaticities of 3), (3-4) and (3-5) were almost the same. 2 3% by weight of a low concentration of
- an organic electroluminescent element o was prepared using a mixed layer of the styryl compound of the above compound 2 and the above ⁇ -NPD as a hole transporting light emitting layer.
- Example 4 a mixed layer of a styrylated B compound of Compound 2 and _NPD as a hole transport material was formed as a light emitting layer by a vacuum evaporation method, and the organic electroluminescent device (4— 1), (4-2), (4-3), (4-4) and (4-1-5) 'were prepared.
- Table 8 shows the relationship between the emission luminance and chromaticity of these devices.
- an organic electroluminescent device was fabricated using a mixed layer of the styryl compound of the above compound 2 and the above A 1 Q 3 as an electron transporting light emitting layer, and its reliability was examined. is there.
- Example 3 a mixed layer of a styryl compound of Compound 2 and A 1 Q 3 as an electron transport material was formed as a light emitting layer by a vacuum evaporation method, and the organic electroluminescent device (3 — 3) was prepared.
- Example 11 1 Device Using Mixed Layer of Compound 3 and A 1 q 3 as Electron-Transporting Light-Emitting Layer
- an organic electroluminescent device was manufactured using a mixed layer of a styryl compound of the following compound 3 and the above A 1 Q 3 as an electron transporting light emitting layer, and the device characteristics were examined. is there.
- a mixed-layer of A 1 Q 3 is an electron transport material
- An organic electroluminescent device was manufactured by forming a light emitting layer.
- the mixing ratio of compound 3 in the mixed layer is 10% by weight (element (11-1)), 30% by weight (element (11-2)), 50% by weight (element (11-3)) ), 80% by weight (element (11-4)) and 90% by weight (element (11-5)).
- an organic electroluminescent device was manufactured using a mixed layer of a styryl compound of the following compound 4 and the above A 1 Q 3 as an electron transporting light emitting layer, and the device characteristics were examined. is there.
- an organic electroluminescent device was manufactured using a mixed layer of a styryl compound of Compound 4 and A 1 Q 3 as an electron transport material as a light emitting layer.
- the mixing ratio of compound 4 in the mixed layer is 10% by weight (element (12-1)), 30% by weight (element (12-2)), 50% by weight (element (12-3)) ), 80% by weight (element (12-4)), and 90% by weight (element (12-5)).
- This example is an example in which an organic electroluminescent device was manufactured using a mixed layer of the following styryl compound of compound 5 and the above-mentioned NPD as a hole transporting light emitting layer, and the device characteristics were examined.
- This example is an example in which an organic electroluminescent device was manufactured using a mixed layer of the following compound 6 and a_NPD as a hole-transporting light-emitting layer, and the device characteristics were examined.
- an element having the following layer configuration was produced on an ITO substrate by a vacuum evaporation method.
- the following BA lq bis (8-quinolinol) aluminum derivative
- Example 15 Device Using Mixed Layer of Compound 7 and ⁇ -NPD as Hole-Transport Emitting Layer
- an organic electroluminescent device was manufactured using a mixed layer of the following compound 7 and a-NPD as a hole-transporting light-emitting layer, and the device characteristics were examined.
- a mixed layer of the compound 7 and ⁇ -NPD as a hole transport material was formed as a light emitting layer by a vapor deposition method. Then, an organic electroluminescent device was produced.
- the mixing ratio of compound 7 in the mixed layer is 10% by weight (element (15_1)), 30% by weight (element (15_2)), 50% by weight (element (15-3)), Five types of 80% by weight (element (15-5)) and 90% by weight '(element (15-5)) were produced.
- Example 16 A mixed layer of compound 8 and ⁇ -NPD was used as a hole-transporting light-emitting layer. Element used for
- an organic electroluminescent device was manufactured using a mixed layer of the following compound 8 and ⁇ -NPD as a hole-transporting light-emitting layer, and the device characteristics were examined.
- Example 14 similarly to the devices (14-1) to (14-5) of Example 14, a mixed layer of the compound 8 and the H-NPD which is a hole transport material emits light by a vacuum evaporation method.
- the organic electroluminescent device was formed as a layer.
- Mixing ratio of compound 8 in the mixed layer is 10% by weight (element (16_1)), 30% by weight (element (16-1 2)), 50% by weight (element (16-3)) , 80% by weight (element (16-4)) and 90% by weight (element (16-5)).
- Both of these five elements show blue light emission in a practical luminance region from 1 0 ⁇ 5 0 0 c dZm 2 , to obtain a high luminous efficiency.
- the chromaticity did not change with an increase in luminance, indicating that it was useful as a display element.
- Example 17 Device using mixed layer of compound 9 and CBP as the light-emitting layer
- compound 9 shown below and CBP (4, 4'-N, N 'dicarbazoylbiphenyl shown below were used.
- an organic electroluminescent device was fabricated using
- an organic electroluminescent device was produced by a vacuum evaporation method using a mixed layer of the compound 9 and CBP as a light emitting layer.
- the mixing ratio of compound 9 in the mixed layer is 10% by weight (element (17-1)), 30% by weight (element (17-2)), 50% by weight (element (17-3)), 80% % (Element (17-4)) and 90% by weight (element (17-5)).
- Both of these five elements show blue light emission in a practical luminance region from 10 to 500 c DZM 2, to obtain a high luminous efficiency.
- the chromaticity did not change with an increase in luminance, indicating that it was useful as a display element.
- Example 18 Device Using Mixed Layer of Compound 10 and CBP as Emission Layer This example is an example in which an organic electroluminescent device was prepared using a mixed layer of the following compound 10 and CBP as a light emitting layer, and the device characteristics were examined.
- a mixed layer of the compound 10 and CBP was formed as a light-emitting layer by a vacuum evaporation method to produce an organic electroluminescent device. did.
- the mixing ratio of the compound 10 in the mixed layer is 10% by weight (element (18_1)), 30% by weight (element (18-2)), 50% by weight (element (18- 3)), 80% by weight (element (18-4)) and 90% by weight (element (18-5)) were prepared.
- Example 19 An element using a mixed layer of compound 11 and CBP as the light-emitting layer
- This example is an organic device using the mixed layer of compound 11 shown below and CBP as the light-emitting layer. This is an example in which an electroluminescent device was manufactured and its device characteristics were examined.
- a mixed layer of the compound 11 and CBP was formed as a light emitting layer by a vacuum evaporation method, and an organic electroluminescent device was manufactured. Produced.
- the mixing ratio of compound 11 in the mixed layer is 10% by weight (element (191-1)), 30% by weight (element (191-2)), 50% by weight (element (19-3) )), 80% by weight (element (19-4)), and 90% by weight (element (19-5)).
- Both of these five elements show blue light emission in a practical luminance region from 1 0 ⁇ 5 0 0 c dZm 2 , to obtain a high luminous efficiency.
- the chromaticity did not change with an increase in luminance, indicating that it was useful as a display element.
- Example 20 Device using mixed layer of compound 12 and CBP as light-emitting layer
- organic electroluminescence was performed using a mixed layer of compound 12 and CBP described above as a light-emitting layer. This is an example in which a device was fabricated and its device characteristics were examined.
- a mixed layer of the compound 12 and CBP was formed as a light emitting layer by a vacuum evaporation method, and the organic electroluminescent device was manufactured. Produced.
- the mixing ratio of compound 12 in the mixed layer is 10% by weight (element (20-1)), 30% by weight (element (20-2)), 50% by weight (element (20-3) )), 80% by weight (element (20-4)), and 90% by weight (element (20-5)).
- Both of these five elements show blue light emission in a practical luminance region from 1 0 ⁇ 5 00 c dZm 2, to obtain a high luminous efficiency.
- the chromaticity did not change with an increase in luminance, indicating that it was useful as a display element.
- an organic electroluminescent device was manufactured in the same manner as in Example 1 except that a single layer of the styryl compound 100% of the above compound 1 was used as a light emitting layer. This is an example of investigating its reliability.
- the chromaticity of the device (1-6) thus produced is shown in Table 9 below, and the devices (1-1), (1-2), (1-3), (1-3) shown in Example 5 are shown. It was almost the same as 1-4) and (1-1-5).
- an organic electroluminescent device was manufactured in the same manner as in Example 3 except that a single layer of the styryl compound 100% of the above-mentioned compound 2 was used as a light emitting layer, and the reliability of the organic electroluminescent device was examined. is there.
- an organic electroluminescent device was manufactured using a mixed layer of the styryl compound of the above compound 1 and the above A 1 Q 3 as an electron transporting light emitting layer, and the concentration of the compound 1 and the current density It is an example of examining the relationship between Z voltages.
- a styryl compound 1 a mixed layer of A 1 q 3 is an electron-transporting material is formed as a luminescent layer, other in the same manner as in Example 1 to an organic electroluminescent device ( 2 1—1), (2 1—2), (2 1—3), and (2 1—4) Were prepared.
- Example 22 Concentration of Compound 1, Luminous Efficiency, and Chromaticity
- the practical luminance range (1 In the case of 0 0 0 c dZm 2 ), the chromaticities of the elements (2 2-1), (2 2-2), (2 2-3) and (22-4) were almost the same. 2-3% by weight of a low concentration of dye A 1 q 3 normal which is doped in such red light emitting element to cause riel high intensity when the chromaticity change of problem, such found in elements of this embodiment I got it.
- Example 22 by a vacuum deposition method, light emission and styryl of compounds of Compound 1, a mixed layer of A 1 q 3 are alpha-NPD and the electron transport material is a hole transport material layer As a result, an organic electroluminescent device (22-3) was fabricated.
- This embodiment determines whether the light emitting region is concentrated near the interface in the light emitting layer or is dispersed throughout the light emitting layer by determining the photoexcited light emission spectrum of the light emitting material before and after the luminance degradation ( This is an example in which the change was measured by measuring the change in the intensity of the PL spectrum.
- the device of Example 3 had use 1 mixed layer of the light-emitting layer (3 3), compared with only Compound 2 to the light-emitting layer Example 2
- the PL spectrum intensity of the device in which the EL emission intensity was reduced by half from the initial state was examined.
- the element (3-3) When the EL emission intensity was halved, the PL spectrum intensity was halved to 50% of the initial luminance.
- the PL spectrum intensity was 70% of the initial state.
- the decrease in PL spectrum intensity will be at the same rate. It is thought that it decreases with. However, if a part of the light emitting layer is degraded with light emission, the decrease in PL spectrum intensity is considered to occur at a smaller rate than the decrease in EL emission intensity. From the above, in the element (3-3), almost the whole area in the light emitting layer is involved as the light emitting area, whereas in the element (3-6), only a part of the light emitting layer (organic The layer (the interface of the organic layer) was found to be a light emitting region.
- Figure 5 shows the EL emission spectrum of the device (3-6).
- the EL emission spectrum of Compound 2 has an emission maximum near 650 nm.
- slightly even emission of A 1 q 3 having an emission maximum around 5 2 0 nm was observed at the same time. Therefore, the element (3-6), and compound 2 alone of the light emitting layer, the interface at which light emission occurs between A 1 q 3 is an electron-transporting layer, the light emitting region is concentrated in the vicinity of the interface I understood that.
- the light interference effect between the light from the light-emitting interface and the reflected light from the aluminum electrode 37 indicates the output from the device.
- An element was fabricated with a film thickness condition that weakens light.
- ITO electrode 36 is 1 19 nm
- TNATA (4, 4,, 4 "tris (2-naphthylphenylamino) triphenylamine) layer 32 a is 40 nm
- EL022 ( Triphenylamine tetramer) layer 3 2b is 5 0 nm
- an aluminum two ⁇ beam The electrode 37 was formed, and the correspondence between the measured emission spectrum and the emission spectrum predicted from the emission distribution in the emission layer was examined.
- FIG. 8 shows the emission distribution 49 in the layer coincide with the current density 0. I mAZc m 2 at the time of driving the light emitting scan Bae spectrum, emission distribution 4 6 current density 1 MAZ cm 2 It was found that the emission spectrum coincided with the emission spectrum at the time of driving.
- FIG. 9 shows the light emission distribution in the light emitting layer used for the calculation.
- the light emitting spectrum is the difference between the hole transporting layer and the light emitting layer. It was verified that the distribution of the light emitting region where the light emission was large occurred at both the interface and the interface between the electron transport layer and the light emitting layer. In the case of the present example, it was found that the emission distribution on the hole transport layer side increased as the current density increased.
- a light-emitting region is formed by a mixed layer of a charge-transporting light-emitting material that emits electroluminescence upon application of a voltage and a charge injection-promoting material for promoting charge injection into the light-emitting material.
- this light-emitting region exists not only at the interface with the adjacent layer or in the vicinity thereof, but also over a certain thickness region in the layer thickness direction, light emission is not limited to the above-mentioned interface or its vicinity. Light emission can be performed over a wide area of the light-emitting layer, and the driving life of the device can be greatly improved. The color does not fluctuate and the performance stabilizes.
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electroluminescent Light Sources (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02730838A EP1511363A4 (en) | 2002-04-15 | 2002-05-31 | ORGANIC FIELD EMISSION DEVICE AND TRANSMISSION DEVICE |
US10/240,328 US20050064232A1 (en) | 2002-04-15 | 2002-05-31 | Organic field emission device and emission device |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-111659 | 2002-04-15 | ||
JP2002111659 | 2002-04-15 | ||
JP2002138212A JP2004006066A (ja) | 2002-04-15 | 2002-05-14 | 有機電界発光素子及び発光装置 |
JP2002-138212 | 2002-05-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003088721A1 true WO2003088721A1 (fr) | 2003-10-23 |
Family
ID=29253553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/005366 WO2003088721A1 (fr) | 2002-04-15 | 2002-05-31 | Dispositif organique a emission de champ et dispositif d'emission |
Country Status (7)
Country | Link |
---|---|
US (1) | US20050064232A1 (ja) |
EP (1) | EP1511363A4 (ja) |
JP (1) | JP2004006066A (ja) |
KR (1) | KR20040044066A (ja) |
CN (1) | CN100442568C (ja) |
TW (1) | TWI293011B (ja) |
WO (1) | WO2003088721A1 (ja) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4001118B2 (ja) * | 2003-03-24 | 2007-10-31 | ソニー株式会社 | 有機電界発光素子及びアミノモノスチリルナフタレン化合物 |
EP3623444B1 (en) * | 2003-06-02 | 2021-05-26 | UDC Ireland Limited | Organic electroluminescent devices and metal complex compounds |
KR100981015B1 (ko) * | 2004-03-25 | 2010-09-07 | 사천홍시현시기건유한공사 | 유기 전계 발광 소자의 제조 방법 |
CN100455151C (zh) * | 2005-08-30 | 2009-01-21 | 铼宝科技股份有限公司 | 有机电激发光元件及其制造方法 |
US20070215889A1 (en) * | 2006-03-20 | 2007-09-20 | Semiconductor Energy Laboratory Co., Ltd. | Aromatic amine compound, and light-emitting element, light-emitting device, and electronic appliance using the aromatic amine compound |
JP5207645B2 (ja) * | 2006-03-29 | 2013-06-12 | キヤノン株式会社 | 多色有機発光装置 |
US20100283046A1 (en) * | 2007-12-28 | 2010-11-11 | Hideki Uchida | Organic electroluminescent element |
KR101320107B1 (ko) * | 2007-12-31 | 2013-10-18 | 엘지디스플레이 주식회사 | 유기전계발광표시장치 |
US8242489B2 (en) * | 2009-12-17 | 2012-08-14 | Global Oled Technology, Llc. | OLED with high efficiency blue light-emitting layer |
US9040975B2 (en) | 2011-06-15 | 2015-05-26 | Konica Minolta, Inc. | Organic electroluminescence element, illumination device, and display device |
KR101963226B1 (ko) * | 2012-02-29 | 2019-04-01 | 삼성전자주식회사 | 트랜지스터와 그 제조방법 및 트랜지스터를 포함하는 전자소자 |
JP2018022862A (ja) * | 2016-07-20 | 2018-02-08 | 株式会社Joled | 有機電界発光素子、有機電界発光装置および電子機器 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02250292A (ja) * | 1989-03-23 | 1990-10-08 | Ricoh Co Ltd | 電界発光素子 |
JPH02291696A (ja) * | 1989-01-13 | 1990-12-03 | Ricoh Co Ltd | 電界発光素子 |
JPH08311442A (ja) * | 1995-05-17 | 1996-11-26 | Tdk Corp | 有機el素子 |
JPH10270166A (ja) * | 1997-03-27 | 1998-10-09 | Tatsuo Mori | 電界発光素子 |
EP0967834A2 (en) | 1998-06-26 | 1999-12-29 | Sony Corporation | Organic electroluminescent device |
JP2001052870A (ja) * | 1999-06-03 | 2001-02-23 | Tdk Corp | 有機el素子 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2814435B2 (ja) * | 1987-03-02 | 1998-10-22 | イーストマン・コダック・カンパニー | 改良薄膜発光帯をもつ電場発光デバイス |
US5085946A (en) * | 1989-01-13 | 1992-02-04 | Ricoh Company, Ltd. | Electroluminescence device |
DE19803889A1 (de) * | 1998-01-31 | 1999-08-05 | Bosch Gmbh Robert | Elektrolumineszierende Anordnung unter Verwendung von dotierten Blendsystemen |
JP3852517B2 (ja) * | 1998-05-18 | 2006-11-29 | ソニー株式会社 | 有機電界発光素子 |
JP2001291591A (ja) * | 2000-04-07 | 2001-10-19 | Sony Corp | 有機電界発光素子及び発光装置 |
JP4273191B2 (ja) * | 2001-03-01 | 2009-06-03 | 三星モバイルディスプレイ株式會社 | 有機発光デバイス |
-
2002
- 2002-05-14 JP JP2002138212A patent/JP2004006066A/ja active Pending
- 2002-05-23 TW TW091110879A patent/TWI293011B/zh not_active IP Right Cessation
- 2002-05-31 KR KR1020027012973A patent/KR20040044066A/ko not_active Application Discontinuation
- 2002-05-31 US US10/240,328 patent/US20050064232A1/en not_active Abandoned
- 2002-05-31 EP EP02730838A patent/EP1511363A4/en not_active Withdrawn
- 2002-05-31 WO PCT/JP2002/005366 patent/WO2003088721A1/ja active Application Filing
- 2002-09-30 CN CNB021545545A patent/CN100442568C/zh not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02291696A (ja) * | 1989-01-13 | 1990-12-03 | Ricoh Co Ltd | 電界発光素子 |
JPH02250292A (ja) * | 1989-03-23 | 1990-10-08 | Ricoh Co Ltd | 電界発光素子 |
JPH08311442A (ja) * | 1995-05-17 | 1996-11-26 | Tdk Corp | 有機el素子 |
US6203933B1 (en) | 1995-05-17 | 2001-03-20 | Tdk Corporation | Organic EL element |
JPH10270166A (ja) * | 1997-03-27 | 1998-10-09 | Tatsuo Mori | 電界発光素子 |
EP0967834A2 (en) | 1998-06-26 | 1999-12-29 | Sony Corporation | Organic electroluminescent device |
JP2000012226A (ja) * | 1998-06-26 | 2000-01-14 | Sony Corp | 有機電界発光素子 |
JP2001052870A (ja) * | 1999-06-03 | 2001-02-23 | Tdk Corp | 有機el素子 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1511363A4 |
Also Published As
Publication number | Publication date |
---|---|
EP1511363A1 (en) | 2005-03-02 |
KR20040044066A (ko) | 2004-05-27 |
JP2004006066A (ja) | 2004-01-08 |
CN100442568C (zh) | 2008-12-10 |
TWI293011B (ja) | 2008-01-21 |
EP1511363A4 (en) | 2010-08-25 |
CN1452439A (zh) | 2003-10-29 |
US20050064232A1 (en) | 2005-03-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7189466B2 (en) | Organic light-emitting element and display device | |
JP4161262B2 (ja) | 有機電界発光素子、及びそれを用いた発光又は表示装置 | |
US6010796A (en) | Electroluminescent device | |
JP3249297B2 (ja) | 有機電界発光素子 | |
US20060066231A1 (en) | Electroluminescence element | |
JP3905265B2 (ja) | 有機エレクトロルミネッセンス素子 | |
JP2001110570A (ja) | 有機電界発光素子 | |
JP2001291591A (ja) | 有機電界発光素子及び発光装置 | |
KR100751464B1 (ko) | 유기 전계 발광 소자 | |
JP2002134276A (ja) | 有機電界発光素子 | |
WO2003088721A1 (fr) | Dispositif organique a emission de champ et dispositif d'emission | |
JP3143362B2 (ja) | 有機エレクトロルミネッセンス素子 | |
JPH11329731A (ja) | 有機電界発光素子 | |
JP2000268968A (ja) | 有機エレクトロルミネッセンス素子 | |
WO2005044942A1 (ja) | 有機電界発光素子および表示装置 | |
KR100547055B1 (ko) | 유기 전계발광 소자 | |
JP3555736B2 (ja) | 有機電界発光素子 | |
KR100572654B1 (ko) | 유기 전계발광 소자 | |
KR101259532B1 (ko) | 2종의 유기층을 이용하는 백색 유기 발광 다이오드 및 이의 제조 방법 | |
KR100547056B1 (ko) | 전계발광소자 | |
KR100581639B1 (ko) | 유기 전계발광 소자 | |
JP3910010B2 (ja) | 有機電界発光素子 | |
JP2000173773A (ja) | 有機電界発光素子 | |
WO2003091357A1 (fr) | Element organique electroluminescent | |
JP2010141359A (ja) | 有機電界発光素子及び発光装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 2002730838 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020027012973 Country of ref document: KR |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CN KR SG US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 10240328 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 1020027012973 Country of ref document: KR |
|
WWP | Wipo information: published in national office |
Ref document number: 2002730838 Country of ref document: EP |