WO2006033164A1 - 有機el発光素子、その製造方法および表示装置 - Google Patents
有機el発光素子、その製造方法および表示装置 Download PDFInfo
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- WO2006033164A1 WO2006033164A1 PCT/JP2004/014418 JP2004014418W WO2006033164A1 WO 2006033164 A1 WO2006033164 A1 WO 2006033164A1 JP 2004014418 W JP2004014418 W JP 2004014418W WO 2006033164 A1 WO2006033164 A1 WO 2006033164A1
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- Prior art keywords
- organic
- layer
- light emitting
- conductive transparent
- counter electrode
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Classifications
-
- 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
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/873—Encapsulations
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/131—Interconnections, e.g. wiring lines or terminals
- H10K59/1315—Interconnections, e.g. wiring lines or terminals comprising structures specially adapted for lowering the resistance
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/17—Passive-matrix OLED displays
Definitions
- Organic EL light emitting device manufacturing method and display device
- the present invention relates to display elements, particularly light emitting elements including organic EL display elements, and more particularly to the structure and manufacturing method of these light emitting elements.
- An organic EL device has a structure in which an organic layer, which is a light emitting layer, is sandwiched between opposing electrodes, and a display device is configured by controlling light emission by the current on / off of the electrodes.
- display devices There are two types of display devices: the passive matrix method and the active matrix method. The former is used for display devices with relatively low definition! / The latter is used for display devices, and the latter is relatively high definition such as TV monitors! / ⁇ Used for display devices.
- the lifetime of the organic layer as the light emitting layer is short.
- Various studies in recent years have made the light emission time longer. For example, when it is used as a TV or monitor, the current device lifetime is still short, and when continuously lit, the brightness is halved in 2 00 to 3 00 hours. Resulting in.
- the reasons for the short lifetime of the device are the intrusion of moisture into the organic layer, which is the light-emitting layer, and the thermal destruction due to heating after the formation of the organic layer and the heat generation of the device, and various improvements have been proposed.
- Patent Document 1 JP-A-10-2 7 5 6 80 (hereinafter referred to as Patent Document 1) has a protective film having a multilayer structure including two layers of an organic layer and a metal layer or two layers of an inorganic layer and a metal layer. The configuration is disclosed.
- Patent Document 2 Japanese Patent Laid-Open No. 2 00 2-3 4 3 5 59
- Patent Document 2 has a metal heat sink placed on one electrode forming an organic EL element via an adhesive layer.
- the structure provided as a heat radiating member is disclosed.
- Patent Document 1 when two layers of an organic layer and a metal layer are used as a protective film, the thermal conductivity of the organic layer is low, which causes a problem that the heat generated in the element cannot be sufficiently diffused and released.
- Patent Document 2 the problem of heat dissipation can be avoided, but there is a space in the separation part between the light emitting elements in the passive matrix configuration, and the organic solvent and moisture generated from the adhesive remain in this part. In other words, the most important light-emitting layer could not be reliably protected due to the mixture of adhesives, resulting in a problem that the lifetime of the device was reduced.
- the method for forming the protective film is generally performed at a temperature that does not decompose the organic layer, a dense thin film cannot be formed, and in order to suppress the permeation of moisture and organic matter, from several hundred nanometers.
- a protective film with a thickness of several microns had to be formed, resulting in a problem that the thermal resistance increased and the device temperature increased, resulting in a shortened life.
- it is essential to efficiently remove moisture, organic substances, and heat generation in the light emitting layer and electrode layer. Despite this, no effective means have yet been proposed.
- the conductive transparent electrode represented by ITO has a low work function, so that the work function with the hole transport layer and the organic EL layer is not suitable. Therefore, a buffer layer is provided, but the efficiency is low. However, this led to deterioration in light emission efficiency and increase in light emission voltage, resulting in increased heat during operation and shortened life. Therefore, it is required to use an electrode suitable for the work function of the hole transport layer or organic EL layer.
- an object of the present invention is to provide a long life, organic EL element and organic EL display device, and a manufacturing method and manufacturing apparatus thereof. Disclosure of the invention
- the present invention relates to a conductive transparent electrode, a counter electrode facing the conductive transparent electrode, an organic EL light emitting layer provided between the conductive transparent electrode and the counter electrode, and the organic E
- the organic EL light emitting device having an electron transport layer and a hole transport layer provided on both sides thereof so as to be in contact with the L light emitting layer, the conductive transparent electrode, the electron transport layer, the organic EL light emitting layer, and the hole A transport layer and the counter electrode are laminated in this order to provide an organic EL light emitting device.
- a conductive transparent electrode an electron transport layer provided on the conductive transparent electrode, an organic EL light-emitting layer provided on the electron transport layer, and the organic EL light-emitting layer
- An organic EL light emitting device comprising a hole transport layer provided on the counter electrode and a counter electrode made of a conductive material having a work function of 4 eV to 6 eV provided on the hole transport layer is obtained.
- the conductive transparent electrode includes ITO
- the conductive material of the counter electrode includes at least one of Co, Ni, Rh, Pd, Ir, Pt, and Au as a simple substance or an alloy. I like it.
- ITO has a work function of about 4.8 eV and matches the work function of the electron transport layer, while Co, Ni, Rh, Pd, Ir, Pt, Au, etc. are organic EL layers. It has a work function of about 6 eV that fits the work function of.
- the conductive transparent electrode may be provided on a transparent substrate, and light emitted from the organic EL light emitting layer may be extracted via the transparent substrate, or the counter electrode may be disposed on the substrate. The light emitted from the organic EL light emitting layer may be extracted via the conductive transparent electrode.
- an organic EL light emitting device characterized in that an insulating protective layer is provided so as to cover at least the organic EL light emitting layer, and further a heat dissipation layer is provided so as to be in contact with the insulating protective layer.
- the insulating protective layer is made of at least one of a compound of nitrogen and at least one element of Ti, Zr, Hf, V, Nb, Ta, Cr, B, A1, and Si.
- the Nitrogen film is more dense than the Acid film, it has better water blocking and heat dissipation effects than the oxide film. The thinner the thickness, the higher the heat dissipation efficiency. Therefore, it is necessary to make it as thin as the function of the protective film allows. From that viewpoint, it is 100 nm or less, preferably 30 nm to 50 nm.
- the insulating protective layer may be composed of an insulating layer that covers the organic EL light emitting layer via the counter electrode and a protective layer that covers the insulating layer. This configuration is necessary in some cases.
- the present invention is also applicable to general display elements other than organic EL elements, and includes a conductive transparent electrode, a counter electrode facing the conductive transparent electrode, and the conductive transparent electrode and the counter electrode.
- a display element comprising: a light emitting layer provided on the insulating layer; and at least an insulating protective layer provided so as to directly or indirectly cover the light emitting layer.
- the insulating protective layer includes a nitrided film formed by low-temperature vapor phase growth using microphone mouth wave excitation plasma.
- the nitride film is at least one of a compound of nitrogen and an element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, B, A1, Si I prefer it. It is also a feature of the present invention that the insulating protective layer contains at least an element selected from the group consisting of A r, K r, and X e.
- a protective layer provided to cover at least the light emitting layer, wherein the protective layer is mainly made of a gas selected from the group consisting of Ar, Kr, and Xe.
- the film is formed using plasma as a component.
- the plasma is preferably a high frequency excitation plasma, particularly a microphone mouth wave excitation plasma.
- the film formation is performed by low-temperature vapor deposition, and the low-temperature vapor deposition is performed at 100 ° C. or less, preferably at room temperature.
- the low-temperature vapor phase growth is preferably performed without heating, except for heating with a plasma.
- An organic EL display device comprising: a TFT; a hole transport layer; a protective layer provided to cover at least the organic EL light-emitting layer; and a heat release layer provided so as to be in contact with the protective layer.
- the switching element is a TFT, a gate electrode connected to the gate line, a signal line electrode connected to the signal line, A pixel electrode connected to the conductive transparent electrode or the counter electrode, and the gate line and the gate electrode are embedded in an insulating film formed so as to be in contact with the substrate or the substrate. It is possible to obtain an organic EL display device characterized by being embedded.
- the protective layer includes a nitride film having a thickness of 10 Onm or less.
- a method for producing a conductive transparent film characterized in that sputtering film formation is performed with plasma containing Kr and Xe as main components.
- a method for producing a conductive transparent film including a step of sputtering an oxide film and a tint containing tin oxide with a high frequency excitation plasma to form an ITO film, wherein the sputtering comprises K
- a method for producing a conductive transparent film is obtained, which is performed using plasma containing at least one of r and Xe as a main component.
- the present invention relates to a nitride film forming method in which a nitride film is vapor-phase grown by microphone mouth wave excitation plasma, wherein the vapor-phase growth is a plasma containing at least one of Ar, Kr and Xe as a main component.
- a method of forming a nitride film characterized in that it is performed at a low temperature without heating except for heating by plasma.
- the microphone mouth-excited plasma vapor phase growth is performed by a plasma processing apparatus having a two-stage shower plate, and a gas containing at least one of Ar, Kr, and Xe is introduced into the apparatus from the upper shower plate.
- the plasma is generated, and the material gas of the nitride film is preferably introduced from the lower shower plate into the plasma, and a high frequency is applied to the deposition target member during the vapor phase growth of the nitride film. Bias on the surface of the film formation member It is also preferable to apply a potential.
- FIG. 1A is a sectional view showing the structure of a bottom emission type passive display device according to Example 1 of the present invention
- Fig. 1B is a plan view showing the structure of the bottom emission passive display element of Fig. 1A;
- FIG. 2 is a diagram showing a schematic configuration of a two-stage shower plate type microphone mouth wave excitation high-density plasma film forming apparatus used in each example;
- FIG. 3A is a sectional view showing the structure of a top emission type passive display element according to Embodiment 2 of the present invention.
- FIG. 3B is a plan view showing the structure of the top emission type passive display element of FIG. 3A;
- FIG. 4A is a sectional view showing a part of pixels of the bottom emission type passive matrix organic EL display device of Example 3 of the present invention.
- FIG. 4B is a plan view showing some pixels of the bottom emission type passive matrix organic EL display device of FIG. 4A;
- FIG. 5A is a cross-sectional view showing a part of pixels of the top emission type passive matrix organic EL display device of Example 4 of the present invention.
- FIG. 5B is a plan view showing some pixels of the top emission passive matrix organic EL display device of FIG. 5A;
- FIG. 6A is a cross-sectional view showing some pixels of a bottom emission type active matrix organic EL display device according to Embodiment 5 of the present invention.
- FIG. 6B is a plan view showing some pixels of the bottom emission type active matrix organic EL display device of FIG. 6A;
- FIG. 7A is a cross-sectional view showing a part of an organic EL device according to Example 6 of the present invention
- FIG. 7B is a plan view showing a part of the organic EL device of FIG. 7A;
- FIG. 8A is a cross-sectional view showing a part of pixels of a top emission type active matrix organic EL display device according to Embodiment 7 of the present invention
- FIG. 8B is a plan view showing some pixels of the top emission type active matrix organic EL display device of FIG. 8A;
- FIG. 9A is a cross-sectional view showing a part of an organic EL display device according to Example 8 of the present invention
- FIG. 9B is a plan view showing a part of the organic EL display device of FIG. 9A;
- FIG. 10A is a sectional view showing a part of an organic EL display device according to Example 9 of the present invention
- FIG. 10 08 is a plan view showing a part of the organic EL display device shown in FIG.
- FIG. 11A is a sectional view showing a part of an organic EL display device according to Embodiment 10 of the present invention.
- FIG. 11B is a plan view showing a part of the organic EL display device of FIG. 11A;
- FIG. 12 A is a sectional view showing a part of an organic EL display device according to Embodiment 11 of the present invention.
- FIG. 1 2 is a plan view showing a part of the organic EL display device of FIG. 1 2 A;
- FIG. 13 A is a sectional view showing a part of an organic EL display device according to Embodiment 12 of the present invention.
- FIG. 1 3 8 is a plan view showing a part of the organic EL display device of FIG. 1 3 A;
- FIG. 14A is a cross-sectional view showing a part of an organic EL display device according to Embodiment 13 of the present invention.
- FIG. 14B is a plan view showing a part of the organic EL display device of FIG. 14A; and FIG. 15 is a cross-sectional view showing an example of the heat dissipation layer according to Example 14 of the present invention. .
- a bottom emission type passive display element 10 includes a transparent substrate 1, a conductive transparent electrode 2 formed on the transparent substrate 1, and the conductive material.
- a transparent substrate 1 As an organic layer 3 laminated on the conductive transparent electrode 2, an electron transport layer 4, a light emitting layer 5, a hole transport layer 6, and a counter electrode 8 laminated on the organic layer 3 are formed so as to cover them.
- a heat dissipation layer 11 formed so as to be in contact with the protective layer 9.
- the transparent substrate 1 may be any material that transmits the light emitted from the light emitting layer 5. In Example 1, a glass substrate was used.
- the counter electrode 8 uses a Pt film, which is a high work function material, in order to increase the work function of the surface in contact with the organic layer 3 and improve the hole injection efficiency into the device. This eliminates the need for a hole injection layer or buffer layer that is generally required.
- the organic layer 3 is composed of an electron transport layer 4, a light emitting layer 5, and a hole transport layer 6.
- the organic layer 3 is not particularly limited, and the functions and effects of the present invention can be obtained by using any known material.
- the hole transport layer 6 efficiently moves holes to the light emitting layer 5 and suppresses electrons from the counter electrode 8 from moving beyond the light emitting layer 5 to the conductive transparent electrode 2 side. It has a role to increase the recombination efficiency between electrons and holes.
- the material constituting the hole transport layer 6 is not particularly limited. For example, 1, 1-bis (4-di-p-aminophenol) cyclohexane, galvazole and its derivatives, triphenylamine and its Derivatives and the like can be used.
- the light-emitting layer 5 is not particularly limited, and a quinolinol aluminum complex containing a dopant, DPVi biphenyl, or the like can be used.
- red, green, and blue light emitters may be stacked and used, and in a display device or the like, red, green, and blue light emitters may be arranged in a matrix.
- the electron transport layer 4 a silole derivative, a cyclopentagen derivative, or the like can be used.
- the material for forming the counter electrode is not particularly limited, but a low work function material that is transparent and has high electron injection efficiency is preferable, and ITO or the like having a work function of 4.5 to 4.8 eV should be used. Can do.
- T i, Z r, H f, V, N b, T a, C r, B, A l, S i are used as protective layer 9 to prevent moisture and oxidizing gas from entering the organic EL light-emitting layer.
- the protective layer 9 is made of the above-mentioned nitride, the thermal conductivity is high and the thermal resistance can be reduced.
- the protective layer 9 can also serve as the heat dissipation layer 11, but the heat dissipation is performed for more efficient heat dissipation.
- Layers 1 and 1 may be provided separately.
- a sputtering method using (preferably a sintered body of indium oxide and tin oxide) was used.
- Xe with a large collision cross section was used as the plasma excitation gas, and plasma with a sufficiently low electron temperature was generated.
- the substrate temperature was 100 ° C and the film thickness was 200 ⁇ . Since sputtering was performed using Xe plasma, the electron temperature was sufficiently low, and even if film formation was performed while irradiating Xe ions on the ITO surface during film formation in order to improve film quality, Since plasma damage is suppressed, high-quality film formation was possible even at low temperatures below 100 ° C.
- the ITO film thus formed was patterned into a predetermined shape. Patterning was performed by photolithography.
- a novolak resist as a photoresist
- exposure was performed with a mask aligner, development was performed with a predetermined developer, and surface organic matter removal cleaning was performed for 10 minutes by irradiation with ultraviolet light.
- an electron transport layer 4, a light emitting layer 5, and a hole transport layer 6 were continuously formed by an organic film deposition apparatus.
- Pt was deposited as a counter electrode 8 by a Pt sputtering apparatus adjacent to the organic film deposition apparatus.
- a material having a high work function such as Co, Ni, Rh, Pd, Ir, or Au may be used.
- sputtering was performed using Xe plasma to prevent plasma damage from entering the organic layer 3.
- the substrate was transferred to an insulating protective film forming apparatus, and the insulating layer was made into a volume by using a nitrogen nitride film.
- the process pressure is preferably 0.1 to 1 Torr, and in this example, 0.5 Torr.
- a high frequency of 13.56 MHz was applied from the backside of the substrate, a potential of about 15 V was generated as a bias potential on the substrate surface, and ions in the plasma were irradiated.
- the substrate temperature at the time of forming the nitrogen nitride film was room temperature, and heating by the heating means was not performed other than inevitably heating by the plasma.
- a film thickness of 50 nm was formed.
- the two-stage shower plate type microphone mouth wave excitation high-density plasma film-forming device 20 used for film formation has a high-frequency ion irradiation bias in the chamber.
- a substrate to be processed 14 is placed on a support portion 12 having a power source 13.
- a lower shower plate 23 that constitutes a process region (diffusion plasma region) for supplying a source gas such as H 2 , N 2 , Si H 4, etc., facing the processing surface of the substrate 14, and further a predetermined interval
- the upper shower plate 2 2 that constitutes the plasma excitation region that supplies the plasma excitation gas (A r) 1 8 and the dielectric window 19 and the microwave are indicated by arrows 24 on the upper shower plate 2 2.
- a microwave radiation antenna 21 to be introduced.
- the two-stage shower plate type microwave-excited high-density plasma deposition system 20 uses microwave-excited plasma, and because the process region can be located away from the plasma excitation region, the electron temperature in the process region is A Even if r is used, it is 1.0 eV or less, and the plasma density is 1 O 1 1 / cm 2 or more. Since it has a two-stage shower plate structure, a source gas such as silane can be introduced into the process area away from the plasma excitation area, so that excessive dissociation of silane can be suppressed, and light-emitting elements and films can be formed even at room temperature. A dense film could be formed without causing defects in the protective film.
- the nitride film can be densely formed, and the film quality is further improved. I was able to. Although the substrate is heated by the plasma as described above, it is also important not to perform any other heating. Vapor phase growth may be performed while cooling the substrate in order to suppress heating by the plasma. Thereafter, further aluminum was deposited to a thickness of 1 micron with an aluminum vapor deposition device to form a heat dissipation layer 11.
- Example 1 It is also possible to perform aluminum sputter film formation instead of aluminum vapor deposition. In that case, sputter deposition using Xe plasma with a low electron temperature is effective.
- the light emitting device of Example 1 was obtained.
- the luminance half-life which was 20:00 hours in the past, was 60:00 hours, and the effect of the protective layer 9 was confirmed.
- the top emission type passive display element 25 of Example 2 is formed on the substrate 26 and the conductive transparent electrode 2 formed on the substrate 26.
- the protective layer 27 is formed so as to cover them, and the transparent heat radiation layer 28 is formed so as to be in contact with the protective layer 27.
- the substrate material is not particularly limited, but from the viewpoint of heat dissipation, metals, silicon nitride, nitrided aluminum, boron nitride, etc. are preferred.
- the substrate 26 When a metal substrate is used, the substrate 26 may be used also as the counter electrode 8. Pt was used as the counter electrode 8 also serving as a metal substrate.
- a hole transport layer 6, a light emitting layer 5, and an electron transport layer 4 were laminated in the same manner as described in Example 1.
- known materials can be used, but the materials shown in Example 1 are exemplified.
- the light emitting layer 5 may be a single layer or a stack of red, green and blue light emitters, depending on the application.
- an ITO film was formed by the method shown in Example 1 to obtain a conductive transparent electrode 2.
- the ITO film is sputtered by Xe plasma, which has a low electron temperature, no damage caused by the plasma is observed on the underlying organic layer 3 or the deposited ITO film. Film formation was possible.
- Nitrogen oxide was deposited by the method shown in Example 1 so as to cover the top emission type organic EL element obtained in this way, and an insulating protective film 2 7 also serving as a heat dissipation layer 28. did. The thickness of this insulating protective film 27 was 50 nm.
- Nitrogen silicate has a high thermal conductivity of 80 W / (m ⁇ K), and because a dense thin film can be formed by microwave-excited plasma, the thermal resistance can be sufficiently reduced.
- the protective layer 2 7 functions sufficiently as the heat dissipation layer 28. Sufficient heat dissipation can be obtained by using a metal as the substrate and nitrogen nitride as the insulating protective layer 28. However, a separate heat dissipation layer may be used for efficient heat dissipation.
- the transparent heat radiation layer 28 used for the top emission type is not particularly limited as long as it is a transparent material having high thermal conductivity, but ITO is exemplified. When the luminance half-life of the organic EL element thus completed was measured, it was 9 00 hours, which was 30 00 hours in the past, confirming the effect of the protective layer.
- Figures 4A and 4B show bottom emission passive matrix organic EL display device 3 2 formed on transparent substrate 1, conductive transparent electrode 2, and conductive transparent electrode 2.
- the organic layer 3 is formed so as to directly or indirectly cover the electron transport layer 6, the light emitting layer 5, the hole transport layer 4, the counter electrode 8 formed on the organic layer 3, and the light emitting layer 5.
- a protective layer 9 and a heat dissipation layer 1 1 are provided. Since the bottom emission type organic EL display element shown in Example 1 is arranged in a matrix, the element selected by the conductive transparent electrode 2 and the counter electrode 8 emits light.
- the conductive transparent electrode 2 and the counter electrode 8 are patterned in a matrix, and a plurality of elements are arranged.
- Reference numeral 31 denotes a light emitting unit.
- the protective film 9 constituting the protective layer 9 is preferably silicon nitride, nitrous aluminum, boron nitride, etc. from the viewpoint of insulation between different counter electrodes.
- the method described in Example 1 is used.
- the nitride nitride formed in (1) was used. Since the elements shown in Example 1 are arranged on a matrix, the same effect as that of Example 1 can be obtained while simply configuring a display device, and the luminance half-life of the element is improved by the dense and thin protective layer 9. As a result of the measurement, the luminance half-life, which was 20:00 hours in the past, was 60:00 hours.
- the top emission type passive matrix organic EL display device 32 of Example 4 includes a substrate 26, a counter electrode 8 facing the conductive transparent electrode 2, and As the organic layer 3 formed on the counter electrode 8, the hole transport layer 6, the light emitting layer 5, the electron transport layer 4, the conductive transparent electrode 2 formed on the organic layer 3, and the light emitting layer 5 are directly or Consisting of a protective layer 9 formed so as to cover indirectly and a heat dissipation layer 1 1, the top emission type organic EL display element shown in Example 2 is arranged in a matrix, so that a conductive transparent electrode The element selected by 2 and the counter electrode 8 emits light.
- the substrate 26 is insulative, and is made of glass, quartz substrate, nitride nitride substrate, nitride layer. Aluminum substrates, boron nitride substrates, and the like are preferable. From the viewpoint of heat dissipation, a high thermal conductivity, a silicon nitride substrate, an aluminum nitride substrate, a silicon nitride substrate, and the like are more preferable. The nitride nitride formed by the above method was used.
- the conductive transparent electrode 2 and the counter electrode 8 are patterned in a matrix shape, and a plurality of elements are arranged.
- the same effect as in Example 2 was obtained, and it was dense and thin! /
- the luminance half life of the element is improved.
- the luminance half-life was 9000 hours, which was 3000 hours in the past.
- the bottom emission type active matrix organic EL display device 33 includes a substrate 1, a plurality of gate lines, and a plurality of signals crossing the gate lines. 41, a switching element installed near the intersection of the gate wiring and the signal! 41, a conductive transparent pixel electrode 37 connected to the switching element, and an organic layer formed on the transparent pixel electrode 37.
- Layer 3 includes an electron transport layer 4, a light emitting layer 5, a hole transport layer 6, a counter electrode 8 formed on the organic film 3 so as to face the transparent pixel electrode 37, and at least the organic layer 3 directly or directly.
- the protective layer 9 is formed so as to cover the protective layer 9 and the heat dissipation layer 11 is formed so as to be in contact with the protective layer 9.
- an electron transport layer 4, a light emitting layer 5, and a hole transport layer 6 are formed from the side close to the transparent pixel electrode 37.
- Switching elements such as TFT elements and MIM elements, that can control current ON / OFF are often preferred, and TFT elements are preferred because of the controllability of the brightness of organic EL elements.
- the TFT element varies depending on the specifications of the display device, a known amorphous TFT or polysilicon TFT can be suitably used.
- A1 was sputtered onto a cleaned glass substrate by 300 nm.
- Ar, Kr, and Xe gases can be suitably used.
- Xe the electron collision cross-section is large and the electron temperature is low, so that damage to the deposited A 1 is suppressed by plasma. Is preferred.
- the deposited A 1 was patterned by the photolithographic method to form gate wiring and gate electrode 35.
- the substrate temperature was 200 ° C.
- a r: N 2 : H 2 : Si H 4 80: 18: 1.5:
- a gate nitride film 34 was formed by depositing 300 nm of nitride nitride.
- n + amorphous silicon was deposited by patterning the laminated film of amorphous silicon and n + silicon by photolithography.
- an ITO film having a thickness of 350 nm was formed by the same method as shown in Example 1, and patterned by photolithography, so that the signal line 41 and the signal line electrode were formed. 3 8 and conductive transparent pixel electrode 3 7.
- the n + amorphous silicon layer was etched by a known ion etching method to form the TFT channel part isolation region did.
- the FT channel separation part A protective film and an insulating layer that prevents short-circuiting between the conductive transparent electrode 37 and the counter electrode 8 of the organic EL element were used.
- the organic layer 3 the electron transport layer 4, the light emitting layer 5, and the hole transport layer 6 were continuously formed and used for gate wiring formation without being exposed to the atmosphere.
- Pt was deposited using Xe plasma with a low electron temperature, and the counter electrode 8 was formed.
- a nitride film of 50 nm was deposited at room temperature to form the protective layer 9.
- This protective layer 9 has a high thermal conductivity of 80 WZ (m-K) and is sufficiently thin, so its thermal resistance is low, and it can also serve as a heat dissipation layer alone, but it can dissipate heat more efficiently.
- a heat dissipation layer 11 may be provided separately.
- the A 1 sputtering apparatus used for forming the gate wiring was used to form the A 1 film by using the Xe plasma having a low electron temperature to form the heat radiation layer 11.
- the bottom-emission active matrix organic EL display device obtained in this way eliminates the need for a buffer layer or a hole injection layer due to the high work function of P t, and thus can emit light with high efficiency. Moreover, since the thin protective layer 9 having high thermal conductivity is used, the temperature rise of the element can be suppressed while sufficiently fulfilling the function of the protective layer 9, so that the element life can be remarkably improved.
- the luminance of the display device shown in this example is halved. As a result of measuring the service life, what was previously 200 hours was improved to 60 hours.
- Example 6 of the present invention has a configuration in which a transparent planarizing film 42 is formed on a TFT, and thereafter an organic EL element is formed.
- the organic EL element can be formed on a flat surface, which improves the manufacturing yield.
- the organic EL layer is formed in a layer different from the signal line layer, the pixel electrode 37 can be extended and arranged on the signal wiring, and the area of the light emitting element can be increased.
- the signal line can be formed of a material different from that of the pixel electrode, there is no need to use a conductive transparent material, wiring resistance when the display device is enlarged can be reduced, and display gradation can be increased. .
- the bottom emission type active matrix organic EL display device of Example 6 is formed as follows. First, gate lines, TFT elements, and signal lines are formed by the method described in Example 5. The signal line was obtained by forming a film of 30 nm of A 1 by sputtering using Xe gas shown in Example 6 and patterning by photolithography. Next, a photosensitive transparent resin was applied by a spin coating method, exposed and developed, and then dried at 150 ° C. for 30 minutes to obtain a flattened film. Through the exposure and development processes, the planarizing film 42 is provided with a connection hole for connecting the pixel side electrode of the TFT and the organic EL element.
- photosensitive transparent resins examples include acrylic resin, polyolefin resin, and alicyclic olefin resin, but alicyclic olefin resins are preferred because they contain little moisture and release and have excellent transparency. In the examples, alicyclic olefin resins were used.
- an ITO film was formed by the method described in Example 1, and patterned by photolithography to obtain a conductive transparent pixel electrode 37. Bow I Continuing, the electron transport layer 4, the light-emitting layer 5, and the hole transport layer 6 were successively formed by the method shown in Example 1, and P t by the sputtering method using the X e plasma shown in Example 1 as well. The counter electrode 8 was formed.
- the light emitting layer may be used by arbitrarily laminating materials that emit red, green, and blue light, and each layer may be formed as a single layer and placed on a matrix.
- a silicon nitride film was deposited at 50 nm to form a protective film 9.
- the Nitrogen Key film has a high thermal conductivity and is sufficiently thin to form a protective layer 9 that also serves as the heat dissipation layer 11 even in this state.
- a 1 was deposited by the sputtering method using Xe plasma shown in Example 1 to form a heat dissipation layer 11.
- the lifetime which was 20 00 hours is 60 00 hours, and the light emitting area is 60% of the conventional device area ratio.
- the surface brightness increased by 20%. Since the organic layer 3 is formed on the flattening film 42, there is no film formation failure and the manufacturing yield is improved.
- FIGS. 8A and 8B show the top emission type active matrix organic EL display device 40 of Example 7, which includes a substrate 26, a plurality of gate lines, a plurality of signal lines crossing the gate lines, As the switching element installed near the intersection of this gate line and this signal line, the counter pixel electrode 44 connected to the switching element, and the organic layer 3 formed on the counter pixel electrode 44,
- the hole transport layer 6, the light emitting layer 5, the electron transport layer, the conductive transparent electrode 21 formed on the organic film so as to face the counter pixel electrode 44, and at least the organic layer 3 are directly or indirectly connected.
- the protective layer 9 is formed so as to cover the protective layer 9 and the heat radiation layer 11 is formed so as to be in contact with the protective layer 9.
- a hole transport layer 6, a light emitting layer 5, and an electron transport layer (electron injection layer) 4 5 are formed from the side close to the transparent pixel electrode 4 4.
- Switching elements such as TFT elements and MIM elements, that can control the current ONZOF F are preferred, and TFT elements are preferred because of the controllability of the brightness of organic EL elements.
- the TFT element depends on the specifications of the display device, a known amorphous TFT or polysilicon TFT can be suitably used.
- a 1 was sputtered on a cleaned glass substrate by 300 nm.
- Ar, Kr, and Xe gases can be suitably used.
- Xe the electron collision cross section is large and the electron temperature is low, so that the deposited A1 is damaged by plasma. Is more preferable.
- the deposited A 1 is patterned by the photolithographic method, and the gate wiring and gout electrode 3 It was set to 5.
- a nitride film of 30 nm was formed as a gate insulating film.
- the device region was formed by patterning the deposited amorphous silicon and n + silicon film by photolithography. Next, a photoresist was applied, exposed, and developed to form a resist mask in a region other than the signal line, signal line electrode 38, and counter electrode 8 part.
- Example 2 Subsequently, by using the same method as shown in Example 1, using Xe plasma, without damaging the device, 1: was completed, and patterning was performed using the lift-off method. A line electrode 38 and a counter electrode 44 were obtained. Next, using the patterned Pt film as a mask, the n + amorphous silicon layer was etched by a known ion etching method to form a TFT channel region. Using the two-stage shower plate microwave plasma deposition system used in Example 1, a nitride film was deposited at room temperature, and the organic EL element region was patterned by photolithography, so that the protective film for the TFT channel separation portion and The insulating layer prevents the short circuit between the conductive transparent electrode and the counter electrode of the organic EL element.
- Example 2 by the method described in Example 1, as the organic layer 3, a hole transport layer 6, a light emitting layer 5, and an electron transport layer (electron injection layer) 45 are continuously formed and carried out without being exposed to the atmosphere.
- an ITO film having a thickness of 150 nm was formed as a conductive transparent electrode 2.
- 5 nm of nitrogen was formed at room temperature to form the protective layer 9.
- This protective layer 9 has a high thermal conductivity of 80 WZ (m-K) and is sufficiently thin, so its thermal resistance is low, and it can also serve as the heat dissipation layer 11 alone, but dissipates heat more efficiently.
- a heat dissipation layer may be provided separately.
- the transparent heat dissipation layer 11 used in the top emission type is not particularly limited as long as it has a high thermal conductivity and is transparent.
- PT / JP2004 / 014418 is exemplified by ITO.
- the top emission type active matrix organic EL display device obtained in this way can emit light with high efficiency because the buffer layer and the hole injection layer are not required due to the high work function of the Pt film. . Furthermore, since the thermal conductivity is high and a thin protective layer is used, the temperature rise of the element can be suppressed while sufficiently fulfilling the function of the protective layer, so that the element life can be significantly improved. As a result of measuring the luminance half-life of the display device shown in this example, it was improved from 30:00 hours to 9100 hours.
- Example 8 shown in FIGS. 9A and 9B has a configuration in which a planarizing film 42 is formed on TFT, and then an organic EL element is formed. By doing so, the organic EL element can be formed on the flat surface, and the manufacturing yield is improved. Further, since the organic EL layer is formed in a layer different from the signal line layer, the counter pixel electrode 44 can be extended and arranged on the signal line, and the area of the light emitting element can be increased. Furthermore, since the signal line can be formed of a material different from that of the counter pixel electrode 44, there is no need to use a conductive transparent material, wiring resistance when the display device is enlarged can be reduced, and display gradation is increased. be able to.
- the top emission type active matrix organic EL display device of Example 8 is formed as follows.
- gate lines, TFT elements, and signal lines are formed by the method described in Example 7.
- the signal line was obtained by depositing A 1 at a thickness of 300 nm by sputtering using Xe gas shown in Example 6 and patterning by photolithography.
- a photosensitive transparent resin was applied by spin coating, exposed and developed, and then dried at 150 ° C. for 30 minutes to obtain a flattened film.
- the planarizing film is provided with a connection hole for connecting the pixel side electrode of the TFT and the organic EL element.
- the photosensitive transparent resin examples include acrylic resin, polyolefin resin, alicyclic olefin resin, etc., but alicyclic olefin resin is preferable because it contains little moisture and is released and has excellent transparency. Used alicyclic olefin resin.
- a Pt film was formed by sputtering using Xe plasma and patterned by the lift-off method to obtain a counter electrode.
- a hole transport layer 6, a light emitting layer 5, an electron transport layer (electron injection layer) 4 5 were continuously formed by the method shown in Example 1, and an ITO film was formed by the same method as in Example 1.
- a conductive transparent pixel electrode 2 was obtained.
- the light emitting layer 5 may be formed by arbitrarily laminating materials emitting red, green, and blue, and each may be formed as a single layer and arranged on a matrix.
- 50 nm of nitrided nitride film was deposited to form a protective film. Since the silicon nitride film has a high thermal conductivity and is sufficiently thin, it becomes the protective layer 9 that also serves as the heat dissipation layer 11 even in this state, but in order to further efficiently dissipate the heat dissipation layer 1 1 May be provided separately.
- the transparent heat radiation layer 11 used for the top emission type is not particularly limited as long as it has a high thermal conductivity and is transparent, and examples thereof include ITO.
- the lifetime which was 30 00 hours is 9 00 hours, and the light emitting area is 60% of the conventional device area ratio.
- the surface brightness increased by 20%. Since the organic layer 3 is formed on the flattening film 42, there is no film formation failure and the manufacturing yield is improved.
- the bottom emission type active matrix organic EL display device 46 of Example 9 includes a substrate 1, a plurality of gate lines, and a plurality of gate lines crossing the gate lines.
- the layer 3 was formed on the organic film of the organic layer 3 so as to face the electron transport layer (electron injection layer) 4 5, the light emitting layer 5, the hole transport layer 6, and the transparent pixel electrode 3 7.
- a counter electrode, a protective layer 9 formed so as to cover at least the organic layer 3 directly or indirectly, and a heat dissipation layer 11 formed so as to be in contact with the protective layer 9 are included.
- an electron transport layer 4, a light emitting layer 5, and a hole transport layer 6 are formed from the side close to the transparent pixel electrode 37.
- Switching elements such as TFT elements and MIM elements, that can control the current ONZOFF are often used, and TFT elements are preferred from the standpoint of brightness controllability of organic EL elements. 8
- the TFT element depends on the specifications of the display device, a known amorphous TFT or polysilicon TFT can be suitably used.
- Example 9 a method for manufacturing the active matrix organic EL display device of Example 9 will be described.
- a high temperature of 13.56 MHz was applied from the substrate to the cleaned glass substrate using the two-stage shower plate microwave-excited plasma film forming apparatus used in Example 1, and the substrate temperature was 200 ° while performing ion irradiation.
- the gate insulating film 34 was formed.
- the substrate temperature is 200.
- C By using C, it was possible to form a high-quality nitrogen nitride that can be used as the gate insulating film 34 and has a high withstand voltage and a low interface state density.
- a 1 was deposited by sputtering at 300 nm. Ar, Kr, and Xe gases can be suitably used for sputtering. However, when Xe is used, the electron collision cross section is large and the electron temperature is low, so that damage to the deposited A1 due to plasma is suppressed. More preferred.
- the deposited A 1 was patterned by photolithography to form gate wiring and gate electrodes.
- a contact hole is formed on the formed nitride by photolithography, and an ITO film having a thickness of 350 nm is formed by a method similar to the method shown in Example 1.
- the signal line is then patterned by photolithography. As a result, a signal line electrode 38 and a conductive transparent pixel electrode 37 were obtained.
- nitride nitride was formed at room temperature to form the protective layer 9.
- This protective layer 9 has a high thermal conductivity of 8 OW / (mK), and is sufficiently thin so that its thermal resistance is low,
- a single layer can also serve as a heat dissipation layer, but in order to dissipate heat more efficiently, a heat dissipation layer 11 can be provided (additional J can be provided.
- a 1 sputter used for gate wiring formation A 1 was formed into a heat release layer 11 using Xe plasma with a low electron temperature.
- the bottom emission type active matrix organic EL display device 46 obtained in this way can emit light with high efficiency because the high work function of P t eliminates the need for a buffer layer or hole injection layer. .
- the current drive capability has been improved, the organic EL element has good controllability, and high-quality display has become possible.
- the thin protective layer 9 having high thermal conductivity is used, the temperature rise of the element can be suppressed while sufficiently fulfilling the function of the protective layer 9, so that the element life can be remarkably improved. As a result of measuring the luminance half-life of the display device shown in this example, it was improved from 20:00 hours to 60:00 hours.
- Example 10 shown in FIGS. 11A and 11B includes a structure in which a planarizing film 42 is formed on TFT, and then an organic EL element is formed.
- the organic EL element can be formed on a flat surface, and the manufacturing yield is improved.
- the organic EL layer is formed in a layer different from the signal line layer, the pixel electrode 37 can be extended and arranged on the signal wiring, and the area of the light emitting element can be increased.
- the signal line can be formed of a material different from that of the pixel electrode, there is no need to use a conductive transparent material, and the wiring resistance when the display device is enlarged can be reduced, and the display gradation is increased. be able to.
- the bottom emission type active matrix organic EL display device 50 of Example 10 is formed as follows. First, a TFT element, a gate line, and a signal line are formed by the method described in Example 9. The signal line was obtained by patterning A 1 with a thickness of 300 nm by the sputtering method using the Xe gas shown in Example 6 and by photolithography. Next, a photosensitive transparent resin was applied by spin coating, and after exposure and development, drying at 150 ° C. for 30 minutes was performed to obtain a flattened film. Through the exposure and development processes, the planarizing film is provided with a connection hole for connecting the pixel side electrode of the TFT and the organic EL element.
- Photosensitive transparent resins include acrylic resin and poly There are olefin resins, alicyclic olefin resins, and the like, but alicyclic olefin resins with low moisture content and release and excellent transparency are preferred. In this example, alicyclic olefin resins were used.
- an ITO film was formed by the method described in Example 1, and patterned by a photolithography method to obtain a conductive transparent pixel electrode 37. Subsequently, the electron transport layer 4, the light-emitting layer 5, and the hole transport layer 6 were continuously formed by the method shown in Example 1, and Pt was formed by the sputtering method using the Xe plasma shown in Example 1 as well. The counter electrode 8 was obtained.
- the light emitting layer 5 may be formed by arbitrarily laminating materials emitting red, green, and blue, and each may be formed as a single layer and arranged on a matrix.
- a nitride nitride film was deposited at 50 nm to form a protective film. Since the silicon nitride film has a high thermal conductivity and is sufficiently thin, it becomes a protective layer 9 that also serves as a heat dissipation layer in this state. However, in order to dissipate heat more efficiently, the X e shown in Example 1 is used. A 1 was deposited by sputtering using plasma to form the heat dissipation layer 11.
- the lifetime which was 20 00 hours is 60 00 hours, and the light emitting area is 60% of the conventional device area ratio.
- the surface brightness increased by 20%. Since the organic layer 3 is formed on the flattening film 42, there is no film formation failure and the manufacturing yield is improved. Furthermore, because polysilicon is used as the TFT element, the current drive capability has been improved, the organic EL element has good controllability, and high-quality display has become possible.
- Example 9 the formation order of the counter electrode 8 and the conductive transparent electrode 3 7, the hole transport layer and the electron transport layer was changed in the same manner as in Example 7. By replacing it, a top emission type active matrix display device can be obtained.
- the formed top emission type active matrix display device 51 may have an insulating surface as long as substrate 26 is not limited.
- a metal substrate on which a nitride nitride film was formed was used.
- Polysilicon TFT shown in Example 10 was used as the TFT element.
- the bottom emission type active matrix organic EL obtained in this way
- the display device 51 can emit light with high efficiency because the buffer layer and the hole injection layer are unnecessary because of the higher Pt film and work function.
- polysilicon is used as the TFT element, the current drive capability has been improved, the organic EL element has good controllability, and high-quality display has become possible.
- the thin thermal protection layer 9 having high thermal conductivity is used, the temperature rise of the element can be suppressed while sufficiently fulfilling the function of the protective layer 9, and the element life can be remarkably improved. As a result of measuring the luminance half-life of the display device shown in this example, it was improved from 30 hours to 9 00 hours.
- the counter electrode, the conductive transparent electrode, the hole transport layer, and the electron transport layer were formed in the same manner as the method shown in Example 8 in comparison with the potent emission type active matrix display device shown in Example 10. By changing the order, a top emission type active matrix display device can be obtained.
- the top-emission type active matrix display element formed as described above is not limited as long as the substrate 2.6 has an insulating surface.
- a metal substrate on which a nitride nitride film was formed was used.
- the TFT element the polysilicon TFT shown in Example 11 was used.
- the bottom emission type active matrix organic EL display device thus obtained can emit light with high efficiency because the buffer layer and the hole injection layer are not required due to the high work function of the Pt film. .
- polysilicon is used as the TFT element, the current drive capability has been improved, the organic EL element has good controllability, and high-quality display has become possible.
- the thin protective layer 9 having high thermal conductivity is used, the temperature rise of the element can be suppressed while sufficiently fulfilling the function of the protective layer 9, so that the element life can be remarkably improved. As a result of measuring the luminance half-life of the display device shown in this example, it was improved from 30 hours to 9 00 hours.
- the light emitting area was 80% compared to the conventional element area ratio of 60%, and the surface brightness increased by 20%.
- the organic layer 3 is formed on the flat film 42, there is no occurrence of film formation failure and the manufacturing yield is improved.
- the bottom emission type organic EL display device 53 in Example 13 was installed in the vicinity of the transparent substrate 1, a plurality of gate lines, a plurality of signal lines intersecting the gate lines, and the intersections of the gate lines and the signal lines.
- a switching element a conductive transparent pixel electrode 37 connected to the switching element, an organic layer 3 formed on the transparent pixel electrode 37, an electron transport layer 4, a light-emitting layer 5, a hole transport layer 6,
- a counter electrode 8 formed on the organic film constituting the organic layer 3 so as to face the transparent pixel electrode 37; a protective layer 9 formed so as to directly or indirectly cover at least the organic layer 3;
- the heat dissipation layer 11 is formed so as to be in contact with the layer 9.
- an electron transport layer 4, a light emitting layer 5, and a hole transport layer 6 are formed from the side close to the transparent pixel electrode 37.
- the TFT element and the display device of this embodiment are formed as follows. First, 35 ⁇ of photosensitive transparent resin is applied on the cleaned substrate, exposed, and developed to form openings in the gate line and the gate electrode region. Next, a metal film is formed in the opening with the same thickness as that of the photosensitive transparent resin by a screen printing method, an ink jet printing method, a plating method, or the like, and the gate wiring and the gate electrode 35 are obtained.
- the material of the metal film can be appropriately selected depending on the production method, but Au, Cu, Ag, A1, etc. having low resistivity are preferable. In this example, Ag was selected as the wiring material.
- the substrate temperature was 200 ° C.
- Ar: N 2 : H 2 : Si H 4 80: 18: 1.5: 0 In 5
- a 300 nm nitride nitride film was formed as a gate insulating film 34.
- the n + amorphous silicon layer was etched by a known ion etching method to form a TFT channel region isolation region.
- Protective film for TFT channel separation by depositing silicon nitride at room temperature using the two-stage shower plate microwave plasma deposition system used in Example 1 and patterning the organic EL element region by photolithography 9 and the organic EL element were used as an insulating layer to prevent a short circuit between the conductive transparent electrode and the counter electrode.
- the organic layer 3 the electron transport layer 4, the light emitting layer 5, and the hole transport layer 6 were continuously formed and used for forming the gate wiring without being exposed to the atmosphere.
- the protective layer 9 has a high thermal conductivity of 8 OW / (m-K), and is sufficiently thin to have a low thermal resistance. Even if it alone can serve as a heat dissipation layer, it can dissipate heat more efficiently.
- a heat dissipation layer 11 may be provided separately.
- the A 1 sputtering apparatus used for forming the gate wiring is used to form A 1 using Xe plasma having a low electron temperature and to be used as the heat dissipation layer 11.
- the bottom emission type active matrix organic EL display device obtained in this way does not require a buffer layer or a hole injection layer due to the high work function of the Pt film, so it can emit light with high efficiency. .
- the thin protective layer 9 having high thermal conductivity is used, the temperature rise of the element can be suppressed while sufficiently fulfilling the function of the protective layer 9, so that the element lifetime can be significantly improved.
- the luminance half-life of the display device shown in this example it was improved from 20:00 hours to 60:00 hours.
- the gate electrode is embedded, the semiconductor layer composing the TFT can be formed on a smooth surface, and the current variation of the TFT can be suppressed, so that not only the display quality is improved, but also due to the current variation. The lifetime variation of the organic EL element can be suppressed.
- a polysilicon layer may be used in place of the amorphous silicon layer.
- the current drive capability of the TFT is improved, so that the light emission controllability of the organic EL element is improved. Display quality can be improved.
- a top emission type configuration may be obtained by replacing the counter electrode and the conductive transparent electrode, and the hole transport layer and the electron transport layer, respectively. It is possible to improve the light extraction efficiency from the organic EL device.
- a planarization film may be formed on the TFT and an organic EL element may be formed on the planarization film. Since the EL layer is formed on a flat surface, film formation defects and the like are suppressed, so that the device life is improved, and it is possible to suppress variations in luminance and variations in life.
- the heat dissipation layer according to Example 14 shows an example of the heat dissipation layer of the display element in Example 1.
- the heat dissipation layer 11 of Example 14 has a comb-shaped pattern on the surface, thereby improving the area in contact with the external layer, for example, the air layer, and improving the heat dissipation efficiency. is there.
- the comb-shaped electrode thus improved the heat dissipation efficiency and improved the luminance half-life of the device by 20%.
- a comb-shaped structure is used.
- any structure that can increase the contact area with an external layer may be used.
- the heat radiation layer 11 does not need to cover the entire surface of the element when it is not used as the protective layer 9, and at least covers the light emitting region. Adjacent heat dissipation layers 11 may be connected and another heat dissipation means such as a heat sink or a Peltier element may be provided outside the element.
- top emission type it is possible to provide unevenness of several nanometers to several tens of nanometers, which is sufficiently shorter than the wavelength of light, and it may be several microns high to match the shape of the black matrix.
- a matrix-like lattice shape may be provided, thereby reducing the number of heat release effects. Can improve by about 0 .
- Pt is used as the counter electrode.
- a high work function material such as Co, Ni, Rh, Pd, Ir, or Au may be used.
- One can be used alone or as an alloy.
- a high work function material such as Co, Ni, Rh, Pd, Ir, Pt, and Au is used as the anode-side counter electrode facing the transparent electrode. Therefore, the hole injection efficiency in the organic EL element is improved, and the generally required Honore injection layer and buffer layer are not required. Therefore, the light emission efficiency is improved, and the luminance can be improved. Furthermore, since the energy barrier to the light emitting layer is reduced, the amount of heat generation is reduced, and the lifetime of the organic EL element can be improved.
- a nitride is used as a protective layer of the organic EL light emitting layer, a stable protective layer having high thermal conductivity and no permeation of moisture or oxidizing gas even with a thin film can be obtained.
- the heat generated in the light-emitting layer can be efficiently released to the outside, the lifetime of the organic EL element can be improved.
- the nitride protective film is formed by low temperature vapor phase growth, damage to the organic EL layer can be prevented.
- an organic EL element can be formed on a flat structure, film formation defects and the like can be reduced, and the lifetime of the element can be improved.
- the organic EL electrode and the signal line can be arranged in separate wiring layers, so that the display area can be increased and the screen brightness can be improved. Furthermore, according to the display element of the present invention, since the electrode of the organic EL and the signal line can be arranged in different wiring layers, the signal line and the electrode of the organic EL element can be made of different materials. Resistance can be reduced and a large display device can be formed. Furthermore, according to the display device of the present invention, since a TFT with a buried gate structure can be used, the semiconductor region of the TFT element can be made substantially flat, and the current variation of the TFT element can be reduced. While realizing a high-quality display, it is possible to reduce the lifetime variation of organic EL elements. Industrial applicability
- the organic EL light emitting device according to the present invention is most suitable for a display device such as a television, a monitor, and a display.
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JPH06163158A (ja) * | 1992-11-19 | 1994-06-10 | Pioneer Electron Corp | 有機エレクトロルミネッセンス素子 |
JPH08185982A (ja) * | 1994-12-28 | 1996-07-16 | Sanyo Electric Co Ltd | 有機エレクトロルミネッセンス素子 |
JPH10261487A (ja) * | 1997-03-18 | 1998-09-29 | Sanyo Electric Co Ltd | 有機エレクトロルミネッセンス素子及びその製造方法 |
JPH10294182A (ja) * | 1997-04-18 | 1998-11-04 | Idemitsu Kosan Co Ltd | 有機エレクトロルミネッセンス素子 |
JP2002299241A (ja) * | 2001-03-28 | 2002-10-11 | Tadahiro Omi | マイクロ波プラズマプロセス装置、プラズマ着火方法、プラズマ形成方法及びプラズマプロセス方法 |
JP2003142255A (ja) * | 2001-11-02 | 2003-05-16 | Seiko Epson Corp | 電気光学装置及びその製造方法並びに電子機器 |
JP2004127627A (ja) * | 2002-09-30 | 2004-04-22 | Semiconductor Energy Lab Co Ltd | 表示装置 |
JP2004127551A (ja) * | 2002-09-30 | 2004-04-22 | Seiko Epson Corp | 有機el装置とその製造方法、および電子機器 |
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2004
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JPH06163158A (ja) * | 1992-11-19 | 1994-06-10 | Pioneer Electron Corp | 有機エレクトロルミネッセンス素子 |
JPH08185982A (ja) * | 1994-12-28 | 1996-07-16 | Sanyo Electric Co Ltd | 有機エレクトロルミネッセンス素子 |
JPH10261487A (ja) * | 1997-03-18 | 1998-09-29 | Sanyo Electric Co Ltd | 有機エレクトロルミネッセンス素子及びその製造方法 |
JPH10294182A (ja) * | 1997-04-18 | 1998-11-04 | Idemitsu Kosan Co Ltd | 有機エレクトロルミネッセンス素子 |
JP2002299241A (ja) * | 2001-03-28 | 2002-10-11 | Tadahiro Omi | マイクロ波プラズマプロセス装置、プラズマ着火方法、プラズマ形成方法及びプラズマプロセス方法 |
JP2003142255A (ja) * | 2001-11-02 | 2003-05-16 | Seiko Epson Corp | 電気光学装置及びその製造方法並びに電子機器 |
JP2004127627A (ja) * | 2002-09-30 | 2004-04-22 | Semiconductor Energy Lab Co Ltd | 表示装置 |
JP2004127551A (ja) * | 2002-09-30 | 2004-04-22 | Seiko Epson Corp | 有機el装置とその製造方法、および電子機器 |
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