TWI458383B - Scavenger for top emission type organic el device and top emission type organic el device - Google Patents
Scavenger for top emission type organic el device and top emission type organic el device Download PDFInfo
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- 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
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10S428/917—Electroluminescent
Description
本發明係關於一種有機EL(Electroluminescence)裝置，尤其，關於一種可將其光取出配置於從如薄膜電晶體(TFT(Thin Film Transistor))之驅動電路基板的相反側進行之頂發射型EL裝置的光取出部分之水及氧的捕捉劑、頂發射型EL裝置。The present invention relates to an organic EL (Electroluminescence) device, and more particularly to a top emission type EL device which can be optically taken out and disposed on the opposite side of a driving circuit substrate such as a TFT (Thin Film Transistor). The light is taken out from the water and oxygen trapping agent, and the top emission type EL device.
有機EL裝置係於有機材料中注入電子及電洞，電氣上產生所謂發光材料之有機材料的激發狀態，藉由取出其激發種之基底狀態的緩和時所產生之能量作為光，以進行顯示之下世代的顯示裝置。The organic EL device injects electrons and holes into an organic material, electrically generates an excited state of an organic material of a so-called luminescent material, and extracts energy generated by mitigating the state of the substrate of the excited species as light for display. The next generation of display devices.
有機EL裝置之構造係已提出二種之構造。亦即，從配置有驅動電路之透明電極基板側取出光之底部放射構造、及、與驅動電路基板相反側配置透明電極，驅動電路不被遮蔽，從廣的開口部取出光之頂發射構造。頂發射構造係除了開口部大之外，尚很容易地使直接驅動各像素之薄膜電晶體組入於驅動電路中。The construction of the organic EL device has been proposed in two configurations. In other words, the bottom emission structure of the light is taken out from the side of the transparent electrode substrate on which the drive circuit is disposed, and the transparent electrode is disposed on the side opposite to the drive circuit board, and the drive circuit is not shielded, and the top emission structure of the light is taken out from the wide opening. The top emission structure is such that, in addition to the large opening portion, it is easy to incorporate the thin film transistors directly driving the respective pixels into the driving circuit.
有機EL裝置之作動機構係依據於有機材料進行反覆之氧化還原反應。因此，即使選定使用熱力學上安定的有機材料而與理論速度上的氧及/或水之反應性高，故受到微量之水及氧的影響而性能劣化。The actuation mechanism of the organic EL device is based on a redox reaction of the organic material. Therefore, even if a thermodynamically stable organic material is selected and the reactivity with oxygen and/or water at a theoretical speed is high, the performance is deteriorated by the influence of a trace amount of water and oxygen.
是故，為配置有機EL裝置一般係可使用密封容器，對此必須極力地使氧及/或水分保持於微量以下。因此，有機EL裝置之製作係在超高真空下及/或惰性環境下進行製造操作。Therefore, in order to arrange an organic EL device, a sealed container can be generally used, and it is necessary to keep oxygen and/or moisture to a minimum of a minimum. Therefore, the production of the organic EL device is carried out under an ultra-high vacuum and/or an inert environment.
進一步，就有機EL裝置之構成而言，係可量藉由將捕捉從源自材料之釋氣及/或密閉容器的密閉部份侵入的劣化因子之捕捉劑配置於電子裝置內，俾儘可能地減少此等之影響。Further, in the configuration of the organic EL device, it is possible to dispose the trapping agent for capturing a deterioration factor that intrudes from the sealed portion of the material and/or the sealed portion of the sealed container into the electronic device, as much as possible To reduce the impact of these.
但，可除去頂發射型有機EL裝置之氧及水的兩者之捕捉劑其能力充分者係被限制。However, the ability to remove the trapping agent of both oxygen and water of the top emission type organic EL device is limited.
在專利文獻1中，係亦揭示一種使用對水及氧具有非常高之反應性的鹼(土族)金屬類作為捕捉劑的發明，但其處理性為明顯地伴隨危險之煩雜者，調配於裝置內之情形亦其方法受到限制。進一步，配置此等之裝置會於廢棄處分或事故等被破壞，曝露於一般之大氣環境中的高濃度之水及/或氧時，有可能自然發火。Patent Document 1 also discloses an invention in which an alkali (earth) metal having a very high reactivity with water and oxygen is used as a scavenger, but the handleability is a troublesome person who is obviously accompanied by danger, and is formulated in a device. The situation inside is also limited. Further, the device in which such a device is disposed may be destroyed in an abandonment or accident, and may be naturally ignited when exposed to a high concentration of water and/or oxygen in a general atmospheric environment.
在專利文獻2記載的方法中，係藉由使用複數之材料，可細微地調整具捕捉能。但，其方法係依非常繁雜之複數的加工步驟而製作目的之捕捉劑成型體，難謂簡單之方法。又，於有機EL裝置中調配其成形體中，係使製作裝置之步驟以外的成形體配置於裝置內之步驟成為必須的。進一步，在頂發射型裝置中配置其成形體之處無法充分地形成於裝置內之問題仍存在。In the method described in Patent Document 2, the capturing energy can be finely adjusted by using a plurality of materials. However, the method is a simple method in which a target capturing agent molded body is produced in accordance with a very complicated processing step. In addition, in the molded article of the organic EL device, it is necessary to arrange the molded body other than the step of the production device in the device. Further, there is still a problem that the formation of the formed body in the top emission type device cannot be sufficiently formed in the apparatus.
另外，於專利文獻3中，其特徵在於：使用構成有機EL層之材料作為捕捉劑。但，與水及/或氧之反應速度係接受電子乃至電洞，亦即，在於激發狀態之有機材料係明顯地很快速。因此，被提出來作為捕捉劑之有機材料本質上要保持其高功能，尚有疑問，進一步，有關透明性，含有雜元素(氧、氮、硫等)之有機材料亦會劣化之情形下進行著色一般為已知，即使捕捉劑層很薄，亦有可能成為問題。Further, Patent Document 3 is characterized in that a material constituting the organic EL layer is used as a scavenger. However, the rate of reaction with water and/or oxygen accepts electrons and even holes, that is, the organic material in the excited state is significantly faster. Therefore, it is in doubt that the organic material proposed as a trapping agent has to maintain its high function in essence, and further, the transparency, the organic material containing a hetero element (oxygen, nitrogen, sulfur, etc.) is also deteriorated. Coloration is generally known, and even if the capture agent layer is thin, it may become a problem.
如此地，以往之捕捉劑係不太可捕捉氧及水之兩者，即使有，處理亦危險者。又，為使用於頂發射型有機EL裝置，亦必須滿足透光性之要求。As described above, conventional capture agents are less likely to capture both oxygen and water, and if they are, they are dangerous to handle. Further, in order to be used in a top emission type organic EL device, it is also necessary to satisfy the requirements of light transmittance.
[專利文獻1]特開2002－008852號公報[專利文獻2]特開2005－270959號公報[專利文獻3]特開2006－004721號公報[Patent Document 1] JP-A-2005-270959 (Patent Document 3) JP-A-2006-004721
本發明之課題在於提供一種處理容易，且光學特性優並且對水及氧之捕捉能高的頂發射型有機EL裝置用之捕捉劑。An object of the present invention is to provide a trapping agent for a top emission type organic EL device which is easy to handle, has excellent optical characteristics, and has high capture energy for water and oxygen.
本發明之課題在於提供一種可高品質的顯示且水或氧之影響很小，並且壽命長之頂發射型有機EL裝置。An object of the present invention is to provide a top emission type organic EL device which can exhibit high quality and which has little influence of water or oxygen and has a long life.
若依本發明，可提供一種頂發射型有機EL裝置有機電子裝置用捕捉劑，其特徵在於：由以下述化學式所示之化合物所構成者；R1R2R3M(R1、R2及R3係分別由選自氫原子、烷基、烯基、炔基、環式烷基、芳基、烷氧基、羧基、硫醇及2級肢基所構成之群的一種者，且可互為相同，亦可為相異，但選擇如具有1個以上之M－C鍵者；M為鋁或硼)。According to the present invention, there is provided a trapping agent for an organic electron device for a top emission type organic EL device, which is characterized by comprising a compound represented by the following chemical formula; R1R2R3M (R1, R2 and R3 are respectively selected from hydrogen) a group consisting of an atom, an alkyl group, an alkenyl group, an alkynyl group, a cyclic alkyl group, an aryl group, an alkoxy group, a carboxyl group, a thiol, and a second-order limb group, and may be the same or may be a phase Different, but if it has one or more M-C bonds; M is aluminum or boron).
此處，亦可以使前述化合物及黏結劑溶解於溶劑中而成之方式構成。Here, the compound and the binder may be dissolved in a solvent.
又若依本發明，可提供一種頂發射型有機EL裝置，其特徵在於：將前述捕捉劑配置於頂發射型有機EL裝置之光取出部分而成者。Further, according to the present invention, a top emission type organic EL device can be provided, wherein the trapping agent is disposed in a light extraction portion of a top emission type organic EL device.
本發明之捕捉劑係處理容易且水及氧之捕捉能均極優，且即使極微濃度亦可發揮充分的功能，又透光性等亦優，故可適於能寬廣地採取開口部之頂發射型有機EL裝置，同時並可大幅地改善發光壽命。又，本發明之捕捉劑係可使捕捉劑溶液形成均一的溶液，故可藉由塗佈法配置於頂發射型有機EL裝置之各式各樣的位置。The scavenger of the present invention is easy to handle, and has excellent water and oxygen capture energy, and can exhibit sufficient functions even at a very small concentration, and has excellent light transmittance, etc., so that it can be suitably used to broadly adopt the top of the opening. The emission type organic EL device can simultaneously greatly improve the luminescence lifetime. Further, since the scavenger of the present invention allows the scavenger solution to form a uniform solution, it can be disposed in various positions of the top emission type organic EL device by a coating method.
又，若依本發明之頂發射型有機EL裝置，可抑制因水或氧造成之壽命降低，發揮可謀求長壽命化之效果。Moreover, according to the top emission type organic EL device of the present invention, it is possible to suppress the decrease in the life due to water or oxygen, and to achieve an effect of prolonging the life.
以下說明有關本發明之實施形態的頂發射型有機EL裝置用之水及氧之捕捉劑、頂發射型有機EL裝置。Hereinafter, a water and oxygen trapping agent and a top emission type organic EL device for a top emission type organic EL device according to an embodiment of the present invention will be described.
本發明之實施形態的水及氧捕捉劑之特徵係表示於下述式(1)之化合物單獨、顯示可減少水及氧之2官能性之點，優於至今在有機EL面板所研究之各種捕捉劑。The water and the oxygen scavenger according to the embodiment of the present invention are characterized by the fact that the compound of the following formula (1) alone exhibits a bifunctionality capable of reducing water and oxygen, and is superior to various types of organic EL panels which have been studied so far. Capture agent.
R1R2R3M………(1)R1R2R3M.........(1)
式(1)中，R1、R2及R3係分別獨立地由選自氫原子、烷基、烯基、炔基、環式烷基、芳基、烷氧基、羧基、硫醇基及2級肢基所構成之群的一種者，且可互為相同，亦可為相異，但選擇如具有1個以上之C－M鍵者；此處M為鋁或硼。R1、R2、R3之基係宜為碳數1~20，更宜為2~18，可為相同，亦可為相異。此等之化合物係藉由水分、氧等與此C－M鍵反應，俾發揮可用來作為有機EL裝置用捕捉劑的功能。In the formula (1), R1, R2 and R3 are each independently selected from the group consisting of a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, a cyclic alkyl group, an aryl group, an alkoxy group, a carboxyl group, a thiol group and a second stage. One of the groups consisting of the limb bases may be the same or different from each other, but may be selected such as having one or more C-M bonds; where M is aluminum or boron. The basis of R1, R2 and R3 is preferably from 1 to 20 carbon atoms, more preferably from 2 to 18, which may be the same or different. These compounds react with the C-M bond by moisture, oxygen, etc., and exhibit a function as a scavenger for an organic EL device.
與水之反應係如下式所示。The reaction with water is as shown in the following formula.
C－M＋H2 O → C－H＋M (OH)C-M+H 2 O → C-H+M (OH)
與氧之反應係如下式所示。The reaction with oxygen is as shown in the following formula.
2C－M＋O2 → 2C－O－M2C-M+O 2 → 2C-O-M
前述式(1)之R1、R2及R3之具體例係可適當地舉例：氫、甲基、乙基、丙基、丁基、戊基、己基、庚基、辛基、壬基、癸基、十一碳烷基、十二碳烷基、十六碳烷基、十八碳烷基之碳數1~18的碳基、丙烯基、丁烯基、辛烯基、十二碳烯基、十八碳烯基之具有不飽和基的烯基、丙炔基、苯基乙炔基之炔基、環丙基、環己基之脂環式烷基、苯基、苯甲基之芳基、乙氧基、丙氧基、丁氧基等之烷氧基等。此等烷基、烯基、炔基、烷氧基係可為直鏈狀，亦可為環狀，亦可進行分枝。Specific examples of R1, R2 and R3 of the above formula (1) are suitably exemplified: hydrogen, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, decyl, fluorenyl , undecyl, dodecyl, hexadecyl, octadecyl, carbon, propylene, butenyl, octenyl, dodecenyl An alkenyl group having an unsaturated group of an octadecenyl group, an alkynyl group of a propynyl group, a acetylethynyl group, a cyclopropyl group, an alicyclic alkyl group of a cyclohexyl group, a phenyl group, an aryl group of a benzyl group, An alkoxy group such as an ethoxy group, a propoxy group or a butoxy group. These alkyl groups, alkenyl groups, alkynyl groups, and alkoxy groups may be linear or cyclic, and may be branched.
以前述式(1)所示之化合物的具體例，可舉例如三乙基鋁、三正丙基鋁、三異丙基鋁、三環丙基鋁、三正丁基鋁、三異丁基鋁、三第三丁基鋁、三－2－甲基丁基鋁、三正己基鋁、三環己基鋁、三(2－乙基己基)鋁、三－正辛基鋁、三正癸基鋁、三苯基鋁、三苯甲基鋁、二甲基苯基鋁、二丁基苯基鋁、二異丁基苯基鋁、甲基二苯基鋁、乙氧基二乙基鋁、乙氧基二正辛基鋁、三乙基硼、三丁基硼、三正辛基硼、三正十二烷基硼、三苯基硼等。此等之化合物係可單獨，或混合2種類以上之化合物而使用。Specific examples of the compound represented by the above formula (1) include, for example, triethyl aluminum, tri-n-propyl aluminum, triisopropyl aluminum, tricyclopropyl aluminum, tri-n-butyl aluminum, and triisobutyl group. Aluminum, tri-tert-butyl aluminum, tri-2-methylbutyl aluminum, tri-n-hexyl aluminum, tricyclohexyl aluminum, tris(2-ethylhexyl)aluminum, tri-n-octyl aluminum, tri-n-decyl Aluminum, triphenylaluminum, trityl aluminum, dimethylphenylaluminum, dibutylphenylaluminum, diisobutylphenylaluminum, methyldiphenylaluminum, ethoxydiethylaluminum, Ethoxydi-n-octyl aluminum, triethyl boron, tributyl boron, tri-n-octyl boron, tri-n-dodecyl boron, triphenyl boron, and the like. These compounds can be used singly or in combination of two or more kinds of compounds.
若考慮於與水分、氧等之反應所產生的生成物之蒸氣壓，碳數為8以上之基，較佳係三正辛基鋁、三－正癸基鋁、三－正十二烷基鋁等。若考慮捕捉劑組成物，較佳係三正辛基鋁、三－正癸基鋁。Considering the vapor pressure of the product produced by the reaction with water, oxygen, etc., the carbon number is 8 or more, preferably tri-n-octyl aluminum, tri-n-decyl aluminum, tri-n-dodecyl group. Aluminum and so on. When considering the trapping agent composition, it is preferably tri-n-octyl aluminum or tri-n-decyl aluminum.
本發明之實施型態所使用的捕捉劑之黏結劑的種類，可為無機系之材料，亦可為有機系之材料。The type of the binder of the capturing agent used in the embodiment of the present invention may be an inorganic material or an organic material.
無機系黏結劑可舉例如烷氧基矽烷的聚合物。烷氧基矽烷可舉例如四甲氧基矽烷、甲基三甲氧基矽烷、乙基三甲氧基矽烷、二甲氧基二甲基矽烷、二甲氧基二乙基矽烷、四乙氧基矽烷、甲基三乙氧基矽烷、乙基三乙氧基矽烷、二乙氧基二甲基矽烷、二乙氧基二乙基矽烷、二甲氧基甲基苯基矽烷等。又，為提升塗膜強度，亦可添加少量之烷氧基鋯。The inorganic binder may, for example, be a polymer of an alkoxysilane. The alkoxydecane may, for example, be tetramethoxydecane, methyltrimethoxydecane, ethyltrimethoxydecane, dimethoxydimethyldecane, dimethoxydiethyldecane or tetraethoxydecane. And methyl triethoxy decane, ethyl triethoxy decane, diethoxy dimethyl decane, diethoxy diethyl decane, dimethoxymethyl phenyl decane, and the like. Further, in order to increase the strength of the coating film, a small amount of zirconium alkoxide may be added.
烷氧基矽烷的聚合物係於烷氧基矽烷中添加水0.1mol%以上，進一步添加極微量酸或鹼作為觸媒，產生反應。不添加觸媒而亦可藉加熱產生聚合反應。使反應溶液以高溫進行濃縮乾燥，俾可得到聚合物，但宜再溶解於溶劑中而保存。The polymer of the alkoxy decane is added to the alkoxy decane by adding 0.1 mol% or more of water, and a very small amount of an acid or a base is further added as a catalyst to cause a reaction. The polymerization reaction can also be carried out by heating without adding a catalyst. The reaction solution is concentrated and dried at a high temperature to obtain a polymer, but it is preferably dissolved in a solvent and stored.
有機系黏結劑係可使用不與捕捉劑之透明樹脂。例如丙烯酸樹脂、苯乙烯樹脂等。又，可使用液狀聚合物、石油樹脂作為有機黏結劑。液狀聚合物可舉例如液狀聚丁烯、液狀聚丁二烯等。石油樹脂係可舉例如日石Neopolymer等。進一步，有機黏結劑可使用各種之橡膠。例如，亦可使用苯乙烯－丁二烯橡膠、聚異丁二烯、聚丁二烯、丁基橡膠等。As the organic binder, a transparent resin which does not have a scavenger can be used. For example, an acrylic resin, a styrene resin or the like. Further, a liquid polymer or a petroleum resin can be used as the organic binder. The liquid polymer may, for example, be liquid polybutene or liquid polybutadiene. The petroleum resin may, for example, be a Japanese stone Neopolymer or the like. Further, various rubbers can be used for the organic binder. For example, styrene-butadiene rubber, polyisobutadiene, polybutadiene, butyl rubber, or the like can also be used.
又亦可混合有機系黏結劑與無機系黏結劑，亦可為預先反應之混成型的樹脂。就混成型之樹脂，可舉例如Kaneka Gemlac等丙烯酸聚矽氧系。藉由使此等之透明樹脂溶解於有機溶劑中，可製作塗膜形成用溶液。樹脂溶液之濃度係使用10wt%以上，宜為20~80wt%。Alternatively, the organic binder and the inorganic binder may be mixed, or may be a pre-reacted mixed resin. The resin to be mixed and molded may, for example, be an acrylic polyoxyl system such as Kaneka Gemlac. A solution for forming a coating film can be produced by dissolving such a transparent resin in an organic solvent. The concentration of the resin solution is 10% by weight or more, preferably 20 to 80% by weight.
捕捉劑塗膜之製作係於黏結劑溶液中相對於黏結劑之固形分添加含有本發明化合物之捕捉劑10wt%以上較佳係20~80wt%，充分攪拌，得到均一的溶液。在惰性環境下，使此捕捉劑溶液塗佈於頂發射型有機EL裝置之密封基板、例如上蓋玻璃基板、或前述裝置之所希望的位置後，餾去揮發成分。塗佈方法係可為旋塗器、噴塗器、輥塗器、噴塗器、液滴吐出法、點膠機等之方法，並無特別限定。成膜溫度為50℃以上，宜為100~200℃，只要可除去塗佈溶液之溶劑等的揮發成分即可，並無特別限定。The capture agent coating film is prepared by adding 10% by weight or more, preferably 20 to 80% by weight, of the capturing agent containing the compound of the present invention to the solid content of the binder in the binder solution, and sufficiently stirring to obtain a uniform solution. The trapping agent solution is applied to a sealing substrate of a top emission type organic EL device, for example, a cover glass substrate or a desired position of the apparatus in an inert atmosphere, and then the volatile component is distilled off. The coating method may be a method such as a spinner, a sprayer, a roll coater, a sprayer, a droplet discharge method, or a dispenser, and is not particularly limited. The film formation temperature is 50° C. or higher, and preferably 100 to 200° C., and the volatile component such as a solvent of the coating solution can be removed, and is not particularly limited.
組成物之塗佈方法係可使用旋塗法、輥塗法、簾塗法、浸塗法、噴塗法、液滴吐出法等之方法，並無特別限定。較佳係噴墨方式。The coating method of the composition is not particularly limited, and may be a method such as a spin coating method, a roll coating method, a curtain coating method, a dip coating method, a spray coating method, or a droplet discharge method. It is preferably an ink jet method.
成膜溫度為50℃以上，更宜為100~150℃。只要可充分地除去塗佈溶液之溶劑的溫度即可，並無特別限定。The film formation temperature is 50 ° C or higher, and more preferably 100 to 150 ° C. The temperature of the solvent of the coating solution can be sufficiently removed, and is not particularly limited.
本發明之實施形態的頂發射型有機EL裝置用水及氧之捕捉劑係處理容易且水及氧之捕捉能均極優。又，即使極微濃度亦可發揮充分的功能，光學特性(可見光透過性及折射率)均優。前述捕捉材之代表性光學特性係可見光區域(400~800nm)之光的透過率為95%以上，且使用折射率(波長：589.3nm(鈉D線)；在20℃中)為1.2~1.8。如此地，光學特性優，故可適於能寬廣地採取開口部之頂發射型有機EL裝置，同時並可大幅地改善前述有機EL裝置之發光壽命。The top emission type organic EL device according to the embodiment of the present invention is easy to handle with water and oxygen trapping agent, and has excellent water and oxygen capture energy. Further, even a very small concentration can exhibit a sufficient function, and optical characteristics (visible light transmittance and refractive index) are excellent. The representative optical characteristics of the above-mentioned trapping material are that the transmittance of light in the visible light region (400 to 800 nm) is 95% or more, and the refractive index (wavelength: 589.3 nm (sodium D line); at 20 ° C) is 1.2 to 1.8. . As described above, since the optical characteristics are excellent, it is suitable for a top emission type organic EL device which can adopt an opening portion in a wide range, and the luminescence lifetime of the organic EL device can be greatly improved.
又，本發明之實施形態的捕捉劑係可使捕捉劑溶液形成均一的溶液。故藉塗佈法而可配置於頂發射型有機EL裝置之各式各樣的位置。Further, the scavenger according to the embodiment of the present invention allows the scavenger solution to form a uniform solution. Therefore, it can be disposed in various positions of the top emission type organic EL device by the coating method.
又，若依本發明之頂發射型有機EL裝置(從如薄膜電晶體之驅動電路基板之相反側的光取出部分進行其光取出之有機EL裝置)，將可見光區域中之光透過率等的光學特性優之有機金屬化合物配置於前述光取出部分，亦不使其裝置特性品質劣化，因作用為水及氧捕捉劑，故可進行高品質之顯示，同時並可謀求長壽命化。Further, according to the top emission type organic EL device of the present invention (the organic EL device which extracts light from the light extraction portion on the opposite side of the drive circuit substrate of the thin film transistor), the light transmittance in the visible light region or the like is obtained. The organometallic compound having excellent optical properties is disposed in the light-extracting portion, and does not deteriorate the device characteristic quality. Since it acts as a water and an oxygen scavenger, it can exhibit high-quality display and can also have a long life.
於已充分乾燥之流動石蠟的50%甲苯溶液100g中使三辛基鋁100g均一地溶解而製作捕捉劑溶液。使前述捕捉劑溶液以噴墨法塗佈於500μm厚玻璃基板每單位RGB像素面積單位後，以140℃加熱成膜20分鐘。其次，從具有薄膜電晶體元件之基板側層合Al/Ca作為陰極，層合高分子型之各RGB的發光像素作為發光層，層合導電性高分子(Bayer公司製之PEDOT－PSS)作為電洞注入層，層合附有ITO玻璃基板(500μm厚)作為陽極，於其上，於面板全體之密封貼合附捕捉劑之玻璃。所得到之頂發射型有機EL裝置係顯示優異之發光亮度，無黑點(非發光點)之生成，顯示發光壽命亦良好的值。100 g of trioctyl aluminum was uniformly dissolved in 100 g of a 50% toluene solution of the well-dried mobile paraffin to prepare a trap solution. The above-mentioned trapping agent solution was applied by an inkjet method to a 500 μm-thick glass substrate per unit RGB pixel area unit, and then formed into a film at 140 ° C for 20 minutes. Next, Al/Ca is laminated as a cathode from a substrate side having a thin film transistor element, and RGB light-emitting pixels of a laminated polymer type are used as a light-emitting layer, and a conductive polymer (PEDOT-PSS manufactured by Bayer Co., Ltd.) is laminated as a cathode. The hole injection layer was laminated with an ITO glass substrate (500 μm thick) as an anode, and the glass of the trapping agent was attached to the entire panel. The obtained top emission type organic EL device exhibited excellent light emission luminance, and no black spots (non-light-emitting points) were generated, and the light-emitting lifetime was also good.
於圖1中顯示三辛基鋁之脫水性能。圖1係載置於鋁皿中乾燥固化之三辛基鋁1.5g而密閉之內容積640cm3 的容器中，以靜置於容器內之濕度感測器測定容器內之濕度的隨時間變化之結果。與氧化鈣、及Hope製藥製Olive AOO(主成分：氧化鋁辛酸酯)比較作為比較對象。三辛基鋁(圖1之曲線A)係對於比較對象之2個捕捉劑，而顯示優異之吸濕能力。The dehydration performance of trioctyl aluminum is shown in FIG. Figure 1 is a container of 1.5 g of dry-solidified trioctyl aluminum in an aluminum dish and sealed in a volume of 640 cm 3 . The humidity in the container is measured with time by a humidity sensor placed in the container. result. It was compared with calcium oxide and Olive AOO (main component: alumina octanoate) manufactured by Hope Pharmaceuticals. Trioctyl aluminum (curve A of Figure 1) showed excellent moisture absorption capacity for the two capture agents of the comparison object.
於圖2中顯示三辛基鋁之脫氧性能。測定係與圖1之脫水性能的情形同樣做法而實施。又，三辛基鋁係使用2.0克，以氧感測器測定容器內之氧濃度的隨時間變化。如圖2所示般，三辛基鋁(圖2之曲線A)係顯示優異之脫氧能力。The deoxidation performance of trioctyl aluminum is shown in FIG. The measurement was carried out in the same manner as in the case of the dehydration performance of Fig. 1. Further, 2.0 g of trioctyl aluminum was used, and the oxygen concentration in the vessel was measured with time by an oxygen sensor. As shown in Fig. 2, trioctyl aluminum (curve A of Fig. 2) shows excellent deoxidation ability.
於使二環戊基甲基丙烯酸酯(日立化成製FA－513M)以AIBN(偶氮雙異丁腈)聚合之50wt%二甘醇二甲醚100g添加三－正十二烷基鋁100g而均一地混合溶解。使用前述組成物作為捕捉劑，與實施例1同樣地製作之頂發射型有機EL裝置基板係顯示良好的發光亮度，無黑點之生成，發光壽命亦良好。Addition of dicyclopentyl methacrylate (FA-513M manufactured by Hitachi Chemical Co., Ltd.) to 100 g of 50 wt% diglyme polymerized by AIBN (azobisisobutyronitrile) was added to 100 g of tri-n-dodecylaluminum. Mix and dissolve uniformly. Using the above-described composition as a scavenger, the top emission type organic EL device substrate produced in the same manner as in Example 1 exhibited good luminance, no black spots were formed, and the luminescence lifetime was also good.
與實施例1相同之捕捉劑組成物以噴墨法，在薄膜電晶體元件基板側之像素部附近塗佈於配線間之空間，以140℃加熱成膜20分鐘。配置高分子型之各RGB的發光像素，貼合500μm之厚玻璃板，進行密封。所得到之頂發射型有機EL裝置面板係初期顯示良好的發光亮度，但為於配線間配置捕捉劑，其絕對量很少，故黑點從初期顯現，發光壽命亦比實施例1短。The same trapping agent composition as in Example 1 was applied to the space between the wirings in the vicinity of the pixel portion on the side of the thin film transistor element by an inkjet method, and formed into a film at 140 ° C for 20 minutes. Each of the RGB luminescent pixels of the polymer type was placed, and a 500 μm thick glass plate was bonded and sealed. The obtained top emission type organic EL device panel showed excellent light emission luminance at the beginning, but the amount of the capture agent disposed between the wiring lines was small, so that the black spots appeared from the initial stage and the light emission lifetime was shorter than that of the first embodiment.
頂發射型有機EL裝置係可於光取出部分等之各種位置配置水及氧之捕捉劑。In the top emission type organic EL device, a water and oxygen trapping agent can be disposed at various positions such as a light extraction portion.
圖1係顯示本發明之實施例的頂發射型有機EL裝置用捕捉劑之捕水性能特性。Fig. 1 is a graph showing the water trapping performance characteristics of a scavenger for a top emission type organic EL device according to an embodiment of the present invention.
圖2係顯示本發明之實施例的頂發射型有機EL裝置用捕捉劑之脫氧性能特性。Fig. 2 is a graph showing the deoxidation performance characteristics of a scavenger for a top emission type organic EL device of an embodiment of the present invention.
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