TW560226B

TW560226B - OLED device

Info

Publication number: TW560226B
Application number: TW91125128A
Authority: TW
Inventors: Yung-Chih Lee; Wei-Su Chen; Chi-Chih Liao; Jiun-Haw Lee
Original assignee: Ritdisplay Corp
Priority date: 2002-10-25
Filing date: 2002-10-25
Publication date: 2003-11-01

Abstract

An OLED device comprises a substrate, a cathode layer, a luminescence layer, a hole block layer and an anode layer. The cathode layer is disposed on the substrate; the luminescence layer is disposed on the cathode layer; the hole block layer is disposed on the luminescence layer; the cathode layer is disposed on the hole block layer. In addition, the luminescence layer comprises a hole transparent material and a phosphorus material, wherein the weight percentage of the hole transparent material and the phosphorus material is between 40% to 60%.

Description

560226 五、發明說明（1) 本發明是有關於一種有機電激發光元件（0LED)，且特別是有關於一種將電洞傳導材料、嶙光材料摻雜於有機材料中以作為發光層之有機電激發光元件。資訊通訊產業已成為現今的主流產業，特別是攜帶型的各式通訊顯示產品更是發展的重點，而平面顯示器為人與資訊的溝通界面，因此顯得特別重要。現在應用在平面顯示器的技術主要有下列幾種：電漿顯示560226 V. Description of the invention (1) The present invention relates to an organic electroluminescent device (0LED), and in particular, to a doped hole conductive material and a phosphorescent material doped in an organic material as a light emitting layer. Electromechanical excitation light element. The information and communication industry has become the mainstream industry today, especially the various portable communication display products are the focus of development, and the flat panel display is the communication interface between people and information, so it is particularly important. The following technologies are currently applied to flat panel displays: plasma display

Display Panel ，PDP)、液晶顯示器（LiqiJd crystalDisplay Panel (PDP), LiqiJd crystal

Display，LCD)、無機電激發光顯示器 (Electro-luminescent Display)、發光二極體陣列顯示器（Light Emitting Diode ’LED)、真空營光顯示器 (Vacuum Fluorescent Display)、場致發射顯示器（Field Emission Display ，FED)以及電變色顯示$ (Electro-chromic Display)等。然而，相較於其他平面顯示技術，有機電激發光顯示器以其自發光、無視角依存、省電、製程簡易、低成本、低操作溫度範圍、高應答速度以及全彩化等優點而具有極大的應用潛力，可嗲^ ^ 下一代的平面顯示器之主流。成為有機電激發光元件係一種利用有機官能性材料 (organic functional materials)的自發光的特性來達到顯示效果的元件，可依照有機官能性材料的分子量不同分為小分子有機發光元件（small molecule OLED， SM-OLED) 與高分子有機發光元件（polymer light-emitting device， PLED)兩大類。Display (LCD), inorganic electro-luminescent display (Electro-luminescent Display), light-emitting diode array display (Light Emitting Diode 'LED), vacuum camping light display (Vacuum Fluorescent Display), field emission display (Field Emission Display, FED) and $ -Electro-chromic Display. However, compared to other flat display technologies, organic electroluminescent displays have great advantages due to their self-emission, no viewing angle dependence, power saving, simple process, low cost, low operating temperature range, high response speed, and full color. The application potential can be the mainstream of the next generation of flat panel displays. The organic electroluminescent device is a device that uses the self-luminous properties of organic functional materials to achieve display effects. It can be divided into small molecule OLEDs according to the molecular weight of the organic functional materials. (SM-OLED) and polymer light-emitting device (PLED).

10194twf.ptd 第5頁 560226 五、發明說明（2) 對於有機電激發光元件而言，其在亮度與發光效率的表現是很重要的，故如何增加有機發光二極體之亮度和效率是當前重要的課題。目前有機電激發光元件中的發光層多採用螢光材料，但以登光材^作為發光層並無法達到理想的亮度與發光效率，因此，藉由磷光材料發光的技術相繼被提出。一般常· 見的磷光材料發光方式可略分為兩種： (1 )直接以磷光材料作為發光層。此方式將會使得元 · 件本身的發光效率（c d / A)隨著電壓或電流的增加而快速衰減’且其色座標會隨著亮度上升而發生改變。況且，一般 - 使用磷光材料作為發光層的元件並無法在如此低的電壓下達到所需之亮度。 _ (2 )將磷光材料（G u e s t )以丨％〜丨〇 % 的比例摻雜於其他發光材料（Η 〇 s t)中作為發光層，藉由發光材料（η 〇 s t)產生能量轉移（energy transfer)來使得磷光材料（Guest)發光，其色座標亦會隨著亮度上升而發生改變，此方式對於亮度與發光效率的提昇十分有限。因此’本發明的目的在提出一種發光層以及應用此發光層之有機電激發光元件，其可有效地提昇亮度以及發光效率。本發明的另一目的在提出一種發光層以及應用此發光層之有機電激發光元件，其可使得色座標與發光效率不會 _ 隨著電壓或電流的上昇而下降，以改善色座標與發光效率的衰減率。10194twf.ptd Page 5 560226 V. Description of the invention (2) For organic electroluminescent devices, their performance in brightness and luminous efficiency is very important, so how to increase the brightness and efficiency of organic light-emitting diodes is currently Important subject. At present, fluorescent materials are mostly used as the light-emitting layer in the organic electroluminescent device, but the use of the light-emitting layer ^ as the light-emitting layer cannot achieve the desired brightness and luminous efficiency. Therefore, technologies using phosphorescent materials to emit light have been proposed one after another. Generally, the commonly used phosphorescent materials can be divided into two types: (1) directly using phosphorescent materials as the light-emitting layer. This method will make the luminous efficiency (c d / A) of the element itself decay rapidly with the increase of voltage or current, and its color coordinates will change with the increase of brightness. Moreover, in general-a device using a phosphorescent material as a light emitting layer cannot achieve the required brightness at such a low voltage. _ (2) Doping the phosphorescent material (G uest) into other light-emitting materials (Η ost) at a ratio of 丨% ~ 丨〇% as a light-emitting layer, and energy transfer (energy) is generated by the light-emitting material (η 〇st). transfer) to make the phosphorescent material (Guest) emit light, and its color coordinates will change as the brightness rises. This method has very limited improvements in brightness and luminous efficiency. Therefore, the object of the present invention is to provide a light emitting layer and an organic electroluminescent device using the light emitting layer, which can effectively improve the brightness and light emitting efficiency. Another object of the present invention is to provide a light-emitting layer and an organic electroluminescent device using the light-emitting layer, which can prevent the color coordinates and luminous efficiency from decreasing as the voltage or current increases to improve the color coordinates and luminescence. The decay rate of efficiency.

10194twf.ptd 第6頁 560226 五、發明說明（3) 為達上述雜有一電洞傳導材間。的有錯合基胺 TAZ 件，陰極配置層係有一材料間。料與其中機材物。架構 > TPB 為達其主層所於陽配置電洞與磷磷光，有料，電洞之材 I等上述要係構成極層於電傳導光材之目導材材料機材其材傳導料。 ) 之目由基 0其上；洞阻材料料的 « 3^ 的，本發明提出一種發光層，其為^二料與—磷光材料的有機材料，且電’洞的摻雜濃度介於40%〜60%重量百分^之料例如是小分子的有機材料或是高分子質例如為具有ISOqUin〇l ine取代基的，材料例如為N p B、T P D、T C T A等具有三苯電洞阻擋層之材質例如為BCP、Balq、 % ’本發明提出一種有機電激發光元 & Λ陽極層、發光層、電洞阻擋層以及 + ’陽極層係配置於基板上；發光層係 f洞阻擋層係配置於發光層上；而陰極擔層上。此外，上述之發光層為一摻雜與—磷光材料的有機材料，且電洞傳導才參雜濃度介於40%〜60%重量百分比之本實施例之有施之間例如可選探〖生電激發光元件中，在陽極層與發光層層，其中電洞注入f配置一電洞注入層以及一電洞傳導而電洞傳導層例如=例如係配置於陽極層與發光層之間’ 外，在電洞卩1梓/係配置於電洞注入層與發光層之間。此子注入層以及二^與陰極層之間例如可選擇性地配置一電於電洞阻擋層與险f傳導層’其中電子注入層例如係配置電子注入声盥a :虽層之間，而電子傳導層例如係配置於 « “極層之間。10194twf.ptd Page 6 560226 V. Description of the invention (3) In order to achieve the above, there is a hole conductive material. There are complex amine TAZ pieces, and the cathode configuration layer has a material space. Materials and materials. Architecture > TPB is to configure holes and phosphorescent phosphors in the main layer of the main layer. There are materials, materials of the holes I, etc. The above are the materials that constitute the polar layer for electrically conducting light materials. The purpose of the above) is «3 ^ on the base material; the present invention proposes a light-emitting layer, which is an organic material of phosphorous and phosphorescent material, and the doping concentration of the electric hole is between 40 % ~ 60% by weight ^ The material is, for example, a small-molecular organic material or a high-molecular material, for example, it has an ISOqUinol ine substituent, and the material is, for example, N p B, TPD, TCTA, etc., which has a triphenyl hole barrier. The material of the layer is, for example, BCP, Balq,%. The present invention proposes an organic electro-excitation photon & Λ anode layer, a light-emitting layer, a hole blocking layer, and a + 'anode layer is disposed on the substrate; the light-emitting layer is f-hole blocking The layer system is arranged on the light emitting layer; and the cathode support layer. In addition, the above-mentioned light-emitting layer is an organic material doped with phosphorescent material, and the impurity concentration of the hole conduction is between 40% and 60% by weight. In the electroluminescent device, a hole injection layer and a hole conduction layer are arranged in the anode layer and the light emitting layer layer, and the hole conduction layer is, for example, disposed between the anode layer and the light emitting layer. In the hole, the system is arranged between the hole injection layer and the light emitting layer. This sub-injection layer and the cathode and the cathode layer, for example, may be selectively arranged with an electrical hole blocking layer and a conductive layer. Among them, the electron injection layer is, for example, an electron injection sound chamber a: The electron-conducting layer is, for example, disposed between the «" electrode layers.

560226 五、發明說明（4) 本實施例之有機電激發光元件中，電洞注入層之材質例如為C u P c、m - Μ T D A T A等材料；電洞傳導層之材質例如為 NPB、TPD、TCTA等具有三苯基胺架構之材料等；而電子傳導層之材質例如為A1Q、BeBq2等金屬錯合物及PBD、TAZ、 TPBI等雜環化合物。本實施例之有機電激發光元件中，基板上的陽極層例如為多個條狀之透明電極，其材質例如為銦錫氧化物、銦鋅氧化物、鋁鋅氧化物等透明材質。陰極層例如為多個條狀之金屬電極，其材質例如為鋁、鈣、鎂銀合金等導體材料。而電洞阻擋層之材質例如為BCP、BaU、TAZ、TPBI 等。為讓本發明之上述目的、特徵、和優點能更明顯易懂，下文特舉一較佳實施例，並配合所附圖式，作詳細說明如下：圖式之標示說明 100 基板 102 陽極層 104 發光層 1 0 4 a :具有磷光性質的有機材料 1 0 4 b :電洞傳導材料 1 0 6 :陰極層 1 0 8 :電洞注入層 . 1 1 0 :電洞傳導層560226 V. Description of the invention (4) In the organic electro-optic device of this embodiment, the material of the hole injection layer is, for example, Cu P c, m-Μ TDATA, etc .; the material of the hole conduction layer is, for example, NPB, TPD Materials such as TCTA, TCTA and other materials with triphenylamine structure; and the material of the electron conducting layer are, for example, metal complexes such as A1Q, BeBq2, and heterocyclic compounds such as PBD, TAZ, TPBI. In the organic electroluminescent device of this embodiment, the anode layer on the substrate is, for example, a plurality of strip-shaped transparent electrodes, and the material is, for example, a transparent material such as indium tin oxide, indium zinc oxide, or aluminum zinc oxide. The cathode layer is, for example, a plurality of strip-shaped metal electrodes, and the material is, for example, a conductive material such as aluminum, calcium, or a magnesium-silver alloy. The material of the hole blocking layer is, for example, BCP, BaU, TAZ, TPBI, and the like. In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is given below in conjunction with the accompanying drawings to make a detailed description as follows: Symbols of the drawings 100 Substrate 102 Anode layer 104 Luminous layer 1 0 4 a: Organic material with phosphorescent properties 1 0 4 b: Hole conductive material 106: Cathode layer 108: Hole injection layer 1 1 0: Hole conductive layer

10194twf.ptd 第8頁 560226 五、發明說明（5) 1 1 2 :電子注入層 1 1 4 :電子傳導層 1 1 6 :電洞阻擋層較佳實施例一般的電激發光機制中，光的呈現方式有兩種方式，一種是激發態電子自旋組態為單重態（S i ng 1 e t)，另一種是激發態電子自旋組態為三重態（Tr i p 1 e t)。當激發態電子自旋組態為單重態時，所釋放出來的光稱之為螢光 (Fluorescence)，其組態為： S1 —> SO + hv 當激發態電子自旋組態為三重態時，所釋放出來的光稱之為填光（Phosphorescence)，其組態為： T1 — SO + hv 電激發光的外部量子效率0 E L = χ φ ί η τ η e 。其中，χ 為激發態電子自旋量子數；0 f 為電荷注入發光層效率；7? r 為電子和電洞再結合效率；而7? e為光子的轉換效率。在激發態電子自旋組態為單重態的情況下，電子自旋量子數；k：為0 . 2 5，假設整個發光過程的各種效率均為 1 0 0 %，則實際可得到最大的外部量子效率只有2 5 %。相反的，在激發態電子自旋組態為三重態的情況下，電子自旋量子數；t為〇· 7 5，假設整個發光過程的各種效率均為 1 0 0 %，則實際可得到最大的外部量子效率將可高達7 5 %。由上述可知，使用磷光材料作為發光材料將可獲得較高的10194twf.ptd Page 8 560226 V. Description of the invention (5) 1 1 2: Electron injection layer 1 1 4: Electron conductive layer 1 1 6: Hole blocking layer There are two ways of presentation, one is that the excited state electron spin is configured as a singlet state (Sing 1 et), and the other is that the excited state electron spin is configured as a triplet state (Tr ip 1 et). When the excited electron spin is configured as a singlet, the light released is called fluorescence, and its configuration is: S1 — > SO + hv When the excited electron spin is configured as a triplet At this time, the released light is called Phosphorescence, and its configuration is: T1 — SO + hv External quantum efficiency of the electro-excitation light 0 EL = χ φ η τ η e. Among them, χ is the spin quantum number of the excited electron; 0 f is the efficiency of the charge injection light-emitting layer; 7? R is the recombination efficiency of the electron and the hole; and 7? E is the conversion efficiency of the photon. In the case where the excited electron spin is configured as a singlet, the electron spin quantum number; k: 0.25, assuming that the various efficiencies of the entire light emission process are 100%, the largest external can actually be obtained The quantum efficiency is only 25%. In contrast, in the case where the excited electron spin configuration is a triplet state, the electron spin quantum number; t is 0.75, assuming that the efficiency of the entire light emission process is 100%, the maximum can actually be obtained The external quantum efficiency will be as high as 75%. From the above, it can be known that using a phosphorescent material as a luminescent material will obtain a higher

10194twf.ptd 第9頁 560226 五、發明說明（6) 發光效率。本貫施例之有機電激發光元件是藉由璘光材料來發光’以期獲付較佳的發光效率。此外，本實施例針對習知兩種發光方式的缺點以予改進，進而改善發光效率（c d / A ) 隨著電壓或電流的增加快速衰減、色座標隨著亮度上升發生改變’以及亮度與發光效率不彰等問題。第1圖繪示為依照本發明一較佳實施例有機電激發光元件之剖面示意圖。請參照第1圖，本實施例之有機電激發光元件主要係架構於一基板1 〇〇上，此基板1 0 0例如為玻璃基板、塑膠基板及柔性（flexible)基板等透明基板。基板100上配置有陽極層102、發光層104、陰極層106、電洞注入層 108(Hole Injecting Layer，HIL)、電洞傳導層 110(Hole Transporting Layer，HTL)、電子注入層 112(Electron Injecting Layer ，EIL)、電子傳導層 114(Electron Transporting Layer ，ETL)，以及電洞阻擋層116(Hole Blocking Layer ，HBL)。然而，熟習該項技藝者應知，上述之電洞注入層1 〇 8、電洞傳導層1 1 〇、電子注入層1 1 2、電子傳導層1 1 4以及電洞阻擋層1 1 6可視需求而省略其配置。以下即針對上述各膜層的相對位置、型態以及材質作進一步的說明。基板1 0 0上的陽極層1 0 2例如為多個條狀之透明電極，其材質例如為銦錫氧化物、銦鋅氧化物、鋁鋅氧化物等透明材質；電洞注入層1 0 8覆蓋於陽極層1 0 2上，其材質例如為C u P c、m - Μ T D A T A等材料；電洞傳導層1 1 〇配10194twf.ptd Page 9 560226 5. Description of the invention (6) Luminous efficiency. The organic electro-optical light-emitting element of the present embodiment emits light using a phosphorescent material 'in order to obtain better luminous efficiency. In addition, this embodiment addresses the shortcomings of the conventional two light-emitting methods to improve the light-emitting efficiency (cd / A). It rapidly decays with the increase of voltage or current, the color coordinates change with the increase of brightness, and the brightness and light-emission. Inefficiency. FIG. 1 is a schematic cross-sectional view of an organic electroluminescent device according to a preferred embodiment of the present invention. Please refer to FIG. 1. The organic electroluminescent light emitting element of this embodiment is mainly structured on a substrate 100. The substrate 100 is, for example, a transparent substrate such as a glass substrate, a plastic substrate, and a flexible substrate. The substrate 100 is provided with an anode layer 102, a light emitting layer 104, a cathode layer 106, a hole injecting layer (HIL) 108, a hole transporting layer 110 (HTL), and an electron injection layer 112 (Electron Injecting Layer (EIL), electron conductive layer 114 (Electron Transporting Layer, ETL), and hole blocking layer 116 (Hole Blocking Layer, HBL). However, those skilled in the art should know that the hole injection layer 10, hole conduction layer 1 10, electron injection layer 1 1 2, electron conduction layer 1 1 4 and hole blocking layer 1 1 6 described above are visible. Requirements and omit their configuration. The relative positions, types and materials of the above film layers are further described below. The anode layer 102 on the substrate 100 is, for example, a plurality of strip-shaped transparent electrodes, and the material is, for example, transparent materials such as indium tin oxide, indium zinc oxide, and aluminum zinc oxide; the hole injection layer 108 Covered on the anode layer 102, the material of which is, for example, Cu P c, m-M TDATA, etc .; the hole conductive layer 1 1 〇

l〇194twf.ptd 第10頁 560226 五、發明說明（7) 置於電洞注入層〗n 具有三笨基胺上，其材質例如為NPB、TPD、TCTA等木構之材料。發光層1 〇 4 S己巷士人# 掺雜有電洞傳導^於電洞傳導層110上’發光層104是一 l〇4a。其中 $材料10 4b以及具有磷光性質的有機材料高分子的有機ί ί材，104a例如是小分子的有機材料或是基的銀錯合物.3二f t質例如為具有Isoquin〇nne取代l〇194twf.ptd Page 10 560226 V. Description of the invention (7) Placed on the hole injection layer n It has tribenzylamine, and its material is, for example, NPB, TPD, TCTA and other wooden materials. The light-emitting layer 104 has been doped with hole conduction on the hole-conducting layer 110. The light-emitting layer 104 is a 104a. Among them, material 10 4b and organic materials with phosphorescent properties are high-molecular organic materials. 104a is, for example, a small-molecule organic material or a basic silver complex. 3 The quality of f is, for example, substituted with Isoquinonne.

锺目女- -* ’电洞傳導材料l〇4b例如為NPB、TPD、TCTA 寻兴男二本基復从紐你淡、，. 構之材料。此外，發光層1 0 4内電洞傳 "人_光材料的摻雜濃度例如是40%〜60%重量百分比之間。锺目女--* ’hole-conducting material 104b is, for example, NPB, TPD, TCTA Xun Xing male second base material, which is a material that is based on Niu Dan,. In addition, the dopant concentration in the light-emitting layer 104 can be, for example, between 40% and 60% by weight.

Rrp R 擔層1 1 6配置於發光層104上，其材質例如為 ' a q、TAZ、TPBI等，此電洞阻擋層丨丨6主要功能是將電洞侷限在發光層丨〇 4中，以增進發光效率；電子傳導層1 1 4配置於電洞阻擋層丨丨6上，其材質例如為a 1 Qβ q 2 等金屬錯合物及PBD、TAZ、TPBI等雜環化合物；電子注入層112配置於電子傳導層114上；陰極層1〇6配置於電子注入層1 1 2上，陰極層1 〇 6例如為多個條狀之金屬電極，而其材質例如為鋁、鈣、鎂銀合金等導體材料。The Rrp R carrier layer 1 1 6 is disposed on the light-emitting layer 104. Its material is, for example, 'aq, TAZ, TPBI, etc. This hole blocking layer 丨 6 main function is to confine the hole to the light-emitting layer 〇 4 Improving luminous efficiency; the electron conducting layer 1 1 4 is arranged on the hole blocking layer 丨 6 and its material is, for example, metal complexes such as a 1 Qβ q 2 and heterocyclic compounds such as PBD, TAZ, TPBI; electron injection layer 112 The cathode layer 106 is disposed on the electron-conducting layer 114. The cathode layer 106 is disposed on the electron-injection layer 112. The cathode layer 106 is, for example, a plurality of strip-shaped metal electrodes, and the material is, for example, aluminum, calcium, magnesium-silver alloy. And other conductive materials.

以下即針對有機電激發光元件的發光機制作進一步的說明。在有機電激發光元件的陽極層1 〇 2與陰極層丨〇 6搞接至一電壓之後’由於電場的作用’電子會由陰極層注入到發光層1 0 4的L U Μ 0層而形成負極化子，電洞則會由陽極層1 02注入到發光層1 04的HOMO層而形成正極化子θ。正極化子與負極化子分別往相對方向移動，在發光層丨〇 4内結The following is a further description of the production of a light emitting device for an organic electroluminescent device. After the anode layer 102 and the cathode layer of the organic electroluminescent device are connected to a voltage, 'due to the action of the electric field', electrons will be injected from the cathode layer to the LU M 0 layer of the light emitting layer 104 to form a negative electrode. Positons, holes will be injected from the anode layer 102 into the HOMO layer of the light emitting layer 104 to form a positive anion θ. The positive positron and the negative positron respectively move in opposite directions, and they are combined in the light-emitting layer.

10194twf.ptd 第11頁 560226 五、發明說明（8) 合形成單態激子（e X c i t ο η )，發光層1 〇 4内部分的單態激子會以電激發光的方式釋放出多餘能量以回到基態。10194twf.ptd Page 11 560226 V. Description of the invention (8) A singlet exciton (e X cit ο η) is formed, and the singlet exciton in the light emitting layer 104 will release the excess by means of electrical excitation light. To return to the ground state.

本實施例中，由於電洞傳導材料1 0 4 b與具有磷光性質的有機材料104a相較具有較低HOMO，故未與電子結合 (recombination)的多餘電洞便會被阻陷（trap)在發光層 1 0 4中的電洞傳導材料1 〇 4 b内，發生所謂電洞阻陷（η 〇 1 e happing)的情形。由於電洞阻陷的緣故，被限制在發光層1 0 4中的電洞與電子於此結合的機率增加（單態激子形成的機率增加），故本實施例可藉由摻雜於發光層丨〇 4中 =電洞傳導材料1 〇 4 b來限制電洞的位置，進而達到改善石粦與=料，色座標、降低發光效率的衰減率、提高發光效率 ^ =度等目的。除此之外，本實施例之色座標並不會隨著姿的上昇而大幅改變。件中ί 2圖緣示依照本發明一較佳實施例有機電激發光元一骨度與發光效率之關係圖，而第3圖繪示依照本發明圖較佳實施例有機電激發光元件中色座標與電壓的關係欵率由第^圖^中可清楚得知，本實施例可使得元件的發光 3围Υ達$到>最高，且令元件的發光效率衰減率降低。而由第可清楚得知，本實施例之色座標並不會因電壓的上升有大幅度的改變。優點^上所述’本發明之有機電激發光元件至少具有下列In this embodiment, since the hole conductive material 1 0 4 b has a lower HOMO than the organic material 104 a having phosphorescent properties, excess holes that are not combined with electrons will be trapped in the hole. In the hole conductive material 1 0 4 b in the light emitting layer 104, a so-called hole trapping (η 0 1 e happing) occurs. Due to hole trapping, the probability of holes and electrons confined in the light emitting layer 104 to increase here (increasing probability of singlet exciton formation), so this embodiment can be doped by light doping In the layer 丨〇4 = hole conductive material 1 〇4b to limit the position of the hole, and then to achieve the purpose of improving the stone material and material, color coordinates, reducing the decay rate of luminous efficiency, and improving the luminous efficiency ^. In addition, the color coordinates of this embodiment do not change significantly with the rise of the posture. Figure 2 shows the relationship between the degree of luminescence and the luminous efficiency of the organic electro-excitation light element according to a preferred embodiment of the present invention, and FIG. 3 shows the organic electro-excitation light element according to the preferred embodiment of the present invention. The relationship between the color coordinates and the voltage can be clearly understood from FIG. ^. In this embodiment, the light emission of the device can be as high as $ to>, and the luminous efficiency attenuation rate of the device is reduced. It can be clearly seen from the section that the color coordinates of this embodiment will not change greatly due to the voltage rise. Advantages ^ As described above, the organic electroluminescent device of the present invention has at least the following

材粗1 ·本發明之有機電激發光元件中，將摻雜有電洞傳導、具有磷光性質的有機材料作為有機電激發光元件的Material thickness1 · In the organic electroluminescent device of the present invention, an organic material doped with holes and having phosphorescent properties is used as the organic electroluminescent device.

1019〜._ 560226 五、發明說明（9) 發光層，對於元件在亮度、發光效率上有所提昇。 2 .本發明之有機電激發光元件中，將摻雜有電洞傳導材料、具有磷光性質的有機材料作為有機電激發光元件的發光層，能夠讓元件之色座標與發光效率的衰減率有所改善。 3.本發明之有機電激發光元件中，電洞阻擋層可將電洞侷限於發光層中，使得電洞和電子於發光層内結合的機率大幅提高，進而提昇元件的發光效率。雖然本發明已以一較佳實施例揭露如上，然其並非用以限定本發明，任何熟習此技藝者，在不脫離本發明之精神和範圍内，當可作各種之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。1019 ~ ._ 560226 5. Description of the invention (9) The light-emitting layer improves the brightness and luminous efficiency of the device. 2. In the organic electroluminescent device of the present invention, the organic electroluminescent device is doped with a hole-conducting material and an organic material having phosphorescent properties as the light emitting layer of the organic electroluminescent device. Improved. 3. In the organic electroluminescent device of the present invention, the hole blocking layer can confine the holes to the light-emitting layer, so that the probability of combining holes and electrons in the light-emitting layer is greatly increased, thereby improving the light-emitting efficiency of the device. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and decorations without departing from the spirit and scope of the present invention. The scope of protection of the invention shall be determined by the scope of the attached patent application.

10194twf.ptd 第13頁 560226 圖式簡單說明第1圖繪示為依照本發明一較佳實施例有機電激發光元件之剖面示意圖；第2圖繪示依照本發明一較佳實施例有機電激發光元件中亮度與發光效率之關係圖；以及第3圖繪示依照本發明一較佳實施例有機電激發光元件中色座標與電壓的關係圖。10194twf.ptd Page 13 560226 Brief Description of Drawings Figure 1 shows a schematic cross-sectional view of an organic electro-excitation light element according to a preferred embodiment of the present invention; Figure 2 shows an organic electro-excitation according to a preferred embodiment of the present invention The relationship between the brightness and the luminous efficiency in the light element; and FIG. 3 is a diagram showing the relationship between the color coordinates and the voltage in the organic electro-active light element according to a preferred embodiment of the present invention.

10194twf.ptd 第14頁10194twf.ptd Page 14

Claims

560226 6. Scope of patent application 1. An organic electro-optic light-emitting element, comprising: a substrate; an anode layer disposed on the substrate; a light-emitting layer disposed on the anode layer, wherein the light-emitting layer is a doped with Hole conductive material and organic material of a phosphorescent material, and the doping concentration of the hole conductive material and the phosphorescent material is between 40% ~ 60% by weight; a hole blocking layer is disposed on the light emitting On the layer; a cathode layer disposed on the hole blocking layer. 2. The organic electro-optic light-emitting device according to item 1 of the scope of patent application, wherein the substrate is a transparent substrate. 3. The organic electro-optical light-emitting device according to item 1 of the scope of patent application, wherein the anode layer includes a plurality of strip-shaped transparent electrodes. 4. The organic electro-optic light-emitting device according to item 3 of the scope of patent application, wherein the materials of the transparent electrodes include at least one of indium tin oxide, indium zinc oxide, and zinc oxide. 5. The organic electro-optic light-emitting device according to item 1 of the scope of patent application, wherein the organic material includes a small molecule organic material. 6. The organic electro-optic light-emitting device according to item 1 of the scope of patent application, wherein the organic material comprises a high molecular organic material. 7. The organic electroluminescent device described in item 1 of the scope of patent application, wherein the organic material includes a surface complex with an Isoquinoline substituent 0 8. The organic electroluminescent device described in item 1 of the scope of patent application ,

10194twf.ptd Page 15 560226 6. Scope of patent application The hole conductive material includes at least one of materials having a triphenylamine structure such as NPB, TPD and TCTA. 9. The organic electro-optical light-emitting device according to item 1 of the scope of patent application, wherein the material of the hole blocking layer includes at least one of BCP, Balq, TAZ, and TPBI. 10. The organic electro-optical light-emitting device according to item 1 of the scope of patent application, wherein the cathode layer includes a plurality of strip-shaped metal electrodes. 1 1. The organic electro-excitation photonic element described in item 10 of the scope of patent application, wherein the material of the metal electrodes includes at least one of aluminum, calcium, and magnesium-silver alloy. 1 2. The organic electroluminescent device described in item 1 of the scope of patent application, further comprising a hole injection layer, wherein the hole injection layer is disposed between the anode layer and the light emitting layer. 1 3. The organic electro-excitation light-emitting element according to item 12 of the scope of patent application, further comprising a hole conducting layer, wherein the hole conducting layer is disposed between the hole injection layer and the light emitting layer. 14. The organic electro-optic light-emitting device according to item 13 of the scope of the patent application, wherein the material of the hole injection layer includes at least one of CuPc, m-MTDATA and other materials. 15. The organic electro-optic light-emitting element according to item 13 of the scope of the patent application, wherein the material of the hole conductive layer includes at least one of materials having a tribenzylamine structure such as NPB, TPD, and TCTA. 16. The organic electro-optical light-emitting element according to item 1 of the scope of patent application, further comprising an electron conducting layer, wherein the electron conducting layer is disposed in the hole.

10194twf.ptd Page 16 560226 6. Scope of patent application Between the barrier layer and the cathode layer. 1 7. The organic electro-optic light-emitting element according to item 16 of the scope of patent application, further comprising an electron injection layer, wherein the electron injection layer is disposed between the electron conductive layer and the cathode layer. 1 8. The organic electro-optical light-emitting device according to item 17 in the scope of the patent application, wherein the material of the electron conducting layer includes at least one of metal complexes such as A1Q, BeBq2, and heterocyclic compounds such as PBD, TAZ, TPBI . 1 9. A light-emitting layer suitable for being disposed in an organic electro-optical light-emitting element, the light-emitting layer is an organic material doped with a hole conductive material and a phosphorescent material, and the hole conductive material and the phosphorescent material are The doping concentration is between 40% and 60% by weight. 20. The light-emitting layer according to item 19 of the scope of patent application, wherein the organic material includes a small molecule organic material. 2 1. The light-emitting layer according to item 19 of the scope of patent application, wherein the organic material comprises a high molecular organic material. 2 2. The light-emitting layer according to item 19 of the scope of the patent application, wherein the organic material includes a surface complex having a substituent of Is 0 q u i η ο 1 i n e. 2 3. The light-emitting layer according to item 19 in the scope of patent application, wherein the hole-conducting material includes at least one of materials having a triphenylamine structure, such as NPB, TPD, and TCTA. 2 4. The light-emitting layer according to item 19 of the scope of patent application, wherein the material of the hole blocking layer includes at least one of BCP, Balq, TAZ and TPBI

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