1299962 16846twf.doc/g 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種發光元件，且特別是有關於一種 有機電致發光元件。 【先前技術】1299962 16846twf.doc/g IX. Description of the Invention: TECHNICAL FIELD The present invention relates to a light-emitting element, and more particularly to an organic electroluminescence element. [Prior Art]
有機電致發光元件（organic electro-luminescent device，OELD )係一種利用有機官能性材料（〇rganic functional material )的自發光特性來達到顯示效果的元 件，其中依照有機官能性材料的分子量分為小分子有機電 致發光元件（Small Molecule OELD，SM-OELD)與高分子 電激發光元件（Polymer Electr(>Luminescent Device， PELD)兩大類。兩者之發光結構皆是由一對電極以及有機 官能層所構成，而有關於習知有機電致發光元件的結構將 詳述如後。 圖1繪示習知有機電致發光元件的結構示意圖。請參 考圖1，習知有機電致發光元件包括一基板11〇、一陽 極層120、一有機官能層130以及一陰極層140，其中陽極 置：基板110上’而此陽極層120之材質為銦錫 乳化物（mdlumtin〇xide，IT〇)。有機官能層13〇配 且此有機官能層130通常為數層有機薄膜 ，成外，陰極層140係配置於有機官能層13〇上， 而陰極層140之材質通常是金屬。 層===1，極層⑽人有機官能 、子赠極層14G注入有機官能層⑽，因為外 5 1299962 16846twf.doc/g 加電场所造成的電位差，使得電洞與電子兩種載子 機“層m巾祕並產^射性結合 (radiative recombination )。部分由電子電洞再結合所放 出Ϊ能量Ϊ將有機發光材料分子激發形成單—激態分子。 =單了激態分子釋放能量_基_，其中—定比例的能 里會以光子的方式放出而發光，此即為習知有機電致發光 元件100的發光原理。 然而，習知有機電致發光元件100所存在的問題是， 有機官能層130所發出的光容易因為元件内之各層的折射 率的不同而產生反射或是折射。因此，有機官能層13〇所 發出的光大部分都被限制於元件内部而無法穿透出基板 110，因而使得有機電致發光元件1〇〇的發光效率偏低。此 外，習知有機電致發光元件1〇〇通常只能單面發光而無法 提供雙面發光的功能。 ^ 【發明内容】 有鐾於此，本發明的目的就是在提供一種有機電致發 光元件，以提供雙面發光的功能。 基於上述目的或其他目的，本發明提出一種有機電致 發光元件，其包括一透明基板、多個有機電致發光單元與 一反射電極層，其中這些有機電致發光單元堆疊於透明基 板上，而反射電極層係配置於相鄰的二有機電致發光單元 之間。 依照本發明實施例，反射電極層的材質可以是銘、 舞、鎮、姻、錫、猛、銀、金及其合金。 6 1299962 16846twf.doc/g 依照本發明實施例，有機電致發光元件更包括一第一 型摻雜層與一第二型摻雜層，而反射電極層配置於第一型 摻雜層與第二型摻雜層之間。 依照本發明實施例，各個有機電致發光單元包括一陽 極層、一陰極層與配置於陽極層以及陰極層之間之一有機 官能層。An organic electro-luminescent device (OELD) is an element that utilizes the self-luminous properties of a 官能rganic functional material to achieve a display effect, wherein the molecular weight of the organic functional material is divided into small molecules. Organic electroluminescent elements (Small Molecule OELD, SM-OELD) and polymer electroluminescent elements (Polymer Electr (> Luminescent Device, PELD). Both of them have a pair of electrodes and an organic functional layer. The structure of the conventional organic electroluminescent device will be described in detail later. Figure 1 is a schematic view showing the structure of a conventional organic electroluminescent device. Referring to Figure 1, the conventional organic electroluminescent device includes a The substrate 11A, an anode layer 120, an organic functional layer 130, and a cathode layer 140, wherein the anode is disposed on the substrate 110, and the anode layer 120 is made of indium tin emulsion (mdlumtin〇xide, IT〇). The functional layer 13 is compounded and the organic functional layer 130 is usually a plurality of organic thin films, and the cathode layer 140 is disposed on the organic functional layer 13〇, and the cathode layer 140 is disposed on the organic functional layer 13〇. The material of the layer 140 is usually metal. Layer ===1, the polar layer (10) human organic function, the sub-grain layer 14G is injected into the organic functional layer (10), because of the potential difference caused by the external 5 1299962 16846twf.doc/g power-on, making electricity The hole and the electron two kinds of carrier "layer re-bination" (radiative recombination). Part of the electron beam recombination releases the enthalpy energy to excite the organic luminescent material molecules to form a single-excited molecule. The excimer molecule releases energy _base_, wherein - the proportional energy is emitted in the form of photons, which is the principle of illuminating the conventional organic electroluminescent element 100. However, conventional organic electroluminescence A problem with the element 100 is that the light emitted by the organic functional layer 130 is easily reflected or refracted by the refractive index of the layers in the element. Therefore, most of the light emitted by the organic functional layer 13 is limited to The inside of the element cannot penetrate the substrate 110, thereby making the luminous efficiency of the organic electroluminescent element 1 偏 low. Moreover, the conventional organic electroluminescent element 1 〇〇 usually only emits light on one side without The present invention provides a function of double-sided illumination. ^ SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an organic electroluminescent device that provides the function of double-sided illumination. Based on the above objects or other objects, the present invention proposes An organic electroluminescent device comprising a transparent substrate, a plurality of organic electroluminescent units and a reflective electrode layer, wherein the organic electroluminescent units are stacked on a transparent substrate, and the reflective electrode layers are disposed on adjacent ones Between organic electroluminescent units. According to an embodiment of the invention, the material of the reflective electrode layer may be Ming, Dance, Zhen, Xi, Tin, Meng, Silver, Gold and alloys thereof. 6 1299962 16846 twf.doc / g According to an embodiment of the invention, the organic electroluminescent device further includes a first type doped layer and a second type doped layer, and the reflective electrode layer is disposed on the first type doped layer and Between the two types of doped layers. According to an embodiment of the invention, each of the organic electroluminescent units comprises an anode layer, a cathode layer and an organic functional layer disposed between the anode layer and the cathode layer.
依照本發明實施例，最靠近基板表面之有機電致發光 單元包括一陽極層與一有機官能層，其中陽極層係配置於 基板上。有機官能層係配置於陽極層上，且位於此有機電 致發光單元之有機官能層上的反射電極層係作為一陰極 層。此外，陽極層為一透明導體層，而此透明導體層之材 質可以是銦錫氧化物（indium tin oxide，ITO)、銦鋅氧化 物（indium zinc oxide，IZO )或鋁鋅氧化物（alumi_ * oxide, AZO ) 〇 ，照本發明實施例，最遠離透明基板表面之有機電致 ^光單元包括-陰極層與-有機官能層。有機官能層係配 置於陰極狀底下’祕於此有機電致發光單元之有機官 能層底下之反射電極層係作為—陽極層。此外，陰極 材質可以是銘、鈣、鎮、銦、锡、錳、銀、金或其合：。 另外，陰極層也可以是-透料體層，其巾透 材質:===，__化物… 發光:=:2 恶1 S月匕層’其中陽極層係配 置於基板上。有機官能層係配置於陽極層上，且位於此有 7In accordance with an embodiment of the invention, the organic electroluminescent unit closest to the surface of the substrate comprises an anode layer and an organic functional layer, wherein the anode layer is disposed on the substrate. The organic functional layer is disposed on the anode layer, and the reflective electrode layer on the organic functional layer of the organic electroluminescent unit serves as a cathode layer. In addition, the anode layer is a transparent conductor layer, and the material of the transparent conductor layer may be indium tin oxide (ITO), indium zinc oxide (IZO) or aluminum zinc oxide (alumi_*). Oxide, AZO) According to an embodiment of the invention, the organic electro-optic unit farthest from the surface of the transparent substrate comprises a cathode layer and an organic functional layer. The organic functional layer is disposed under the cathode. The reflective electrode layer under the organic functional layer of the organic electroluminescent unit serves as an anode layer. In addition, the cathode material may be Ming, Calcium, Zhen, Indium, Tin, Manganese, Silver, Gold or a combination thereof. Alternatively, the cathode layer may be a permeate layer having a material of the following: ===, __ compound... luminescence: =: 2 11 S 匕 匕 layer' wherein the anode layer is disposed on the substrate. The organic functional layer is disposed on the anode layer and is located here.
1299962 16846twf.doc/g :致單元之有機官能層上的反射電極層係作為-陰 s匕外，最遠離透明基板表面之有機電致發光單; I:陰，層與—有機官能層，其中有機官能層係配置於ί 下而位於此有機電致發光單元之有機官能層i 下之反射包極層係作為一陽極層。 依照本發明實施例，透明基板可以是玻璃基板、塑膠 基板或可撓曲基板（flexible substrate)。 少 又基7上述，本發明採用反射電極層連接兩相鄰有機電 致發光單元或是兩相鄰有機官能層，以便於自雙面發出不 同顏色的光，因此本發明之有機電致發光元件能夠^供雙 面顯示的功能。 又 ▲為瓖本發明之上述和其他目的、特徵和優點能更明顯 易懂，下文特舉較佳實施例，並配合所附圖式，作詳細說 明如下。 ° 【實施方式】 【第一實施例】 圖2繪示依照本發明第一實施例之有機電致發光元件 的剖面示意圖。請參考圖2，本實施例之有機電致發光元 件200包括一透明基板21〇、多個有機電致發光單元22〇a、 220b與一反射電極層230，其中這些有機電致發光單元 220a與220b係堆疊於透明基板210上，而反射電極層230 係配置於這些有機電致發光單元220a與220b之間。此外， 透明基板210例如是玻璃基板、石英基板、塑膠基板或可 撓曲基板。在本實施例中，有機電致發光元件200更包括 8 1299962 16846twf.doc/g 一第一型摻雜層232與一第二型摻雜層234，而反射電極 層230配置於第—型摻雜層232與第二型摻雜層之 3 °舉例而吕’第一型摻雜層232可以是n型推雜層，而 第二型摻雜層234可以是p型摻雜層。 更詳細而言，有機電致發光單元22〇a包括一陽極層 222a、一陰極層22如與配置於陽極層222a以及陰極層226a 之間之-有機官能層224a。此外’有機官能層224a除了 包括了主要的有機發光層之外，更可依據各元件實際所需 而另外包括電齡人層、電洞傳輸層、電子傳輸層與電子 〉主入層或是其組合層。 同樣地，有機電致發光單元22%包括一陽極層2勝 一陰極層226b與配置於陽極層222b以及陰極層鳩之間 之-有機官能層224b。此外，有機官能層224b盘有機官 能層224a的結構她，同樣的有機官能層22仙除了包括 有機發光層之外，更可依據各元件實際所需而另 人層、電洞傳輸層、電子傳輸層與電子注人 屬或疋其組合層。 陽極層222a與通可以是透明或半透明。此外，陽 θ =22a與222b可以是-透明導體層，而此透明導體層 材質例如是銦錫氧化物、銦鋅氧化 】 ，透明之金屬氧化物。當陽極層222a之材 ^、_氧化物、紹鋅氧化物或其他透明之金屬氧化=匕 ^成陽極層222a的方法可以是賤鑛製程或蒸錢製程。另 ’陰極層226a與226b也可以是透明或半透明；^而陰極 1299962 16846twf.doc/g 層226a與226b之材質可以是鋁、鈣、鎂、銦、锡、猛、 銀、金或其合金，其中含鎂之合金例如是鎂銀（Mg·八^) 合金、鎂銦（Mg:In)合金、鎮錫（Mg:Sn)合金、鎂銻（Mg.sb) 合金或鎂碲（Mg:Te)合金。 請繼續參考圖2，反射電極層230可以採用蒸鑛的方 式形成，其中反射電極層230可以是鋁或是其他金屬材 質，而反射電極層230厚度可以是1000埃或是其他厚度而 能夠遮光的。由於反射電極層23〇不僅作為連接兩有機電 致發光單元220a與220b的連接層（interc〇nnecting layer)，更使得兩有機電致發光單元22加與22〇15所發出 的光線能夠分別由有機電致發光元件2〇〇之兩相對表面出 射。換§之，本貫施例之有機電致發光元件2〇〇能夠發出 兩種不同顏色的光，以便於達到雙面顯示的功能。 值知庄思的是，本實施例之有機電致發光元件2⑻並 不限定只有兩個有機電致發光單元22〇a與22〇b，更可具 有兩個以上的有機電致發光單元。此外，在這些有機電致 發光單元之有機官能層的材質也可以是相同或是不相同。 換言之，這些有機電致發光單元所發出的光線可以是同_ 種顏色或是不同顏色。 【弟二實施例】 圖^緣示依照本發明第二實施例之有機電致發光元件 的剖面不意圖。請參考圖3，第二實施例與第一實施例相 似’其不同之處在於··在本實施例之有機電致發光元件3〇〇 中，反射電極層230作為一共用電極層。換言之，反射電1299962 16846twf.doc/g: The reflective electrode layer on the organic functional layer of the unit is an organic electroluminescent single that is farthest from the surface of the transparent substrate, except for the negative cathode; I: an anion, a layer and an organic functional layer, wherein The organic functional layer is disposed under ί and the reflective cladding layer under the organic functional layer i of the organic electroluminescent unit serves as an anode layer. According to an embodiment of the invention, the transparent substrate may be a glass substrate, a plastic substrate or a flexible substrate. In addition, the present invention uses a reflective electrode layer to connect two adjacent organic electroluminescent units or two adjacent organic functional layers to facilitate emitting different colors of light from both sides, and thus the organic electroluminescent element of the present invention. Ability to ^ for double-sided display. The above and other objects, features, and advantages of the present invention will become more apparent from the description of the appended claims appended claims [First Embodiment] Fig. 2 is a cross-sectional view showing an organic electroluminescent device according to a first embodiment of the present invention. Referring to FIG. 2, the organic electroluminescent device 200 of the present embodiment includes a transparent substrate 21, a plurality of organic electroluminescent units 22A, 220b and a reflective electrode layer 230, wherein the organic electroluminescent units 220a and The 220b is stacked on the transparent substrate 210, and the reflective electrode layer 230 is disposed between the organic electroluminescent units 220a and 220b. Further, the transparent substrate 210 is, for example, a glass substrate, a quartz substrate, a plastic substrate or a flexible substrate. In this embodiment, the organic electroluminescent device 200 further includes 8 1299962 16846 twf.doc/g a first type doping layer 232 and a second type doping layer 234, and the reflective electrode layer 230 is disposed in the first type doping layer. The hetero-layer 232 and the second-type doped layer are exemplified by the LV's first-type doped layer 232, which may be an n-type doped layer, and the second-type doped layer 234 may be a p-type doped layer. In more detail, the organic electroluminescent unit 22A includes an anode layer 222a, a cathode layer 22 such as an organic functional layer 224a disposed between the anode layer 222a and the cathode layer 226a. In addition, the organic functional layer 224a may include, in addition to the main organic light-emitting layer, an electric age layer, a hole transport layer, an electron transport layer and an electron, a main entry layer, or Combination layer. Similarly, the organic electroluminescent unit 22% includes an anode layer 2, a cathode layer 226b, and an organic functional layer 224b disposed between the anode layer 222b and the cathode layer. In addition, the structure of the organic functional layer 224b of the organic functional layer 224b, the same organic functional layer 22, in addition to the organic light-emitting layer, can be further divided according to the actual needs of each element, another layer, hole transport layer, electron transport The layer is combined with an electronic person or a combination thereof. The anode layer 222a and the pass may be transparent or translucent. Further, the positive θ = 22a and 222b may be a transparent conductor layer, and the transparent conductor layer is made of, for example, indium tin oxide, indium zinc oxide, and a transparent metal oxide. The method of oxidizing the anode layer 222a, the oxide, the zinc oxide or other transparent metal to form the anode layer 222a may be a tantalum process or a steaming process. The other 'cathode layers 226a and 226b may also be transparent or translucent; and the material of the cathode 1299962 16846 twf.doc/g layers 226a and 226b may be aluminum, calcium, magnesium, indium, tin, fierce, silver, gold or alloys thereof. The magnesium-containing alloy is, for example, a magnesium-silver (Mg·8) alloy, a magnesium indium (Mg:In) alloy, a tin (Sg) alloy, a magnesium (Mg.sb) alloy or a magnesium crucible (Mg: Te) alloy. Referring to FIG. 2, the reflective electrode layer 230 may be formed by steaming, wherein the reflective electrode layer 230 may be aluminum or other metal materials, and the reflective electrode layer 230 may have a thickness of 1000 angstroms or other thickness and can be shielded from light. . Since the reflective electrode layer 23 is not only used as an interc〇nnecting layer for connecting the two organic electroluminescent units 220a and 220b, the light emitted by the two organic electroluminescent units 22 and 22〇15 can be respectively The opposite surfaces of the electroluminescent element 2 are emitted. In other words, the organic electroluminescent element 2 of the present embodiment can emit light of two different colors in order to achieve the function of double-sided display. It is known that the organic electroluminescent element 2 (8) of the present embodiment is not limited to only two organic electroluminescent units 22a and 22b, and more preferably has two or more organic electroluminescent units. Further, the materials of the organic functional layers of these organic electroluminescent units may be the same or different. In other words, the light emitted by these organic electroluminescent units can be the same color or different colors. [Second Embodiment] Fig. 4 is a schematic cross-sectional view showing an organic electroluminescent device according to a second embodiment of the present invention. Referring to Fig. 3, the second embodiment is similar to the first embodiment. The difference is that in the organic electroluminescent device 3A of the present embodiment, the reflective electrode layer 230 serves as a common electrode layer. In other words, reflected electricity
1299962 16846twf.doc/g 極f 230配置於相鄰的二有機官能層22知與2施之間。 值提的是，由於反射電極層23G可以採用蒸鑛的方式 形成，因此在形成反射電極層23G的過程 能層224a造成損傷。 ^ 更詳細而言，反射電極層23〇、有機官能層224&與透 明陽極層222a係構成一有機電致發光單元31〇a，因此反 射電極層230是作為有機電致發光單元31〇a的陰極層。同 樣地，反射電極層230、有機官能層224b與陰極層226b 係構成另-有機電致發光單元3·，因此反射電極層23〇 又同時作為有機電致發光單元310b的陽極層。 有機g能層224a包括電洞注入層2422a、電洞傳輸 層2422b、有機發光層2422c、電子傳輸層2422d與電子注 入層2422e，而有機官能層224b包括電洞注入層2424a、 電洞傳輸層2424b、有機發光層2424c、電子傳輸層2424d 與迅子注入層2424e。此外，電洞注入層2422a的材質可 以是銅苯二甲藍素（copper phthalocyanine，CuPc)，而電 洞注入層2422a的厚度約為150埃。電洞傳輸層2422b與 2424b 的材貝可以疋npb (α-naphylhenyldiamine)，而電 洞傳輸層2422b與2424b的厚度分別約為700埃與600埃。 有機發光層2422c的材質可以是MADN與摻雜物 DSA-Ph，而DSA-Ph對MADN的體積比約為3%，且有機 發光層2422c的厚度約為400埃。此外，有機發光層2424c 的材質可以是Alq3與摻雜物RU，而RU對Alq3的體積比 約為4°/〇，且有機發光層2424c的厚度約為375埃。 1299962 16846twf.doc/g 電子傳輸層2422d與2424d的材質可以是Alq3,而電 子傳輸層2422d與2424d的厚度分別約為1〇〇埃與375埃。 此外，電子注入層2422e的材質可以是Mg與Alq3，而1299962 16846 twf.doc / g The pole f 230 is disposed between the adjacent two organic functional layers 22 and 2 . It is to be noted that since the reflective electrode layer 23G can be formed by vapor deposition, the process layer 224a forming the reflective electrode layer 23G is damaged. In more detail, the reflective electrode layer 23, the organic functional layer 224 & and the transparent anode layer 222a constitute an organic electroluminescent unit 31A, and thus the reflective electrode layer 230 is used as the organic electroluminescent unit 31A. Cathode layer. Similarly, the reflective electrode layer 230, the organic functional layer 224b, and the cathode layer 226b constitute the other-organic electroluminescent unit 3·, and thus the reflective electrode layer 23 is simultaneously used as the anode layer of the organic electroluminescent unit 310b. The organic energy layer 224a includes a hole injection layer 2422a, a hole transport layer 2422b, an organic light-emitting layer 2422c, an electron transport layer 2422d, and an electron injection layer 2422e, and the organic functional layer 224b includes a hole injection layer 2424a and a hole transport layer 2424b. The organic light-emitting layer 2424c, the electron transport layer 2424d, and the spin-injection layer 2424e. Further, the material of the hole injection layer 2422a may be copper phthalocyanine (CuPc), and the thickness of the hole injection layer 2422a is about 150 angstroms. The holes of the hole transport layers 2422b and 2424b may be npb (α-naphylhenyldiamine), and the thickness of the hole transport layers 2422b and 2424b are about 700 angstroms and 600 angstroms, respectively. The material of the organic light-emitting layer 2422c may be MADN and dopant DSA-Ph, and the volume ratio of DSA-Ph to MADN is about 3%, and the thickness of the organic light-emitting layer 2422c is about 400 angstroms. Further, the material of the organic light-emitting layer 2424c may be Alq3 and the dopant RU, and the volume ratio of RU to Alq3 is about 4°/〇, and the thickness of the organic light-emitting layer 2424c is about 375 Å. 1299962 16846twf.doc/g The electron transport layers 2422d and 2424d may be made of Alq3, and the electron transport layers 2422d and 2424d have a thickness of about 1 Å and 375 Å, respectively. In addition, the material of the electron injection layer 2422e may be Mg and Alq3, and
Mg對Alq3的體積比約為1 :丨，且電子注入層2422e的厚 度約為1〇〇埃。另外，電子注入層2424e的材質可以是 WO;與NPB，而WO3對NPB的體積比約為3 :丨，且電子 /主入層2424e的厚度約為2〇〇埃。再者，陰極層226b的厚 度約為400埃。在本實施例中，第一型摻雜層232可以是 η型摻雜層，而第二型摻雜層234可以是p型摻雜層。 /在上述之第一實施例與第二實施例中，在陽極層222a 之後所心成之各膜層皆以相同（例如蒸鑛）製程形成，因 ^本么明不僅可以脑製程時間之外，更可連續形成陽極 層222a之後的各膜層。 ^情示依照本發明第二實施例之有機紐發光元件 朵強I特5圖。5月*考圖4 ’橫座標為波長，而縱座標發 由圖4可知，本實施例之有機電致發光元件300 2別為486奈米與628奈米，因此本發明能夠 又面顯不不同賢訊0 極層2μ本發明之有機電致發光元件係採用反射電 鄰;機: :f f兩相鄰有機電致發光單元、兩相 層。相較二有機電致發光單元與有機官能 面顯示 本發明之有機電致發光元件具有雙面顯示的功;：： 1299962 16846twf.doc/g 發明之有機電致發光元件也可以用於雙面顯示的手機、雙 面電視或雙面螢幕中。 & 雖然本發明已以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，當可作些許之更動與潤飾，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。 【圖式簡單說明】 圖1繪示習知有機電致發光元件的結構示意圖。 圖2繪示依照本發明第一實施例之有機電致發光元件 的剖面示意圖。 圖3繪示依照本發明第二實施例之有機電致發光元件 的剔面示意圖。 圖4繪示依照本發明第二實施例之有機電致發光元件 的光譜圖。 【主要元件符號說明】 100:習知有機電致發光元件 110 ·基板 120 :陽極層 130 :有機官能層 140 :陰極層 200、300 :有機電致發光元件 210 :透明基板 220a、220b、310a、310b ·有機電致發光單元 222a、222b :陽極層 13 1299962 16846twf.doc/g 224a、224b ··有機官能層 226a、226b ··陰極層 230 :反射電極層 232 :第一型摻雜層 234 :第二型摻雜層 2422a :電洞注入層 2422b、2424b :電洞傳輸層 2422c、2424c :有機發光層 2422d、2424d :電子傳輸層 2422e、2424e :電子注入層The volume ratio of Mg to Alq3 is about 1: 丨, and the thickness of the electron injecting layer 2422e is about 1 〇〇. Further, the material of the electron injecting layer 2424e may be WO; and NPB, and the volume ratio of WO3 to NPB is about 3: 丨, and the thickness of the electron/main layer 2424e is about 2 Å. Further, the cathode layer 226b has a thickness of about 400 angstroms. In this embodiment, the first type doping layer 232 may be an n-type doping layer, and the second type doping layer 234 may be a p-type doping layer. / In the first embodiment and the second embodiment described above, each of the layers formed after the anode layer 222a is formed by the same (e.g., steaming) process, because the method can not only be outside the brain processing time. Further, each film layer after the anode layer 222a can be continuously formed. The organic light-emitting element according to the second embodiment of the present invention is shown in FIG. May* test Fig. 4 'The horizontal coordinate is the wavelength, and the vertical coordinate is shown in Fig. 4. The organic electroluminescent element 300 2 of the present embodiment is 486 nm and 628 nm, so the present invention can be displayed again. Different organic 0-electrode layer 2μ The organic electroluminescent element of the invention adopts a reflective electric neighbor; machine: : ff two adjacent organic electroluminescent units, two-phase layer. The organic electroluminescent device of the present invention exhibits the work of double-sided display compared to the two organic electroluminescent unit and the organic functional surface;:: 1299962 16846 twf.doc/g The organic electroluminescent device of the invention can also be used for double-sided display Mobile phone, double-sided TV or double-sided screen. Although the present invention has been described above in terms of the preferred embodiments, it is not intended to limit the invention, and those skilled in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing the structure of a conventional organic electroluminescent device. Figure 2 is a cross-sectional view showing an organic electroluminescent device in accordance with a first embodiment of the present invention. Figure 3 is a schematic view showing the face of an organic electroluminescent device in accordance with a second embodiment of the present invention. Fig. 4 is a view showing the spectrum of an organic electroluminescence device according to a second embodiment of the present invention. [Description of Main Element Symbols] 100: Conventional Organic Electroluminescent Element 110 • Substrate 120: Anode Layer 130: Organic Functional Layer 140: Cathode Layers 200, 300: Organic Electroluminescent Element 210: Transparent Substrates 220a, 220b, 310a, 310b · Organic electroluminescent unit 222a, 222b: anode layer 13 1299962 16846twf.doc / g 224a, 224b · organic functional layer 226a, 226b · cathode layer 230: reflective electrode layer 232: first type doped layer 234: Second doped layer 2422a: hole injection layer 2422b, 2424b: hole transport layer 2422c, 2424c: organic light emitting layer 2422d, 2424d: electron transport layer 2422e, 2424e: electron injection layer
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