201041435 六、發明說明： 【發明所屬之技術領域】 本發明係關於一磕白光有機電激發光元件，特別是關 於一種用於有機電激發光顯示器之白光有機電激發光元件。 【先前技術】 目前有機電激發光元件產業所廣為使用的全彩化技術大致 分為二類.（1)紅綠藍序列式蒸鑛(RGB side by sidepattern); (2)光201041435 VI. Description of the Invention: [Technical Field] The present invention relates to a white organic electroluminescent device, and more particularly to a white organic electroluminescent device for an organic electroluminescent display. [Prior Art] At present, the full-color technology widely used in the organic electroluminescent device industry is roughly classified into two categories: (1) RGB side by side pattern; (2) light
色轉換(color conversion) ; (3)白光有機電激發光元件加上彩色濾 光片。其中，紅綠藍序列式蒸鑛適用於蒸鍍製程之小分子元件。 至於光色轉換技術，則需先經光色轉換層。 雖然白光有機電激發光元件技術漸趨成熟，但仍有部分技 術瓶頸亟需克服。其中，元件複雜度為一議題，其需在發光層中 摻雜複數個發光摻雜物，或者藉由主體至摻雜物之能量不完全轉 移，使主體跟摻雜物同時發光而組成白光。 因此，一種用於全彩化技術之具有較大工作範圍的白光 電激發光元件，便為此業界所亟需。Color conversion; (3) White organic electroluminescent element plus color filter. Among them, the red, green and blue sequential steaming is suitable for the small molecular components of the evaporation process. As for the light color conversion technology, it is necessary to pass through the light color conversion layer. Although the technology of white organic light-emitting elements has gradually matured, there are still some technical bottlenecks that need to be overcome. Among them, the complexity of the component is an issue, which requires doping a plurality of luminescent dopants in the luminescent layer, or incompletely shifting the energy of the host to the dopant, so that the body and the dopant simultaneously emit light to form white light. Therefore, a white light-emitting element having a large working range for full-coloring technology is urgently needed for the industry.
【發明内容】 本發明之一目的在提供一種白光有機電激發光元件。此 有，電激發光元件包含—陽極、—陰極、—覆蓋層和—有機層。 覆蓋層位於陰極之上’有機層餘該陽滅該陰關。有機層包 含一藍光發光層，且有機層之厚度為χ+12〇Ν奈米，^ 855X^125，且Ν=〇、1 或 2。 /、甲 本發明f另一目的在提供一種有機電激發光顯示器。此有機 電激發光齡n包含-如前所狀自光有機電激發光元件和—彩 色濾光片。其中，白光有機電激發光元件係用以發射一白光，^ 5 201041435 色濾光片係用以轉換該白光為一第一色光，且該第一色光為一紅 光、一藍光或一綠光。 本發明僅藉由調整白光有機電激發光元件中的發光層厚 度，便可得到發射一白光之白光有機電激發光元件，具有增 大全彩化製程之工作範圍之優點。 在參閱圖式及隨後描述之實施方式後，本發明所屬技術領域 中具有通常知識者便可瞭解本發明之其他目的，以及本發明之技 術手段及實施態樣。 【實施方式】 本發明之第一實施例係為一種白光有機電激發光元件丨，如第 1圖所示。此白光有機電激發光元件1包含一陽極U、一陰極13、 一覆蓋層15、一電子注入層17、一電洞注入層19和一有機層12。 覆蓋層15位於陰極13之上，電子注入層17、電洞注入層19和有 機層12皆位於陽極11與陰極13間，且有機層12係位於電子注 入層Π和電洞注入層19之間。有機層12包含一藍光發光層121、 位於藍光發光層121及陰極13之間的一電子傳輸層123以及位於 藍光發光層121以及陽極11之間的一電洞傳輸層125。 於本發明白光有機電激發光元件1中，陽極11係位於一基板 ^L’除作為電極外，更提供反射光線之功能。因此，陽極^較 佳係由選自以下群組之不透明且具反射性之物料所提供： 紹、紹敍合金、鉬及鉻等。 為雷ΪίίΓ機電激發光元件1 +，來自發光層的光線將經由作 if，陰極13發射而出。因此，陰極13需具—定的穿透声。 ’陰極13較佳係由選自以下群組之半透明物料所g又 該金屬氧=及i組(但不以此為限)， 々％巧镑銦、錫、猛、銀、金、鎂合金、鎂錫合 201041435 金、鎂銻合金、鎂碲合金、鎂銀合金、鎂銦合金、鋁鋰合金等； 透明金屬氧化物可為姻錫氧化物合金(indium tin oxide alloy， ITO)、氧化銦-氧化鋅合金(indium oxide-zinc oxide alloy， In2〇3_ZnO)、氧化辞等。一般而言，於可採用之厚度範圍内，較佳 係採用較薄之膜層以提供陰極13。舉例言之，當陰極13選用銀且 其可行之厚度為15奈米至20奈米時，較佳係採用15奈米。 ΟSUMMARY OF THE INVENTION One object of the present invention is to provide a white organic electroluminescent device. Thus, the electroluminescent element comprises an anode, a cathode, a cover layer and an organic layer. The cover layer is above the cathode. The organic layer remains annihilated. The organic layer contains a blue light-emitting layer, and the thickness of the organic layer is χ+12〇ΝN, ^855X^125, and Ν=〇, 1 or 2. /, A Another object of the present invention is to provide an organic electroluminescent display. The organic electroluminescence age n includes - as before, the self-optical organic electroluminescent element and the color filter. Wherein, the white organic electroluminescent device is configured to emit a white light, and the color filter is used to convert the white light into a first color light, and the first color light is a red light, a blue light or a Green light. The invention can obtain the white light organic electroluminescent optical element emitting white light only by adjusting the thickness of the light emitting layer in the white organic electroluminescent device, which has the advantages of increasing the working range of the full coloring process. Other objects of the present invention, as well as the technical means and embodiments of the present invention, will be apparent to those of ordinary skill in the art. [Embodiment] A first embodiment of the present invention is a white organic electroluminescent device 丨, as shown in Fig. 1. The white organic electroluminescent device 1 comprises an anode U, a cathode 13, a cover layer 15, an electron injection layer 17, a hole injection layer 19 and an organic layer 12. The cover layer 15 is located above the cathode 13. The electron injection layer 17, the hole injection layer 19 and the organic layer 12 are located between the anode 11 and the cathode 13, and the organic layer 12 is located between the electron injection layer 电 and the hole injection layer 19. . The organic layer 12 includes a blue light emitting layer 121, an electron transport layer 123 between the blue light emitting layer 121 and the cathode 13, and a hole transport layer 125 between the blue light emitting layer 121 and the anode 11. In the white organic electroluminescent device 1 of the present invention, the anode 11 is located on a substrate ^L' in addition to the electrode, and further provides a function of reflecting light. Therefore, the anode is preferably provided by an opaque and reflective material selected from the group consisting of: Shao, Shaoxu alloy, molybdenum and chromium. For the Thunder ί Γ electromechanical excitation element 1 +, light from the luminescent layer will be emitted as if, cathode 13. Therefore, the cathode 13 needs to have a predetermined penetration sound. The cathode 13 is preferably made of a translucent material selected from the group consisting of metal oxygen = and i groups (but not limited thereto), 々% 巧, pounds of indium, tin, fierce, silver, gold, magnesium. Alloy, magnesium tin 201041435 gold, magnesium bismuth alloy, magnesium bismuth alloy, magnesium silver alloy, magnesium indium alloy, aluminum lithium alloy, etc.; transparent metal oxide can be indium tin oxide alloy (ITO), oxidation Indium oxide-zinc oxide alloy (In2〇3_ZnO), oxidation word, and the like. In general, it is preferred to use a thinner film layer to provide the cathode 13 within the thickness range that can be employed. For example, when the cathode 13 is made of silver and its usable thickness is from 15 nm to 20 nm, it is preferred to use 15 nm. Ο
G 位於白光有機電激發光元件1最上方之覆蓋層15，係用以增 加元件中發光層上方之穿透度。較佳地，係採用折射率較陰極^ 料折射率為高之物料以提供覆蓋層15，從而導出較多光線。舉例 言之（但不以此為限），可採用選自以下群組之物料以提供覆蓋層 15 ·參-(8-經基喧琳)|g(Tris(8-hydroxyquinoline)aluminum，Alq3)、 氧化鋅銦(zinc-tin oxide，ZTO)、氧化錫(tin-oxide，SnOx)、氧化銦 (indium oxide，InOx)、氧化銦(molybdmim oxide，MoOx)、氧化碌 itellurium oxide’ TeOx)、氧化録(antimony oxide，SbOx)、氧化鋅(zinc oxide, ZnOx)、硒化鋅(zinc selenide，ZnSe)、及碲化鋅(zinc tellurium，G is a cover layer 15 located at the uppermost portion of the white organic electroluminescent element 1 for increasing the transmittance above the luminescent layer in the element. Preferably, a material having a refractive index higher than that of the cathode is used to provide the cover layer 15 to derive more light. For example (but not limited thereto), materials selected from the group consisting of the following groups may be used to provide a cover layer 15 - (8-viaquinoline) aluminum, Alq3 , zinc-tin oxide (ZTO), tin-oxide (SnOx), indium oxide (InOx), indium oxide (molybdmim oxide, MoOx), oxidized itellurium oxide 'TeOx), oxidation (antimony oxide, SbOx), zinc oxide (ZnOx), zinc selenide (ZnSe), and zinc tellurium (zinc tellurium)
ZnTe)。較佳地’係採用選自以下群組之物料以提供覆蓋層i5 :參 -(8-羥基喹啉)鋁、二氧化錫(Sn〇2)、二氧化碲(Te〇2)、硒化辞 (ZnSe)、及碲化鋅(ZnTe)。其中，當選用二氧化錫以提供覆蓋層15 時，較佳係採用厚度10奈米至20奈米，更佳為15奈米。 電子注入層（EIL) 17位於陰極13與有機層丨2之間，以促進 電子自陰極13注人有機層12中。電子注人層17可採用選自以下 群組之物料··驗金屬、驗土金屬、及其組合。舉例而之（但不以 此為限）’驗金屬可為經、納、鉀、麵、絶；驗土金屬可為鎮、約、 二其，子it入層17選用解’其厚度較佳為1奈米 光元件丁丫中1米。需說明者’於本發明白光有機電激發 ^件^ 層17乃可視需要選用之物料層，並非必需。 子、U 2所，係本發明之一實施態樣，於實際應用時，電 子注入層17未必存在。 叮电 201041435 強自19位於陽極11與有機層12之間，用以加 有機層12之電洞注人。舉例而之（但不以此為限）， =以&供電耻人層19之材料包括：氟化聚合物(CFx)，其中 於0且小於等於2;銅笨二甲藍(e()ppei>___&， 7 f J，4’，4,K叫萘基>N笨基-氨基 > 三苯氨ZnTe). Preferably, a material selected from the group consisting of the following groups is used to provide a cover layer i5: gins-(8-hydroxyquinoline)aluminum, tin dioxide (Sn〇2), cerium oxide (Te〇2), selenization Word (ZnSe), and zinc telluride (ZnTe). Among them, when tin dioxide is selected to provide the cover layer 15, it is preferably used in a thickness of 10 nm to 20 nm, more preferably 15 nm. An electron injection layer (EIL) 17 is interposed between the cathode 13 and the organic layer 丨2 to promote electrons from the cathode 13 into the organic layer 12. The electron injecting layer 17 may be selected from the group consisting of metals, soils, and combinations thereof. For example (but not limited to this) 'the metal can be the warp, nano, potassium, surface, and extinction; the soil for the soil test can be town, about, and two, and the sub-it layer 17 is selected to have a better thickness. It is 1 meter in 1 nanometer light component. It should be noted that the layer 17 of the white organic electro-inducing layer of the present invention is a material layer which can be selected as needed, and is not essential. The sub-U and U 2 are one embodiment of the present invention. In practical applications, the electron injection layer 17 does not necessarily exist. 2010 2010 201041435 Strongly 19 is located between the anode 11 and the organic layer 12, and is used to add a hole in the organic layer 12. By way of example (but not by way of limitation), the material of the power supply layer 19 includes: fluorinated polymer (CFx), where 0 and less than or equal to 2; copper stupid blue (e() Ppei>___&, 7 f J,4',4,K is naphthyl>N stupyl-amino> triphenylamine
Tris(N (2-naphthyl)-N-phenyl-amino)-triphenylamine ? 2- TNATA)等。如同電子注入層17，電洞注入層19於本發明白光 有機電激縣7G件1巾亦非必需，是故熟習此項麟者可視實際 需求省略此電洞注入層19。 ' 有機層12包含一藍光發光層12卜一位於藍光發光層121以 及陰極13之間的電子傳輸層123、以及一位於藍光發光層121以 及陽極11之間的電洞傳輸層125。其中，藍光發光層121具有一 第一厚度’視所選用之材質，其範圍在1〇至50奈米。舉例言之， 當藍光發光層121為摻雜3重量百分比之對-雙[對_n，N-二苯基-胺基-本乙稀基]本（p-bis[p-N，N-diphenyl-amino-styryl]benzene， DSA-Ph )之 2-(甲基)-9，10·雙-(2-萘基）蔥（2-methyl-9，l(Mi(2-naphthyl)anthracene ’ MADN)層時(亦即以 MADN 為基材，3% DSA-Ph為摻質），該藍光發光層121之一厚度可為30奈米。其他 亦可選用為藍光發光層121之基材之物料包含（但不以此為限）： 蒽衍生物(anthracene derivatives)、嗔二唾基衍生物(oxadiazole derivatives)，如1，3-雙[(4-第三丁基苯基)-l，3,4-噁二唑]伸苯基 (l，3-bis(4_t-butylphenyl-l，3,4-oxadizolyl)phenylene，OXD)、1，2,4- 三0坐衍生物（l，2,4-triazole derivative，TAZ)、二苯乙豨苯 (distyiylbenzene, DSB)或雙芪類衍生物（distyrylarylene derivatives，DSA)，如 4,4'-雙(2,2'-二苯基乙稀基)-1，1·-二苯基 (4,4'-bis(2,2'-diphenyl vinyl)-l，l’-biphenyl ’ DPVBi)、以及 l，4-雙 [2-(3-N_ 乙基咔唑）乙烯基]苯（UbisP-P-N-ethyl-carbazoryOvinyUbenzene ， BCzVB) 。 而可選 用為摻 質之物 料包含(但 不以此為限）：聚對二甲苯基(parylene)、（2,5-二(5-第三丁基苯基 201041435 -2-苯并喔唾基）嗔吩（(2,5-bis(5-tert-butyl-2-benzoxazolyl) 叩hene ’ BBOT)、以及N-芳基苯并咪唑， TPBI)等。 電子傳輸層123具一範圍在1〇至5〇奈米之第二厚度，視其 材料而異。舉例言之’當採用參_(8_羥基喹啉)鋁(Tris(8_hydr〇xyl'_ quindine)alUminum，Alq3)以提供電子傳輸層123時，其厚度可為 30奈米。其他亦可用以提供電子傳輸層123之物料包含（但不以 此為限）.金屬螯备号辛化合物（metal cheiated oxjn〇id compound)(亦指 8-羥基喹琳(8-quinoiinoi)或 8_羥基喹琳(8_hy(Jr〇xy_ 〇 quinoline))及丁一稀仿生物（butadienederivatives)等。 電洞傳輸層125具一範圍在40至50奈米之第三厚度，視其 ^料而異。舉例言之’當採用N，N，—二(伸萘小基州界二苯基_聯 苯胺（N，N'-di(naphthalene-1 -yO-N’Nf-diphenyl-benzidine，NPB)以提 供電洞傳輸層125時，其厚度可為45奈米。亦可選用芳族第三胺 (aromatic tertiaiy amine)以提供電洞傳輸層丨25，該芳族第三胺具 至少一與碳原子鏈結之三價氮原子，且具至少一芳香環。該芳族 第三胺可為如單芳基胺(monoaiyl amine)、二芳基胺(diaiylamine)、 二^'基胺(triarylamine)、及聚合芳基胺(polymeric gjyiamiue)之芳基 q 胺(町丨簡⑹），譬如：n，n'-二(伸萘小基)-Ν,Ν'-二苯基-聯苯胺 (N,N ~di(naphthalene-l -yl)-N,N'-diphenyl-benzidine ，NPB)、 N，N，N，N*-四萘基-聯苯胺 qsj，N，N’，N’-tetranaphthyl-benzi(!ine， TNB)、Ν,Ν1-二苯基-Ν,Ν1-雙(3-甲基苯基)-l，l’-二苯基-4,4·-二胺 (N,N -dipheny l-N,N'-bis(3-methylphenyl)-1-1 ,-biphenyl-4-4,-diamine ’ TPD)和4,4’，4”-參(3-甲基苯基苯基胺基)-三苯胺(4,4，，4"-tris (3-methylphenylphenylamino)-triphenylamine，MTDATA)等。電洞 傳輸層125亦可由聚環芳香化合物(p〇iyCyCiic咖脱此comp0und) 所提供’譬如：聚(2-乙稀基三苯胺)p〇ly(vinyltriphenylamine)，PVT) 及聚(11-乙婦味〇坐）&〇1丫(11_>^11丫1(^31^&2〇16)，卩\^)。 201041435 如第1圖之圖示說明’由藍光發光層121發出藍光14a與14b， 其中’藍光14a向上發射依序經由電子傳輸層123、電子注入層 17、陰極13及覆蓋層15而射出；藍光14b則向下發射，經由電 洞傳輸層125至電洞注入層19，由陽極11反射成光線16，光線 16再依序通過電洞注入層19、電洞傳輸層125、藍光發光層12卜 電子傳輸層123、電子注入層17、陰極13及覆蓋層15而射出。 於此，反射光線16會因穿過上述各層所形成之微共振腔 (micro-cavity)而自藍光轉變為其他顏色。 經發現，藉由調整微共振腔之深度，亦即調整有機層12總厚 度為(X+120N)奈米，其中85SXS125，且Ng〇且為整數，便可 由藍光14b反射而出黃色反射光線16’藍光14a與黃光(即光線16) 會因建設性干涉而混合成白光，從而提供白光有機電激發光元件 1。較佳地，有機層12之厚度為(X+120N)奈米，其中85SXS125， 且N=0、1或2。此即，有機層12厚度範圍較佳為：125、 205SXS245、或 325SXS365。 本發明之第二實施例係為一種有機電激發光顯示器2，如第2 圖所示。微觀而言，有機電激發光顯示器2包含三如前實施例所 述之白光有機電激發光元件21、三彩色濾光片23，以及三相應驅 動電路25。該二彩色渡光片23係各對應至該三白光有機電激發光 元件21，以分別轉換由三白光有機電激發光元件21所射出之白光 為一第一色光22、一第二色光24和一第三色光26，且該第一色 光22為一紅光、第二色光24為一藍光、第三色光％為一綠光。 三相應驅動電路25則分別控制紅光、藍光、綠光之開關，以顯示 不同色彩。 第3圖係為上述有機電激發光顯示器2之分解圖。巨觀而言， 有機電激發光顯示器2除包含上述白光有機電激發光元件21及彩 色濾光片23外’更包含顯示面基板31、暗色吸光結構33及驅動 電路元件35。顯示面基板31具有内表面311及外表面313〇暗色 201041435 ，光結構33、驅動電路元件35及白光有機電激發光 面基板31之内表面311側，而彩色濾光片23較佳則^ 成於顯不面基板31之外表面313侧。顯示面基板31之内表n 有一發光區域32及非發光區域34。由上述說明可知，本發 機電激發光元件21及彩色濾Μ 23,便可達到顯示器 全彩化，而無工作環境或使用材料之限制，並可 彩化製程、擴大製程之工作範圍。 Ο 上述之實施例僅用來例舉本發明之實施態樣，以及闡釋本發 明之技，雜，麟肖來限齡個之齡。任何縣此技術者 可輕易完成之改變或均等性之安排均屬於本發明所主張之範圍， 本發明之權利範圍應以申請專利範園為準。 【圖式簡單說明】 第1圖係為根據本發明之第一實施例之剖面示意圖； 第2圖係為根據本發明之第二實施例之剖面示意圖；以及 第3圖係為根據本發明之第二實施例之分解示意圖。 【主要元件符號說明】 Ο 1:白光有機電激發光元件 11 :陽極 12 =有機層 121 :藍光發光層 123 :電子傳輸層 125 :電洞傳輸層 13 :陰極 14a、14b :藍光 15 :覆蓋層 16 :光線 11 201041435 17 :電子注入層 19 :電洞注入層 2:有機電激發光顯示器 21 :白光有機電激發光元件 22 :第一色光 23 :彩色濾光片 24 :第二色光 25 :相應驅動電路 26 :第三色光 31 :顯示面基板 311 :内表面 313 :外表面 32 :發光區域 33 :彩色濾光片 34 :非發光區域 35 :驅動電路元件 12Tris(N (2-naphthyl)-N-phenyl-amino)-triphenylamine ? 2- TNATA) and the like. Like the electron injecting layer 17, the hole injecting layer 19 is not necessary for the 7G piece of the white light organic electromagnetism in the present invention, so that the hole injecting layer 19 can be omitted as the actual needs of the person. The organic layer 12 includes a blue light-emitting layer 12, an electron transport layer 123 between the blue light-emitting layer 121 and the cathode 13, and a hole transport layer 125 between the blue light-emitting layer 121 and the anode 11. Wherein, the blue light emitting layer 121 has a first thickness ' depending on the material selected, and ranges from 1 50 to 50 nm. For example, when the blue light-emitting layer 121 is doped with 3 wt% of p-bis [p-bis, N-diphenyl-amino-benzil] (p-bis[pN, N-diphenyl-] Amino-styryl]benzene, DSA-Ph) 2-(methyl)-9,10·bis-(2-naphthyl) onion (2-methyl-9,l(Mi(2-naphthyl)anthracene ' MADN)) When the layer is used (that is, MADN is used as the substrate and 3% DSA-Ph is used as the dopant), one of the blue light-emitting layers 121 may have a thickness of 30 nm. Other materials which may be selected as the substrate of the blue light-emitting layer 121 include (but not limited to this): anthracene derivatives, oxadiazole derivatives, such as 1,3-bis[(4-t-butylphenyl)-l,3, 4-, 2-bis(4_t-butylphenyl-l, 3,4-oxadizolyl) phenylene, OXD), 1,2,4-tri-negative derivatives (l, 2, 4 -triazole derivative, TAZ), distyiylbenzene (DSB) or disyrylarylene derivatives (DSA), such as 4,4'-bis(2,2'-diphenylethene) -1,1·-diphenyl (4,4'-bis(2,2'-diphenyl vinyl)-l,l'-biphenyl ' DPVBi), and l,4-bis[2-(3-N_ B base UbisP-PN-ethyl-carbazoryOvinyUbenzene (BCzVB). The materials that can be used as dopants include (but are not limited to): parylene, (2,5- Bis(5-tert-butylphenyl 201041435 -2-benzoxanthyl) porphin ((2,5-bis(5-tert-butyl-2-benzoxazolyl) 叩hene 'BBOT), and N-fang Benzimidazole, TPBI), etc. The electron transport layer 123 has a second thickness ranging from 1 Å to 5 Å, depending on the material. For example, when ginseng (8-hydroxyquinoline) is used Aluminum (Tris (8_hydr〇xyl'_ quindine)alUminum, Alq3) may have a thickness of 30 nm when the electron transport layer 123 is provided. Other materials may also be used to provide the electron transport layer 123 (but not limited thereto) Metal cheiated oxjn〇id compound (also referred to as 8-quinioinoi or 8-hydroxylin (8_hy(Jr〇xy_ 〇quinoline)) Biology (butadienederivatives) and so on. The hole transport layer 125 has a third thickness ranging from 40 to 50 nanometers, depending on the material. For example, when N, N, - 2 (N, N'-di(naphthalene-1 - yO-N'Nf-diphenyl-benzidine, NPB) is used When the hole transport layer 125 is provided, the thickness thereof may be 45 nm. An aromatic tertiaiy amine may also be selected to provide a hole transport layer 丨25, the aromatic third amine having at least one and a carbon atom. a trivalent nitrogen atom having at least one aromatic ring, and the aromatic third amine may be, for example, a monoaiyl amine, a diiaylamine, a triarylamine, or a triarylamine. And aryl arylamine (polymeric gjyiamiue) aryl q amine (Machi (J) (譬), such as: n, n'-di(Naphthalene)-Ν, Ν'-diphenyl-benzidine (N, N ~di(naphthalene-l -yl)-N,N'-diphenyl-benzidine ,NPB), N,N,N,N*-tetraphthyl-benzidine qsj,N,N',N'-tetranaphthyl- Benzi(!ine, TNB), Ν, Ν1-diphenyl-fluorene, Ν1-bis(3-methylphenyl)-l,l'-diphenyl-4,4·-diamine (N,N -dipheny lN,N'-bis(3-methylphenyl)-1-1 ,-biphenyl-4-4,-diamine 'TPD) and 4,4',4"-parade (3-methylphenylphenylamine) Base)-triphenylamine (4 , 4,, 4 "-tris (3-methylphenylphenylamino)-triphenylamine, MTDATA), etc. The hole transport layer 125 can also be provided by a polycyclic aromatic compound (p〇iyCyCiic coffee off this comp0und), such as: poly (2-B Phenylene triphenylamine) p〇ly (vinyltriphenylamine), PVT) and poly (11-Ethyl tartrate) &〇1丫(11_>^11丫1(^31^&2〇16),卩\ ^) 201041435 As illustrated in Fig. 1 'the blue light 14a and 14b are emitted by the blue light emitting layer 121, wherein the 'blue light 14a' is emitted upward through the electron transport layer 123, the electron injection layer 17, the cathode 13 and the cover layer 15 in this order. The blue light 14b is emitted downwardly, through the hole transport layer 125 to the hole injection layer 19, and is reflected by the anode 11 into the light 16, and the light 16 is sequentially passed through the hole injection layer 19, the hole transport layer 125, and the blue light. The layer 12 is emitted from the electron transport layer 123, the electron injection layer 17, the cathode 13, and the cover layer 15. Here, the reflected light 16 is converted from blue light to other colors by the micro-cavity formed through the above layers. It has been found that by adjusting the depth of the micro-resonant cavity, that is, adjusting the total thickness of the organic layer 12 to (X+120N) nanometer, wherein 85SXS125, and Ng〇 is an integer, the yellow reflected light 16 can be reflected by the blue light 14b. The blue light 14a and the yellow light (i.e., the light 16) are mixed into white light due to constructive interference, thereby providing the white organic electroluminescent element 1. Preferably, the organic layer 12 has a thickness of (X + 120 N) nanometers, of which 85SXS125, and N = 0, 1 or 2. That is, the thickness of the organic layer 12 is preferably in the range of 125, 205SXS245, or 325SXS365. A second embodiment of the present invention is an organic electroluminescent display 2, as shown in Fig. 2. Microscopically, the organic electroluminescent display 2 comprises three white organic electroluminescent elements 21, three color filters 23, and three corresponding driving circuits 25 as in the previous embodiments. The two color light-emitting sheets 23 are respectively corresponding to the three white organic organic light-emitting elements 21 to respectively convert the white light emitted by the three white organic organic light-emitting elements 21 into a first color light 22 and a second color light 24; And a third color light 26, wherein the first color light 22 is a red light, the second color light 24 is a blue light, and the third color light is a green light. The three corresponding driving circuits 25 respectively control the switches of red, blue, and green light to display different colors. Fig. 3 is an exploded view of the above-described organic electroluminescent display 2. In addition, the organic electroluminescent display 2 includes a display surface substrate 31, a dark light absorbing structure 33, and a driving circuit element 35 in addition to the white organic electroluminescent element 21 and the color filter 23. The display surface substrate 31 has an inner surface 311 and an outer surface 313, a dark color 201041435, a light structure 33, a driving circuit element 35, and an inner surface 311 side of the white organic electroluminescent surface substrate 31, and the color filter 23 is preferably formed. The outer surface 313 side of the substrate 31 is not shown. The inner surface n of the display surface substrate 31 has a light-emitting region 32 and a non-light-emitting region 34. It can be seen from the above description that the present electromechanical excitation light element 21 and the color filter 23 can achieve full color display, without the limitation of working environment or materials, and can color the process and expand the working range of the process. The above embodiments are only used to exemplify the embodiments of the present invention, and to explain the techniques of the present invention. Any change or equality arrangement that can be easily accomplished by any skilled person in the county is within the scope of the present invention. The scope of the invention should be based on the patent application. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic cross-sectional view of a first embodiment of the present invention; Figure 2 is a schematic cross-sectional view of a second embodiment of the present invention; and Figure 3 is a schematic view of the present invention. An exploded schematic view of the second embodiment. [Description of main component symbols] Ο 1: White organic electroluminescent element 11 : Anode 12 = Organic layer 121 : Blue light emitting layer 123 : Electron transport layer 125 : Hole transport layer 13 : Cathode 14 a , 14 b : Blue light 15 : Cover layer 16: Light 11 201041435 17 : Electron injection layer 19 : Hole injection layer 2 : Organic electroluminescence display 21 : White organic electroluminescence element 22 : First color light 23 : Color filter 24 : Second color light 25 : Corresponding driving circuit 26: third color light 31: display surface substrate 311: inner surface 313: outer surface 32: light emitting region 33: color filter 34: non-light emitting region 35: driving circuit element 12