1238021 有機發光裝置之研究開發經驗，終而有本發明之產生。 · 【發明内容】 · 本發明之主要目的在於提供—種有機發光元件，其具· 5有高發光效率及可產生偏深藍色光。 一緣以達成上述之目的，本發明所提供之一種有機發光 =件’包含有：-陽極；—陰極；—有機發光層，介於該 陽極與該陰極之間，該有機發光層係發射藍光，該有機發籲 光層包括：一第一有機發光材料；一第二有機發光材料， ⑴係為ό玄第一有機發光材料之摻雜物(d〇pant)，且該第二有機 發光材料之能隙大於該第一有機發光材料之能隙。 【實施方式】 以下，兹列舉本發明之較佳實施例，並配合下列圖示 15 詳細說明於后，其中： 第一圖係本發明一較佳實施例之結構示意圖。 籲 第二圖係本發明上述較佳實施例之能隙圖。 第三圖類同第二圖，說明第二有機發光材料之最高佔 ： 據軌道絕對值等於第一有機發光材料之最高佔據軌道絕對 2G值。 第四圖類同第二圖，說明第二有機發光材料之最高佔 據執道絕對值小於第一有機發光材料之最高佔據執道絕對 值。 第五圖類同第二圖，說明第二有機發光材料之最低空 -5- l238〇2i 軌道絕對值等於第一有機發光材料之最低空軌道絕對值。 第六圖類同第二圖，說明第二有機發光材料之最低空 軌道絕對值大於第一有機發光材料之最低空執道絕對值。 第七圖係本發明上述較佳實施例之電流密度與發光效 5率關係圖。 第八圖係本發明上述較佳實施例之CIE座標圖。 第九圖係本發明發光元件未摻雜roE1〇2材料時之能 隙圖。 第十圖類同第九圖，說明第二有機發光材料之最高佔 10據軌道絕對值等於第-有機發光材料之最高佔據執道 值。 第十一圖類同第九圖，說明第二有機發光材料之最高 佔據執道絕對值小於第—有機發光材料之最高佔據執 對值。 *第十一圖類同第九圖，說明第二有機發光材料之最低 :軌道絕對值等於第—有機發光材料之最低空執道絕對 值0 第十二圖類同第九圖，說明第二有機發光材料之最低 :軌道絕對值大於第-有機發光材料之最低空軌道絕對 機^ 、二圖所示，係本發明—較佳實施例之琴 為1結構’該有機發統件1結構自下而上依;5 為·表面設有ιτο陽極u之基板1G、電㈠ -6- 1238021 ，層30、電子傳輸層4〇、電子注入層50與陰極60， 二先呪明，本實施例中所使用之有機發光材料係以小分子 料為例’且各膜層的朗方式以蒸細彡成，以下兹就各 、層所選用的材料及其成膜厚度敘述如後，其中： X電/同傳輸層20係以三芳香基胺(triarylamij^s)材料沉 積於4 ITO陽極基板1〇 ±而製得，其厚度為_埃⑷。 該有機發光層30形成於電洞傳輸層2〇上且厚度為4〇〇 、（），在本實施例中，該有機發光層3()係由三種有機發 光材料摻雜而成，其中： 選用DSA(distyrylarylenes)材料做為第一有機發光 材料31，其介於最低空執道31a(LUMO)與最高佔據執 道31b(HOMO)之間的能隙如圖二中粗黑線框所表示； 選用CBP材料做為第二有機發光材料32，其能隙 =圖二中細虛線所表示，即超出粗黑線框範圍之虛線部 份，易言之，此情形下的第二有機發光材料32之最低 空執道32a的絕對值係小於第一有機發光材料31之最 ，空軌道31a的絕對值，且第二有機發光材料32之最 同佔據執道32b的絕對值係大於第一有機發光材料31 之最高佔據執道31b的絕對值； 選用日本出光興產所發表之IDE102材料做為第三 有機發光材料33，其能隙如圖二中粗虛線所表示，即 未起出粗黑線框範圍之虛線部份，易言之，此情形下的 第二有機發光材料33之最低空執道33a的絕對值係大 於第一有機發光材料31之最低空執道31a的絕對值， 1238021 且第二有機發光材料33之最高佔據執道33b的絕對值 係小於第一有機發光材料31之最高佔據執道31b的絕 對值； 月il述第二有機發光材料32及第三有機發光材料33 5 係均為第一有機發光材料31之摻雜物(dopant)，且第二 有機發光材料32之摻雜濃度為第一有機發光材料31 的1%至50%，尤以介於1%至3〇%之間為佳，而第三 有機發光材料33之摻雜濃度為第一有機發光材料31 的3% 〇 1〇 而该電子傳輸層40以Alcl材料沉積於有機發光層30 上而形成，其厚度為200埃(A)。 該電子注入層50以UF材料沉積於電子傳輸層4〇上 而形成，其厚度為7埃(A)。 該陰極60係以A1材料製成，其位於電子注入層5〇上 15且厚度為15〇〇埃(A)。 以上即為本發明有機發光元件1之一較佳實施例組成 說明’惟必須強調的是，各膜層的構成材料並非侷限於上 述，以該有機發光層30為例，其第一有機發光材料31尚 T 遥自 perylene 衍生物、dipyrazolopyridine 衍生物、 2〇 bis(styryl)amine衍生物或其他共輛苯環型材料之一者； 苐一有機發光材料32可選自star-burst類化合物(如： m-MTDATA、2-TNATA)、N-arylimidazoles 衍生物（如： TPBI)、triazole 衍生物(如：TAZ)、oxadiazole 衍生物(如： PBD)、triaryl amine、biphenyi amine 衍生物(如·· TCTA、 各 1238021 mCP)、1，3-butadiene e 衍生物(如：TPB)、hydroxyqUino metal complex(如：BAlq)或 phenanthroline 衍生物(如：BCP)之一 者； 於此定義，包含以CBP材料做為第二有機發光材料 5 32，另舉凡僅有最低空執道絕對值小於第一有機發光材料 31最低空執道3la絕對值之材料者(如圖三揭示最高佔據軌 道絕對值相等、圖四揭示最高佔據執道絕對值小於第一有 機發光材料31最南佔據執道絕對值所代表者)，或僅有最高 佔據執道絕對值大於第一有機發光材料31最高佔據執道 ίο 31b絕對值之材料者(如圖五揭示最低空軌道絕對值相等、 圖六揭示最低空執道絕對值大於第一有機發光材料31最低 空執道絕對值所代表者），皆稱之為「寬能隙」材料^ 以下復對本發明之有機發光元件1具有高發光效率及 可產生偏深藍色光敘述： 15 首先，請參閱第七、八圖所示之本發明有機發光元件i 的電流密度與發光效率關係圖及CIE座標圖，在圖七中， 數子「1」代表著發光元件在第一有機發光材料3丨僅摻雜 第二有機發光材料33而未有第二有機發光材料32加入 時，於不同電流密度條件下，所測得的發光效率平均為 2〇 13.7(cd/A)，於此稱之為原藍光系統發光效率； #復請配合圖八所示，其中數字「丨」亦即發光元件在未 有第一有機發光材料32加入時所產生藍光的CIE座標，其 座才示位置平均坐落於(x=0 16，y=〇 32)，從上述數據可知， 發光元件在未有第二有機發光材料32加入的狀態下，雖具 -9- 1238021 f的光’俾有助於獲得色飽和度極麵白光，及有助於製 作全彩顯示器。 另值侍一提的是，本發明之有機發光元件亦可省去 、El〇2材料，而僅於第一有機發光材料31中摻雜「寬能 =的機發光材料，如此亦可獲得可產生偏深藍色匕 、只先7G件，惟此方式將略使發光效率降低，至 有機發光材料之㈣的可能變化如第九至十 樣，於此不予贅述。 口所不之態 以上所述者，僅為本發明之較佳可行實施例 舉凡應用本發明說明書及申請專利範圍所為之 化，理應包含在本發明之專利範圍内。*'、、 政結構變 10 1238021 【圖式簡單說明】 第一圖係本發明一較佳實施例之結構示意圖。 第二圖係本發明上述較佳實施例之能隙圖。 第二圖類同第二圖，說明第二有機發光材料之最高佔 據軌道絕對值等於第一有機發光材料之最高佔據執道絕對 值。 第四圖類同第二圖，說明第二有機發光材料之最高佔 據軌道絕對值小於第一有機發光材料之最高佔據軌道絕對馨 值0 10 第五圖類同第二圖，說明第二有機發光材料之最低空 軌道絕對值等於第一有機發光材料之最低空執道絕對值。 第六圖類同第二圖，說明第二有機發光材料之最低空 執道絕對值大於第一有機發光材料之最低空軌道絕對值。 第七圖係本發明上述較佳實施例之電流密度與發光效 15率關係圖。 第八圖係本發明上述較佳實施例之CIE座標圖。 ⑩ 第九圖係本發明發光元件未摻雜IDE102材料時之能 隙圖。 第十圖類同第九圖，說明第二有機發光材料之最高佔 2〇據執道絕對值等於第一有機發光材料之最高佔據執道絕對 值0 第十一圖類同第九圖，說明第二有機發光材料之最高 佔據執道絕對值小於第一有機發光材料之最高佔據執道絕 對值。 -12- I238〇2i 和第十二圖類同第九圖，說明第二有機發光材料之最低 空軌道絕對值等於第一有機發光材料之最低空軌道絕對 值。 第十三圖類同第九圖，說明第二有機發光材料之最低 空轨道絕對值大於第一有機發光材料之最低空軌道絕對 值〇1238021 The research and development experience of organic light-emitting devices eventually resulted in the invention. [Summary of the Invention] The main object of the present invention is to provide an organic light emitting element, which has high luminous efficiency and can produce deep blue light. In order to achieve the above purpose, an organic light-emitting element provided by the present invention includes:-an anode;-a cathode;-an organic light-emitting layer interposed between the anode and the cathode, and the organic light-emitting layer emits blue light The organic light-emitting layer includes: a first organic light-emitting material; a second organic light-emitting material, which is a dopant of the first organic light-emitting material, and the second organic light-emitting material; The energy gap is larger than the energy gap of the first organic light emitting material. [Embodiment] Hereinafter, the preferred embodiments of the present invention will be enumerated, and will be described in detail with reference to the following figure 15. Among them: The first diagram is a schematic structural diagram of a preferred embodiment of the present invention. The second diagram is the energy gap diagram of the above preferred embodiment of the present invention. The third diagram is similar to the second diagram, and illustrates the highest occupation of the second organic light-emitting material: According to the absolute value of the orbit, the highest occupied orbit of the first organic light-emitting material is equal to the absolute 2G value. The fourth diagram is similar to the second diagram, and shows that the absolute value of the highest occupational ethics of the second organic light emitting material is smaller than the absolute value of the highest occupational ethics of the first organic light emitting material. The fifth diagram is similar to the second diagram, and illustrates that the absolute value of the lowest space of the second organic light-emitting material is equal to the absolute value of the lowest space of the first organic light-emitting material. The sixth diagram is similar to the second diagram, and illustrates that the absolute value of the lowest empty orbit of the second organic light emitting material is greater than the absolute value of the lowest empty track of the first organic light emitting material. The seventh graph is a graph of the relationship between the current density and the luminous efficiency of the above-mentioned preferred embodiment of the present invention. The eighth diagram is a CIE coordinate diagram of the above-mentioned preferred embodiment of the present invention. The ninth figure is an energy gap diagram when the light emitting element of the present invention is not doped with the PD02 material. The tenth graph is similar to the ninth graph, and illustrates that the maximum occupation of the second organic light-emitting material is equal to the highest occupational value of the -organic light-emitting material. The eleventh figure is similar to the ninth figure, and shows that the absolute value of the highest occupation rule of the second organic light-emitting material is smaller than that of the first-organic light-emitting material. * The eleventh figure is the same as the ninth figure, illustrating the lowest value of the second organic light-emitting material: the absolute value of the orbit is equal to the absolute value of the lowest empty road of the first-organic light-emitting material. The lowest organic light-emitting material: the absolute value of the orbit is greater than the absolute empty orbital machine of the -th organic light-emitting material ^, as shown in the second figure, which is the invention-the preferred embodiment of the piano is 1 structure. From bottom to top; 5 is a substrate 1G with a ιτο anode u on the surface, a layer of 6- 1238021, a layer 30, an electron transport layer 40, an electron injection layer 50 and a cathode 60, which are described first, in this embodiment The organic light-emitting materials used in this example are based on small molecular materials, and the film layers are formed by steaming. The following describes the materials and film thicknesses used for each layer and layer, including: X The electric / same transport layer 20 is prepared by depositing a triarylamij ^ s material on a 4 ITO anode substrate 10 ±, and its thickness is Angstrom. The organic light-emitting layer 30 is formed on the hole-transporting layer 20 and has a thickness of 400, (). In this embodiment, the organic light-emitting layer 3 () is doped with three organic light-emitting materials, where: DSA (distyrylarylenes) material is selected as the first organic light-emitting material 31. The energy gap between the lowest empty road 31a (LUMO) and the highest occupied road 31b (HOMO) is shown by the thick black line frame in Figure 2. ; CBP material is selected as the second organic light-emitting material 32, and its energy gap = represented by the thin dashed line in FIG. 2, that is, the dashed line portion beyond the range of the thick black frame, in other words, the second organic light-emitting material in this case The absolute value of the lowest empty road 32a of 32 is smaller than that of the first organic light-emitting material 31, the absolute value of the empty track 31a, and the absolute value of the second organic light-emitting material 32 occupying the upper 32b is larger than that of the first organic The highest value of the luminescent material 31 occupies the absolute value of the doctrine 31b. The IDE102 material published by Idemitsu Kosan Co., Ltd. is used as the third organic luminescent material 33. The energy gap is shown by the thick dashed line in FIG. The dashed part of the wireframe range, in other words, this situation The absolute value of the lowest empty road 33a of the second organic light-emitting material 33 below is larger than the absolute value of the lowest empty road 31a of the first organic light-emitting material 31, and 1238021 The absolute value is smaller than the absolute value of the highest occupation rule 31b of the first organic light-emitting material 31; the second organic light-emitting material 32 and the third organic light-emitting material 33 5 are dopants of the first organic light-emitting material 31 (dopant), and the doping concentration of the second organic light-emitting material 32 is 1% to 50% of the first organic light-emitting material 31, preferably between 1% and 30%, and the third organic light-emitting material The doping concentration of 33 is 3% of the first organic light emitting material 31, and the electron transport layer 40 is formed by depositing an Alcl material on the organic light emitting layer 30, and has a thickness of 200 angstroms (A). The electron injection layer 50 is formed by depositing a UF material on the electron transport layer 40 and has a thickness of 7 angstroms (A). The cathode 60 is made of A1 material, which is located on the electron injection layer 50 and has a thickness of 15,000 Angstroms (A). The above is the composition description of a preferred embodiment of the organic light-emitting element 1 of the present invention, but it must be emphasized that the constituent materials of each film layer are not limited to the above. Taking the organic light-emitting layer 30 as an example, the first organic light-emitting material is 31 尚 T is far from a perylene derivative, a dipyrazolopyridine derivative, a 20bis (styryl) amine derivative, or one of other benzene ring type materials; a organic light emitting material 32 may be selected from star-burst compounds (such as : M-MTDATA, 2-TNATA), N-arylimidazoles derivatives (such as: TPBI), triazole derivatives (such as: TAZ), oxadiazole derivatives (such as: PBD), triaryl amine, biphenyi amine derivatives (such as ··· TCTA, 1238021 mCP each), 1,3-butadiene e derivatives (such as: TPB), hydroxyqUino metal complex (such as: BAlq) or phenanthroline derivatives (such as: BCP); as defined herein, including CBP materials As the second organic light-emitting material 5 32, in addition, only those materials whose absolute value of the minimum empty road is less than the absolute value of the minimum empty road 31a of the first organic light-emitting material 31 (as shown in Figure 3, the absolute values of the highest occupied orbits are equal, Sijie The absolute value of the highest occupational dominance is less than the absolute value of the southernmost occupational dominance of the first organic light-emitting material 31), or only the absolute value of the highest occupational dominance is greater than the highest occupational dominance of the first organic light-emitting material 31. 31b absolute value The material (as shown in Figure 5 reveals that the absolute values of the lowest empty orbits are equal, and Figure 6 reveals that the absolute value of the lowest empty orbit is greater than the absolute value of the lowest organic charge of the first organic light-emitting material 31) are all called "wide energy gap "Material ^ The following is a description of the organic light-emitting element 1 of the present invention having high light-emitting efficiency and can produce deep blue light: 15 First, please refer to the relationship between the current density and light-emitting efficiency of the organic light-emitting element i of the present invention shown in Figures 7 and 8 Figure and CIE coordinate diagram. In Figure 7, the number "1" indicates that the light-emitting element is doped with the second organic light-emitting material 33 and the second organic light-emitting material 32 is not added. Under different current density conditions, the measured luminous efficiency is an average of 20.13.7 (cd / A), which is referred to as the luminous efficiency of the original blue light system; #Please refer to Figure 8, where the number "丨" is also That is, the CIE coordinates of the blue light generated by the light-emitting element when the first organic light-emitting material 32 is not added are located at (x = 0 16, y = 〇32), and it can be seen from the above data that the light-emitting element is not In the state where the second organic light emitting material 32 is added, although the light of -9-1238021 f is used, it is helpful to obtain extreme white light with color saturation, and it is helpful to make a full-color display. It is also worth mentioning that the organic light-emitting element of the present invention can also omit the ElO2 material, and only the first organic light-emitting material 31 is doped with a "broad energy = organic light-emitting material", so that it can also be obtained. A dark blue dagger is produced, and only 7G pieces are used, but this method will slightly reduce the luminous efficiency, and the possible changes to the organic light-emitting materials are as the ninth to tenth, so I will not repeat them here. The authors are only the preferred and feasible embodiments of the present invention, and the application of the description of the present invention and the scope of patent application should be included in the scope of the patent of the present invention. * ',, political structure change 10 1238021 [Schematic description The first diagram is a schematic structural diagram of a preferred embodiment of the present invention. The second diagram is an energy gap diagram of the above-mentioned preferred embodiment of the present invention. The second diagram is similar to the second diagram and illustrates the highest occupation of the second organic light-emitting material. The absolute value of the orbit is equal to the absolute value of the highest occupation of the first organic light-emitting material. The fourth diagram is similar to the second diagram, which shows that the absolute value of the highest occupation of the second organic light-emitting material is smaller than that of the first organic light-emitting material. The absolute value of the channel is 0 10 The fifth image is similar to the second image, and the absolute value of the lowest empty orbit of the second organic light-emitting material is equal to the absolute value of the lowest empty track of the first organic light-emitting material. The sixth image is similar to the second image, Explain that the absolute value of the lowest empty track of the second organic light-emitting material is greater than the absolute value of the lowest empty orbit of the first organic light-emitting material. The seventh graph is a relationship diagram between the current density and the luminous efficiency of the above-mentioned preferred embodiment of the present invention. The diagram is the CIE coordinate diagram of the above-mentioned preferred embodiment of the present invention. ⑩ The ninth diagram is an energy gap diagram when the light-emitting element of the present invention is not doped with IDE102 material. The tenth diagram is similar to the ninth diagram, and illustrates the second organic light-emitting material. The highest occupational absolute value of 20 is equal to the absolute maximum occupational value of the first organic light-emitting material. The eleventh diagram is similar to the ninth diagram, indicating that the absolute maximum occupational value of the second organic light-emitting material is smaller than that of the first organic light-emitting material. The highest value of the luminescent material occupies the absolute value. -12- I238〇2i and the twelfth figure are similar to the ninth figure, indicating that the absolute value of the lowest empty orbit of the second organic light-emitting material is equal to the lowest value of the first organic light-emitting material. The absolute value of the track. FIG similar ninth thirteenth diagram illustrating the lowest unoccupied molecular orbital of the second organic light emitting material is greater than the absolute value of the lowest unoccupied molecular orbital of the first organic light emitting material, the absolute value of the square
【主要元件符號說明】 1 有機發光元件 10 10 基板 11 ITO陽極 20 電洞傳輸層 30有機發光層 31第一有機發光材料 31a最低空軌道 31b 最高佔據執道 15 32 第二有機發光材料[Description of main component symbols] 1 Organic light-emitting element 10 10 Substrate 11 ITO anode 20 Hole-transport layer 30 Organic light-emitting layer 31 First organic light-emitting material 31a Lowest empty orbit 31b Highest occupation rule 15 32 Second organic light-emitting material
32a最低空執道 32b 最高佔據軌道 33第三有機發光材料 33a最低空軌道 33b 最高佔據執道 40 電子傳輸層 2〇 50 電子注入層 60 陰極 -13-32a Lowest empty track 32b Highest occupied track 33 Third organic light emitting material 33a Lowest empty track 33b Highest occupied track 40 Electron transport layer 2 0 50 Electron injection layer 60 Cathode -13-