聚合物材料以及有機發光二極體元件

專利類型

發明

專利國別 (專利申請國家)

中華民國

專利申請案號

107101286

專利證號

I 655214

專利獲證名稱

聚合物材料以及有機發光二極體元件

專利所屬機關 (申請機關)

元智大學

獲證日期

2019/04/01

技術說明

合成出三條具有雙極性基團並懸掛在聚苯乙烯側鏈的高分子P-CBZ-OXD, P-CBZ-TAZ, P-CBZ-BZI作為藍光及綠光磷光元件和具有熱活化延遲螢光(thermal activated delayed fluorescence, (TADF))發光特性的主體材料。雙極性基團是藉由導入具有電洞傳輸功能及高的三重態能量的咔唑(carbazole)，以苯環鄰位個別的連接三種具有不同電子傳輸特性的材料(惡二唑(1,3,4-oxadiazole)、三氮唑(1,2,4-triazole)、苯並咪唑(benzimidazole))，使高分子具有雙極性的特性。藉由苯環鄰位連接，能有效的截斷共軛長度，使高分子具有高的三重態能量；在熱性質中，因具有剛硬的結構，能使獲得較高的玻璃轉移溫度和熱烈解溫度；並藉由電化學研究發現，高分子皆可量測到氧化和還原峰訊號，表示皆具有電子、電洞傳輸能力，其中以P-CBZ-OXD高分子具有與客發光體較匹配的能階，因此元件表現最好；在藍色磷光發元件架構為ITO/PEDOT: PSS/P-CBZ-OXD: 20% FIrpic/SPPO13/Mg/Ag時，最大亮度與效率分別為1763 cd/m2和11.0 cd/A;在綠色磷光元件架構為ITO/PEDOT: PSS/P-CBZ-OXD: 15% Ir(ppy)3/SPPO13/Mg/Ag時，最大亮度與效率分別為7215 cd/m2和23.7 cd/A，而以具有TADF特性的綠光材料作為客發光體時，在元件架構為ITO/PEDOT: PSS/P-CBZ-OXD: 15% 4CzIPN/SPPO13/Mg/Ag時，最大亮度與效率分別為5592 cd/m2和27.3 cd/A。 PS-based polymers P-CBZ-OXD, P-CBZ-TAZ, P-CBZ-BZI with bipolar groups on the side chain as hosts for application in blue- and green-light, as well as thermal activated delayed fluorescence-based (TADF-based) PLED. The bipolar groups contain ortho-substituted of carbazole (CBZ)/1,3,4-oxadiazole (OXD), CBZ/1,2,4-triazole (TAZ) or CBZ/benzimidazole (BZI) respectively to afford the polymers with a bipolar function. CBZ has a high triplet energy (ET) gap and as hole-transporting moiety. The electron- deficient aromatic heterocycles of OXD, TAZ and BZI groups are as an electron- transporting moiety. All polymers show good thermal stability with high glass transition temperature (Tg) and decomposition temperature (Td) due to their rigid structure. By ortho-substituted between the bipolar groups can effectively interrupt conjugation length to obtain higher ET. According to electrochemical study, the results indicated the polymers with hole- and electron-transporting abilities. Moreover, we found that P-CBZ-OXD have more suitable match of energy level than that of P-CBZ-TAZ and P-CBZ-BZI. The best device performance of blue phosphorescent consisted of ITO/PEDOT: PSS/P-CBZ-OXD: 20% FIrpic/SPPO13/Mg/Ag that showed the maximum brightness of 1763 cd/m2 and the maximum current efficiency of 11.0 cd/A. For the best device performance of green phosphorescent consisted of ITO/PEDOT: PSS/P-CBZ-OXD: 15% Ir(ppy)3/ SPPO13/ Mg/Ag with the maximum brightness of 7215 cd/m2 and the maximum current efficiency of 23.7 cd/A. Besides, a green TADF emitter of 1,2,3,5-tetrakis (carbazol-9-yl)-4,6- dicyanobenzene (4CzIPN) was employed as guest, the devices consisted of ITO/PEDOT: PSS/P-CBZ-OXD: 15% 4CzIPN /SPPO13/Mg/Ag that owned the maximum brightness of 5592 cd/m2 and the maximum current efficiency of 27.3 cd/A.

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