雙偶極咔唑三氮唑衍生物為主體材料之藍光磷光有機發光二極體及倒置有機光伏電池

Abstract

於本篇論文中第一部分，我們使用雙偶極之咔唑及三氮唑衍生物9,9'-(2-(4,5-diphenyl-4H-1,2,4-triazol-3-yl)-1,3-phenylene)bis(9H-carbazole) (CbzTAZ)作為主體材料及 Iridium(III)bis[(4,6-difluorophenyl)-pyridinato-N,C2’]picolinate (FIrpic) 作為客體材料來製作藍光磷光有機發光二極體。 藉由調變摻雜濃度及結構厚度，能達到 52.36 cd/A 的最高電流效率、46.1 lm/W 的最高功率效率及23.29% 的最高外部量子效率。 另一部分，我們以boron subphthalocyanine (SubPc)作為施體材料及C60作為受體材料來製作倒置有機光伏電池。於陰極端加入氧化鋅層及陽極端以氧化鉬層作為緩衝層來減少能接不匹配的限制。接著，我們調變C60的厚度及氧化鉬層厚度達到載子平衡，並且藉由光場分佈來降低C60的吸收，達到窄吸收頻普，將可應用於分光系統上。相較於傳統結構，此倒置結構將能獲更多載子，且將功率轉換效率自2.89%提升至3.66%。此外，我們於倒置結構上去除C60來製作無炭球元件，並將其開路電壓推至接近SubPc的理論極限的1.34 V。

In this thesis, we fabricated the blue phosphorescent organic light-emitting diodes (PhOLEDs) with bipolar crbazole-triazole derivative material, 9,9'-(2-(4,5-diphenyl-4H-1,2,4-triazol-3-yl)-1,3-phenylene)bis(9H-carbazole) (CbzTAZ), as host and Iridium(III)bis[(4,6-difluorophenyl)-pyridinato-N,C2’]picolinate (FIrpic) as guest. By optimizing the dopant ratio of phosphor in host and the thickness of architecture, the maximum current efficiency of 52.36 cd/A, power efficiency of 46.1 lm/W, and external quantum efficiency of 23.29% were achieved. The other part, we fabricated inverted photovoltaic cells (OPVs) with boron subphthalocyanine (SubPc) as donor material and C60 as acceptor material. By inserting ZnO as a buffer layer at cathode side and MoO3 as a buffer layer at anode side, the ability of carrier extraction will not be restricted by the mismatch of energy level. Further, we tuned the thickness of C60 and optical distribution by the thickness of MoO3 to achieve hole-electron balance and decrease light absorption of C60 to obtain keen absorption spectrum for the application of spectral splitting system. Compared with conventional structure, it can derive more carriers and enhance power conversion efficiency from 2.89% to 3.66%. Besides, we took off C60 to be a fullerence-free OPVs and pushed open-circuit voltage to 1.34 V, which is approaching to the physical limit of SubPc.