Blue Phosphorescent Organic Light-Emitting Diodes with Bipolar Carbazole-triazole Derivatives as Host Material, and Inverted Organic Photovoltaic Cells
Date Issued
2014
Date
2014
Author(s)
Wang, Po-Sheng
Abstract
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.
Subjects
藍光磷光有機發光二極體
效率
倒置結構
分光系統
開路電壓
SDGs
Type
thesis
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