WANG Zhen,LIU Fei,ZHENG Xin,CHEN Ai,XIE Jia-feng,ZHANG Wen-xia.Study on luminescence characteristics of blue OLED with phosphor-doped host-guest structure[J].Optoelectronics Letters,2018,14(3):164-169 |
Study on luminescence characteristics of blue OLED with phosphor-doped host-guest structure |
Author Name | Affiliation | WANG Zhen | School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China | LIU Fei | School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China | ZHENG Xin | School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China | CHEN Ai | School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China | XIE Jia-feng | School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China | ZHANG Wen-xia | School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China |
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Abstract: |
In this study, we design and fabricate phosphor-doped host-guest structure organic light-emitting diodes (OLEDs), where the blue-ray iridium complex electrophosphorescent material FIrpic acts as object material. Properties of the device can be accommodated by changing the host materials, dopant concentration and thickness of the light-emitting layer. The study shows that the host material N,N'-dicarbazolyl-3,5-benzene (mCP) has a higher triplet excited state energy level, which can effectively prevent FIrpic triplet excited state energy backtracking to host material, thus the luminous efficiency is improved. When mCP is selected as the host material, the thickness of the light-emitting layer is 30 nm and the dopant concentration is 8 wt%, the excitons can be effectively confined in the light-emitting region. As a result, the maximum current efficiency and the maximum brightness of the blue device can reach 15.5 cd/A and 7 196.3 cd/m2, respectively. |
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