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 NameAffiliation
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 
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.
Hits: 1422
Download times: 0
View Full Text    Download reader