Suppressing triplet state extension for highly efficient ambipolar phosphine oxide host materials in blue PHOLEDs.
A series of phosphine oxide hosts were constructed to investigate the influence of the triplet state extension in hosts on electrophosphorescence, in which DPESPOPhCz with the carbazolyl-localized triplet state endowed its blue-emitting PHOLEDs with favourable performance, including an external quantum efficiency more than 13%.
Key Laboratory of Functional Inorganic Material Chemistry, School of Chemistry and Materials, Heilongjiang University, Ministry of Education, Harbin 150080, P. R. China. hxu@hlju.edu.cn.
Chunmiao
C
Han
Liping
L
Zhu
Fangchao
F
Zhao
Zhen
Z
Zhang
Jianzhe
J
Wang
Zhaopeng
Z
Deng
Hui
H
Xu
Jing
J
Li
Dongge
D
Ma
Pengfei
P
Yan