Separation of electrical and optical energy gaps: selectively adjusting the electrical and optical properties for a highly efficient blue emitter.
The design concept of separation of optical and electrical bandgap for wide bandgap materials is further developed in DCzSiPI. The HOMO/LUMO levels can be tuned by incorporation of PI and DCz substituents. The tetraphenylsilane core avoids the intramolecular charge transfer from DCz to PI (DCz = dimer carbazole, PI = phenanthro[9,10-d]imidazole). The allowed transitions are found to be from HOMO-1 to LUMO providing DCzSiPI with sufficient bandgap.
State Key Laboratory of Supramolecular Structure and Materials, Jilin University, 2699 Qianjin Avenue, Changchun, 130012 (P.R. China).
He
H
Liu
Ping
P
Chen
Dehua
D
Hu
Xiangyang
X
Tang
Yuyu
Y
Pan
Huanhuan
H
Zhang
Wenqiang
W
Zhang
Xiao
X
Han
Qing
Q
Bai
Ping
P
Lu
Yuguang
Y
Ma
bandgap; bipolar; carbazole; donor-acceptor systems; silanes