[Evaluating acceleration ability of electrons of different acceleration layers in solid state cathodoluminescence].
Solid state cathodoluminescence is a brand-new excitation mode. In the device, electron acceleration layer plays a very important role in obtaining high energy hot electrons to excite organic luminescent materials in solid state cathodoluminescence. Two kinds of structural devices (A: ITO/MEH-PPV/SiO2/Al, B: ITO/MEH-PPV/ZnO/Al) were fabricated. The theoretical calculation and analysis show that the tunnel current and electric field was higher in SiO2 layer than that in ZnO layer under the same applied driving voltage. The experimental results show that the intensity of device A with SiO2 as electrons acceleration layer is stronger than that of device B with ZnO as electrons acceleration layer under the same driving voltage. And the result demonstrated that electrons in the conduction band of SiO2 can be heated to higher energy than that in ZnO.
Li
Jun-Ming
JM
Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University), Ministry of Education and Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing 100044, China.
Xu
Zheng
Z
Zhao
Su-Ling
SL
Zhang
Fu-Jun
FJ
Song
Dan-Dan
DD
Liu
Xiao-Dong
XD
Song
Jing-Lu
JL
Xu
Xu-Rong
XR
Wang
Yong-Sheng
YS