Composite electrode with gate-tunable work function for optoelectronic devices
Abstract
The work function (WF) of Al:LiF composite electrode is first reported to be tunable by electrostatic field effect via the polarization of LiF on Al atom layer. This observation was demonstrated in Kelvin probe force microscope measurement. The optimized Al:LiF composite electrode was employed as organic light emitting diode (OLED) cathode to show the electroluminescent brightness increased from 0 cd m−2 to >8000 cd m−2 and sub second temporal response in an electrolyte gated OLEDs, superior to LiF/Al and Al electrodes. These results are plausibly ascribed to the augmented electron injection with the concurrence of the upward shift of cathode WF induced by gating potential, leading to the improved electron/hole injection balance for efficient electroluminescence.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 19, 2017
- Source ID
- 10.1063/1.4985863
Entities
People
- Fangchao Zhao
- Huaping Li
- Jiang Liu
- Lili Zhou
- Xinning Luan