Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2017-06-21

Journal: JOURNAL OF APPLIED PHYSICS

Included Journals: Scopus、EI、SCIE

Volume: 121

Issue: 23

ISSN: 0021-8979

Abstract: A highly efficient inverted organic light emitting diode using 1.0 nm-thick ZnIx as a hole-blocking layer is developed. We fabricate devices with the configuration ITO/ZnIx (1.0 nm)/Alq(3) (50 nm)/NPB (50 nm)/MoO3 (6.0 nm)/Al (100 nm). The deposition of a ZnIx layer increases the maximum luminance by two orders of magnitude from 13.4 to 3566.1 cd/m(2). In addition, the maximum current efficiency and power efficiency are increased by three orders of magnitude, and the turn-on voltage to reach 1 cd/m(2) decreases from 13 to 8V. The results suggest that the electron injection efficiency is not improved by introducing a ZnIx layer. Instead, the improved device performance originates from the strong hole-blocking ability of ZnIx. This work indicates that layered materials may lead to novel applications in optoelectronic devices. Published by AIP Publishing.