Electrolyte-Gated Red, Green, and Blue Organic Light-Emitting Diodes

Jiang Liu; Dustin Chen; Xinning Luan; Kwing Tong; Fangchao Zhao; Chao Liu; Qibing Pei; Huaping Li

doi:10.1021/acsami.7b00463

Electrolyte-Gated Red, Green, and Blue Organic Light-Emitting Diodes

ACS Appl Mater Interfaces. 2017 Apr 12;9(14):12647-12653. doi: 10.1021/acsami.7b00463. Epub 2017 Apr 3.

Authors

Jiang Liu^{1

2}, Dustin Chen², Xinning Luan¹, Kwing Tong², Fangchao Zhao^{1

2}, Chao Liu², Qibing Pei², Huaping Li¹

Affiliations

¹ Atom Nanoelectronics Inc. , 440 Hindry Avenue, Unit E, Inglewood, California 90301, United States.
² Department of Materials Science and Engineering, University of California Los Angeles , 420 Westwood Plaza, Los Angeles, California 90095, United States.

PMID: 28332395
DOI: 10.1021/acsami.7b00463

Abstract

We report vertical electrolyte-gated red, green, and blue phosphorescent small-molecule organic light-emitting diodes (OLED), in which light emission was modified by tuning the electron injection via electrochemical doping of the electron injection layer 4,4-bis(N-carbazolyl)-1,1-biphenyl (CBP) under the assistance of a polymer electrolyte. These devices comprise an electrolyte capacitor on the top of a conventional OLED, with the interfacial contact between the electrolyte and electron injection layer CBP of OLEDs achieved through a porous cathode. These phosphorescent OLEDs exhibit the tunable luminance between 0.1 and 10 000 cd m^-2, controlled by an applied bias at the gate electrode. This simple device architecture with gate-modulated luminance provides an innovative way for full-color OLED displays.

Keywords: electrochemical doping; electron injection layer; full-color OLED display; gated phosphorescent small molecular OLEDs; nanoporous cathode; polymer electrolyte.