Impact of high voltage on the performance of high-contrast-ratio organic light emitting devices

Document Type

Conference Proceeding

Publication Title

2014 Conference on Optoelectronic and Microelectronic Materials and Devices

Publisher

IEEE

School

Electron Science Research Institute

RAS ID

18610

Comments

Ding, B. F., & Alameh, K. (2014, December). Impact of high voltage on the performance of high-contrast-ratio organic light emitting devices. In Proceedings of the IEEE 2014 Conference on Optoelectronic and Microelectronic Materials and Devices (pp. 44-47). Available here

Abstract

The role of ultra-thin buffer layer of C 60 in recently developed high contrast-ratio tandem organic light emitting devices (HCT-OLEDs) is experimentally investigated. The strong photon emission of Al/C 60 / N, N'-di(naphthalene-1-yl)- N, N'- diphenylbenzidine/tris8-hydroxyquinoline-aluminum/LiF/Al verifies the efficient hole-injecting role of Al (7 nm)/C 60 (2.5 nm). When the applied voltage is higher than 15 V, abrupt drop in current is experienced and the peak of the electroluminescence spectrum vanishes as a result of the phase tuning structure of the HCT-OLED. This demonstrates that the Al/C 60 anode performance is unstable under high voltage operation. Such instability causes HCT-OLED power efficiency to drop significantly, necessitating more stable buffer layers to be used instead of C 60 in order to realise viable HCT-OLEDs for display applications.

DOI

10.1109/COMMAD.2014.7038648

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