Impact of the LiF/Al/Au and stacked phase tuning layers on the viewing angle of high contrast-ratio tandem organic light emitting devices

Document Type

Conference Proceeding

Publication Title

2014 11th Annual High Capacity Optical Networks and Emerging/Enabling Technologies (Photonics for Energy)

Publisher

IEEE

School

Electron Science Research Institute

RAS ID

18609

Comments

Ding, B. F., & Alameh, K. (2014). Impact of the LiF/Al/Au and stacked phase tuning layers on the viewing angle of high contrast-ratio tandem organic light emitting devices. In Proceedings of the IEEE 2014 11th Annual High Capacity Optical Networks and Emerging/Enabling Technologies (Photonics for Energy) (pp. 234-237). IEEE. Available here

Abstract

The impact of a LiF/Al/Au composite layer on both electrical performance and optical performance of high contrast-ratio tandem organic light emitting devices (HCT-OLEDs) operating in wide viewing angle regimes is investigated. The strong photon emission from Al/Au/ NPB(N,N'-di(naphthalene-1-yl)- N,N'-diphenylbenzidine) /Alq 3 (tris8-hydroxyquinoline-aluminum)/LiF/Al and the symmetrical current-voltage curve for Al/LiF/Alq 3 /LiF/Al verify the hole-injecting anodic and the electron-injecting cathodic roles of Al(4 nm)/Au(7 nm) and Al(4 nm)/LiF(0.7 nm), respectively. The reflectivity spectrum is measured for viewing angles ranging from 5° to 50°. Experimental results show that when the viewing angle is increased from 5° to 50°, the reflectivity spectrum is blue shifted, which affects the contrast of HCT-OLEDs. Importantly, the measured average reflectivity in the visible range for viewing angles below 50° is as low as 6.6%, making the proposed HCT-OLEDs attractive for flat-panel-display applications.

DOI

10.1109/HONET.2014.7029399

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