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

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


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) ...Show More

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) /Alq3(tris8-hydroxyquinoline-aluminum)/LiF/Al and the symmetrical current-voltage curve for Al/LiF/Alq3/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.
Date of Conference: 15-17 December 2014
Date Added to IEEE Xplore: 05 February 2015
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Conference Location: Charlotte, NC, USA

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