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

2014 11th Annual High Capacity Optical Networks and Emerging/Enabling Technologies (Photonics for Energy) Pub Date : 2014-12-01 DOI:10.1109/HONET.2014.7029399

B. Ding, K. Alameh

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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.

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LiF/Al/Au和堆叠相位调谐层对高对比度串联有机发光器件视角的影响

研究了LiF/Al/Au复合层对高对比度串联有机发光器件(hct - oled)在宽视角下的电性能和光学性能的影响。Al/Au/ NPB(N,N′-二(萘-1-基)- N,N′-二苯基联苯胺)/ Alq3(tris8-羟基喹啉-铝)/LiF/Al的强光子发射和Al/LiF/Al的对称电流-电压曲线分别验证了Al(4 nm)/Au(7 nm)和Al(4 nm)/LiF(0.7 nm)的空穴注入阳极和电子注入阴极作用。反射率光谱测量的视角范围从5°到50°。实验结果表明，当视角从5°增加到50°时，反射率谱发生蓝移，影响了hct - oled的对比度。重要的是，在视角低于50°的可见范围内，测量到的平均反射率低至6.6%，这使得hct - oled在平板显示应用中具有吸引力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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

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