Abstract
It is challenging to obtain broadband emission covering as much of the visible light spectrum as possible in top-emitting white organic light-emitting diodes (TEWOLEDs) due to the well known microcavity effects. In this work, we achieved TEWOLED with three separate peak and negligible angular dependence by employing a high transmittance stack cathode Al (2nm)/Cu (18)/TcTa (60nm). The TEWOLED shows an efficiency of 25.6cd/A, 20.1Lm/W at 1000cd/m2, and low voltage of 4.2V for 1222cd/m2. Synchronously, we achieved transparent white organic light-emitting diode (TWOLED) using this high transmittance stack cathode, the TWOLED exhibits similar spectrum and comparable luminance from both sides, and the maximum total efficiencies of the TWOLED are 28.6cd/A, 24.9Lm/W.
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