Dual-periodic-microstructure-induced color tunable white organic light-emitting devices
Yangang BI , Jinhai JI , Yang CHEN , Yushan LIU , Xulin ZHANG , Yunfei LI , Ming XU , Yuefeng LIU , Xiaochi HAN , Qiang GAO , Hongbo SUN
Front. Optoelectron. ›› 2016, Vol. 9 ›› Issue (2) : 283 -289.
Dual-periodic-microstructure-induced color tunable white organic light-emitting devices
In this paper, we demonstrate a color tunable white organic light-emitting devices (WOLEDs) based on the two complementary color strategies by introducing two-dimensional (2-D) dual periodic gratings. It is possible to tune the color in a range between cold-white and warm-white by simply operating the polarization of polarizer in front of the microstructured WOLEDs. Experimental and numerical results demonstrate that color tunability of the WOLEDs comes from the effect of the 2-D dual periodic gratings by exciting the surface plasmon-polariton (SPP) resonance associated with the cathode/organic interface. The electroluminescence (EL) performance of the WOLEDs have also been improved due to the effective light extraction by excitation and out-coupling of the SPP modes, and a 39.65% enhancement of current efficiency has been obtained compared to the conventional planar devices.
dual periodic grating / surface plasmon-polariton (SPP) / color tunable / white organic light-emitting devices (WOLEDs)
Higher Education Press and Springer-Verlag Berlin Heidelberg
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