Dual-periodic-microstructure-induced color tunable white organic light-emitting devices

Abstract

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.

Graphical abstract

Keywords

dual periodic grating / surface plasmon-polariton (SPP) / color tunable / white organic light-emitting devices (WOLEDs)

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Acknowledgments

The authors gratefully acknowledge support from the National Basic Research Program of China (973 Program) (No. 2013CBA01700), the National Natural Science Foundation of China (NSFC) (Grant Nos. 61322402, 91233123 and 61177024).

RIGHTS & PERMISSIONS

2016 Higher Education Press and Springer-Verlag Berlin Heidelberg