Speckle image holography modulated full-color organic light-emitting diodes with high efficiency and engineered emission profile

Enlightened by holography metasurfaces for controlling the propagation of light, speckle image holography nanostructures were introduced into both fluorescent and phosphorescent OLEDs in order to achieve high efficiency and engineered emission profile. The resulting current efficiency and external quantum efficiency of the nanostructured fluorescent green emission OLEDs were enhanced by up to 99% and 104%, respectively. This enhancement feature is comparable to that of phosphorescent red-and blue emission OLEDs. Furthermore, the enhancement ratios were retained approximately as a constant when the viewing angle varied from 60 to 60 for all three color devices. Experimental and theoretical results directly prove that the light steering is independent of the emission materials, the wavelength, radiation angle, and the polarization of the emitted light We anticipate this paradigm may offer new opportunities for high-end optoelectronic designs and applications. (C) 2016 Elsevier B.V. All rights reserved.