Improved light extraction efficiency of white organic light-emitting devices by biomimetic antireflective surfaces

Abstract

One simple method to increase the light extraction from white organic light-emitting devices by using biomimetic silica antireflective surfaces is demonstrated. A silica cone array was directly etched on the opposite side of the indium–tin–oxide coated fused silica substrate. The antireflective surfaces can dramatically suppress the reflection loss and increase the transmission of light over a large range of wavelength and a large field of view. Using such surfaces, the luminance efficiency of the device in the normal direction is increased by a factor of 1.4 compared to that of the device using flat silica substrate.

Preparation and potential application of functional ordered microstructures

“…In order to improve the performance of optical system, reducing the reflectance and increasing the transparency of silica lenses shows to be very important. Using 2D colloidal crystals as masks in RIE, we constructed SiO 2 nano-cone array on the surface of fused silica substrates [34,39,40]. This kind of nano-cone arrays could effectively reduce the reflectance on the surface of silica, which improved the transparency of the silica lenses.…”

“…This kind of nano-cone arrays could effectively reduce the reflectance on the surface of silica, which improved the transparency of the silica lenses. Preparing nanocone arrays on ITO substrates surface of organic light-emitting devices (OLEDs) would reduce the reflection loss on the surface and increase the luminance efficiency of the devices [40]. Our method is not only applicable for planar substrates, but also could be used in modifying non-planar substrate.…”

“…Many kinds of nocturnal insects use arrays of NCP nipples with sub-300-nm size as antireflective structure (ARS) to reduce reflection from their compound eyes and increase the transparency, in order to improve their eye sight [60][61][62]. Inspired by this kind of compound eyes, we prepared biomimic functional ordered microstructure arrays by using 2D colloidal crystals as etching masks, and tried to apply these ordered microstructures in optical device design [39][40][41][42][43].…”

“…Based on these methods, we have prepared lots of ordered microstructures with special functionalities, controllable components, size and properties [23][24][25][26][27][28][29][30][31][32][33][34][35][36]. Meanwhile, practical application prospects of these ordered microstructures have also been explored [37][38][39][40][41][42][43][44].…”

Enhancement of performance for blue organic light emitting devices by utilizing an adjustable chromaticity layer

“…pioneer work of Tang and VanSlyke [1][2][3]. For this application, it is essential to deliver a set of primary RGB (red, green, and blue) emitters with high efficiency, good chromaticity, as well as excellent operational stability [4].…”