Reflective colored organic light-emitting diodes for light-adaptable display

Abstract

A new light-adaptable display (LAD), consisting of reflective, colored, organic light-emitting diodes (RCOLEDs) and an optical shutter (OS), was fabricated. The RCOLED is composed of a color-selective reflective filter (CSRF) functioning in reflective mode under bright conditions, and a transparent OLED (TOLED) working in emissive mode under relatively dark conditions. The OS functions to pass or shield the light generated in the TOLED or from the outer environment. In this RCOLED, the CSRF was designed based on the concept of Fabry-Pérot interferometry to represent a specific color of red, blue, and green. The TOLED was designed using a low-reflective multi-layered graphene as an top electrode to suppress the distorted optical interference from reflective mirrors in the RCOLED. The color reproduction range calculated from RCOLEDs with a graphene top electrode was dramatically improved (35.0%), compared to that computed from RCOLEDs with a semi-transparent thin-silver top electrode (2.4%). Finally, we demonstrate that the new dual-mode LAD works well. Copyright © 2016 American Scientific Publishers All rights reserved