Organic white-light-emitting devices based on a multimode resonant microcavity

摘要

Organic white-light-emitting devices (OLEDs) based on a multimode resonant microcavity defined by a pair of dielectric mirrors and metal mirrors were presented. By selective effects of the quarter-wave dielectric stack mirror on mode, white light emission containing three individual narrow peaks of red, green and blue was achieved, and showed weak dependence on the viewing angle. The Commission Internationale De L'Eclairage (CIE) chromaticity coordinates changed from (0.29, 0.37) at 0° to (0.31, 0.33) at 40°. Furthermore, the brightness and electroluminescence efficiency of the microcavity OLEDs were enhanced compared with noncavity OLEDs. The maximum brightness reached 1940 cd m~(-2) at a current density of 200 mA cm~(-2), and the maximum current efficiency and power efficiency are 1.6 cd A~(-1) at a current density of 12 mA cm~(-2) and 0.41 lm W~(-1) at a current density of 1.6 mA cm~(-2), which are over 1.6 times higher than that of a noncavity OLED.