Open AccessLight diffusing effects of nano and micro-structures on OLED with microcavity
Author(s) -
DooHee Cho,
Junhwa Shin,
Chul Woong Joo,
Jonghee Lee,
Seung Koo Park,
Jaehyun Moon,
Nam Sung Cho,
Hye Yong Chu,
Jeong Ik Lee
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.0a1507
Subject(s) - oled , materials science , diffuser (optics) , optoelectronics , luminance , nano , optics , finite difference time domain method , nanotechnology , layer (electronics) , composite material , physics , light source
We examined the light diffusing effects of nano and micro-structures on microcavity designed OLEDs. The results of FDTD simulations and experiments showed that the pillar shaped nano-structure was more effective than the concave micro-structure for light diffusing of microcavity OLEDs. The sharp luminance distribution of the microcavity OLED was changed to near Lambertian luminance distribution by the nano-structure, and light diffusing effects increased with the height of the nano-structure. Furthermore, the nano-structure has advantages including light extraction of the substrate mode, reproducibility of manufacturing process, and minimizing pixel blur problems in an OLED display panel. The nano-structure is a promising candidate for a light diffuser, resolving the viewing angle problems in microcavity OLEDs.