Improve efficiency of white organic light-emitting diodes by using nanosphere arrays in color conversion layers
Journal
Optics Express
Journal Volume
20
Journal Issue
3
Pages
3005-3014
Date Issued
2012-01
Author(s)
Ho, Yu-Hsuan
Chang, Yung-Ting
Ye, Ya-Han
Chu, Chih-Wei
Tian, Wei-Cheng
Chen, Chin-Ti
Wei, Pei-Kuen
Abstract
The authors demonstrated an efficient color conversion layer (CCL) by using nanosphere arrays in down-converted white organic light-emitting diodes (WOLEDs). The introduced periodical nanospheres not only helped extract the confined light in devices, but also increased the effective light path to achieve high-efficiency color conversion. By applying a CCL with red phosphor on a 400-nm-period nanosphere array, we achieved 137% color conversion ratio for blue OLEDs, which was 2.68 times higher than conventional flat CCL. The resulting luminous efficiency of WOLEDs with patterned CCLs (20.97 cd/A, 1000 cd/m2) was two times higher than the efficiency of the flat device (10.26 cd/A, 1000 cd/m2). © 2012 Optical Society of America.
Other Subjects
Color; Efficiency; Light emission; Nanospheres; Organic light emitting diodes (OLED); Blue OLEDs; Color conversions; Light path; Luminous efficiency; Red phosphors; White organic light emitting diodes; Optoelectronic devices; nanosphere; article; chemistry; color; equipment; equipment design; illumination; instrumentation; nanotechnology; semiconductor; ultrastructure; Color; Equipment Design; Equipment Failure Analysis; Lighting; Nanospheres; Nanotechnology; Semiconductors
Type
journal article