Title :
Yellowing effects of TiO2/Epoxy nano composite layer on organic light emitting diodes with internal light extraction structure
Author :
Cho, Ooo-Hee ; Choi, Seongwoo ; Shin, Jin-Wook ; Moon, Jaehyun ; Han, Jun-Han ; Huh, Jin Woo ; Joo, Chul Woong ; Hwang, Joohyun ; Chu, Hye Yong ; Lee, Jeong-Ik
Author_Institution :
OLED Lighting Team, ETRI, Daejeon, South Korea
Abstract :
We have developed the highly efficient OLEDs using the embossed glass substrate and the low yellowing TiO2/Epoxy nano composite layer. The nano composite can be applied to a scattering layer and a planarization layer on an embossed glass. The TiO2/Epoxy nano composite was effective for increasing the light extraction efficiency of OLEDs, however the yellowing degraded the luminous efficacy seriously. The luminous efficacy of the OLED with the nano composite layer on the embossed glass was 21.0 lm/W at 1000 cd/m2 and it increased by 36% compared to the conventional OLED.
Keywords :
nanocomposites; organic light emitting diodes; planarisation; resins; titanium compounds; SiO2; TiO2; embossed glass substrate; epoxy nanocomposite layer; internal light extraction; luminous efficacy; organic light emitting diodes; planarization layer; scattering layer; yellowing effects; Current measurement; Indium tin oxide; Moisture measurement; Organic light emitting diodes; Refractive index; Substrates;
Conference_Titel :
Nanotechnology Materials and Devices Conference (NMDC), 2011 IEEE
Conference_Location :
Jeju
Print_ISBN :
978-1-4577-2139-7
DOI :
10.1109/NMDC.2011.6155326
