Improvements of phosphorescent white OLEDs performance for lighting application.
We developed white OLED device with high power efficiency, in which blue and orange phosphorescent emitters were used. By introduction of multi-functional interlayer which has partial doping of orange dopant inside EBL, we report WOLEDs with peak external efficiencies up to (14.1% EQE, 31.3 Im/W) without light out-coupling technique. At 1000 cd/m2, the performance achieved was 11.9% EQE, 18.7 Im/W with CIE = (0.39, 0.44). We also found that WOLED performances are related with doping ratio of the orange dopant that was inserted inside EBL.
Lee
Jonghee
J
IT Convergence and Components Laboratory, Electronics and Telecommunications Research Institute, Daejeon, 305-350, Korea.
Chu
Hye Yong
HY
Lee
Jeong-Ik
JI
Song
Ki-Im
KI
Lee
Su Jin
SJ