Enhanced efficiency of blue phosphorescent organic light-emitting diode base on triple-emitting layer with mixed host system.
We report an improvement of efficiency in blue phosphorescent organic light-emitting diodes (PHOLEDs) based on triple-emitting layer (T-EML) with mixed host (MH) system using a phosphorescent blue emitter: iridium(III)bis[(4,6-di-fluoropheny)-pyridinato-N,C2]picolinate (Flrpic) doped in N,N'-dicarbazolyl-3,5-benzene (mCP) of hole transport-type host material and 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBi) of electron transport-type host material. This T-EML device resulted in both an effective electron and hole balance and efficient distribution of the recombination zone. As a result, the property of T-EML device which demonstrated a maximum luminous efficiency of 24.45 cd/A and a external quantum efficiency of 10.9%. It also showed a high maximum power efficiency of 13.82 lm/W, which is approximately two times higher than that of the control device.
Dong Hwan
DH
Lim
Seok Jae
SJ
Lee
Hyun Su
HS
Shin
Dong Hyung
DH
Lee
Kum Hee
KH
Lee
Woo Young
WY
Kim
Seung Soo
SS
Yoon
Young Kwan
YK
Kim