New amorphous hole blocking materials for high efficiency OLEDs.
Two new amorphous molecular materials, 2,5-bis(2',5'-dimethyl-4-triphenylsilyl-phenyl)-[1,3,4]oxadiazole (BDTSO) and 2,5-bis(2',5'-dimethyl-4-triphenylsilyl-phenyl)-[1,3,4]thiadiazole (BDTST) were synthesized and investigated as hole blocking materials (HBM) for organic light-emitting diodes. The efficiency of electroluminescent device was improved by using BDTSO instead of BAlq. The current and power efficiency of the device using BDTSO as HBM is 39.6 cd/A and 13.1 lm/W at 10 mA/cm2, respectively, which is higher compared to the same values for devices using BDTST and BAq which are typically used as HBM.
Jung
Sung Ouk
SO
School of Materials Science and Engineering and ERI, Gyeongsang National University, Jinju, 660-701, Korea.
Park
Jong-Won
JW
Kang
Dong Min
DM
Kim
Jeong-Sik
JS
Park
Sung-Jin
SJ
Kang
Pengtao
P
Oh
Hyoung-Yun
HY
Yang
Jung-Hwan
JH
Kim
Yun-Hi
YH
Kwon
Soon-Ki
SK