Title :
High-efficiency green phosphorescent organic light-emitting devices
Author :
Long, Li ; Shang, Yuzhu ; Lv, Yanfang ; Yu, Jianning ; Wei, Bin ; Li, Chong
Author_Institution :
Sch. of Mater. Sci. & Eng., Shanghai Univ., Shanghai, China
Abstract :
We have developed high efficiency green phosphorescent organic light-emitting devices (OLEDs) using a novel green phosphorescent material. An OLED with a simple structure of ITO/2T-NATA/NPB/TCTA/green dopant x wt% in green host/TPBi/LiF/Al.The optimized dopant concentration was found to be 10 wt%, with which realized a maximum power efficiency of 61.4 lm/W at 11.3 cd/m2. It was further observed that there was reduced current-efficiency roll-off for the used device. At luminance of 100 cd/m2 and 1000 cd/m2, the power efficiencies are 51.2 lm/W and 33.8 lm/W, respectively. In addition, we have obtained a purer green light using this dopant as guest material.
Keywords :
aluminium; brightness; doping; lithium compounds; organic compounds; organic light emitting diodes; phosphorescence; 1,3,5- tris(N-phenylbenzimidazol-2-yl)benzene; 4,4\´,4"-tris-N-naphthyl-N-phenylamino-triphenylamine; 4,40,400-tris(N-carbazolyl)-triphenyl-amine; ITO-LiF-Al; N, N\´-bis- (naphthyl)-N, N\´-diphenyl-l, 1\´-biphenyl-4,4\´-diamine; OLED; current efficiency roll off; dopant concentration; high efficiency green phosphorescent organic light-emitting devices; luminance; power efficiency; Doping; Excitons; Fluorescence; Green products; Materials; Organic light emitting diodes; Performance evaluation; OLEDs; green; high efficiency; phosphorescent; pure emission light;
Conference_Titel :
Electronics and Optoelectronics (ICEOE), 2011 International Conference on
Conference_Location :
Dalian
Print_ISBN :
978-1-61284-275-2
DOI :
10.1109/ICEOE.2011.6013434
