High Efficiency Phosphorescent Organic Light-Emitting Devices with a New Organic Material as the Host of the Emitting Layer
Resource
Proceedings of SPIE 5937: 593722
Journal
Proceedings of SPIE - The International Society for Optical Engineering
Journal Volume
5937
Pages
1 - 6
Date Issued
2005
Date
2005
Author(s)
Abstract
In this paper, we demonstrate a phosphorescent organic light emitting device (PHOLED) with low turn-on voltage by using a n-type organic material as the host of the emitting layer (EML) doped with green emitting complex, fac tris(2-phenylpyridine) iridium Ir(ppy)3. This material exhibits high glass transition temperature (over 200°C) that may help to elongate the operation lifetime. We compare our devices to the classical 4,4'-N,N'-dicarbazole-biphenyl (CBP) based green device. Driving voltage of the CBP and the new-host based OLED is 16 and 11 V with the current density of 100mA/cm2, respectively. The lower driving voltage of the new-host based device comes from the lower HOMO value, i.e. 5.7 eV, which is nearly the same as that of NPB. The current efficiency at 10000 cd/m2 is slightly decreased from 24 to 21 cd/A. However, the power efficiency is increased from 5 to 6 lm/W.
Event(s)
Organic Light-Emitting Materials and Devices IX
Subjects
OLED; Phosphorescent
SDGs
Other Subjects
Current density; Electric potential; Glass transition; Organic compounds; Phosphorescence; Current efficiency; Organic light-emitting devices (OLED); Light emitting diodes
Type
conference paper
File(s)![Thumbnail Image]()
Loading...
Name
25.pdf
Size
312.04 KB
Format
Adobe PDF
Checksum
(MD5):80a9558882f907e90f51c4e65b9a6bde