Highly efficient and stable red phosphorescent organic light-emitting device using bis[2-(2-benzothiazoyl)phenolato]zinc(II) as host material
- 19 March 2007
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 90 (12), 123509
- https://doi.org/10.1063/1.2643908
Abstract
The red-emitting phosphorescent organic light-emitting device employing Bis[2-(2-benzothiazoyl)phenolato]zinc(II) ( Zn ( BTP ) 2 ) as a host material has been demonstrated. The device generates saturated red emission with Commission Internationale de l’Eclairage coordinates of (0.67, 0.33), characterized by a low driving voltage of 3.2 V and high external quantum efficiency of 10.3% at 10 mA ∕ cm 2 . Moreover, the efficiency and lifetime are improved by using 30% NPB-doped Zn ( BTP ) 2 host in the emitting layer, where NPB is 4, 4 ′ -bis( N -phenyl-1-naphthyl-amino)biphenyl. The maximum external quantum efficiency of the device reaches 12.6% at 1.7 mA ∕ cm 2 . The device has exhibited excellent stability. The half-luminance lifetime is 240 h at 80 mA ∕ cm 2 (initial luminance of 6070 cd ∕ m 2 ). The relationship between the employed host material and device performance is discussed.Keywords
This publication has 15 references indexed in Scilit:
- Efficient organic light-emitting devices using an iridium complex as a phosphorescent host and a platinum complex as a red phosphorescent guestApplied Physics Letters, 2006
- Yellow and Red Electrophosphors Based on Linkage Isomers of Phenylisoquinolinyliridium Complexes: Distinct Differences in Photophysical and Electroluminescence PropertiesAdvanced Functional Materials, 2005
- Bright and Efficient, Non‐Doped, Phosphorescent Organic Red‐Light‐Emitting DiodesAdvanced Functional Materials, 2004
- Synthesis of a high-efficiency red phosphorescent emitter for organic light-emitting diodesJournal of Materials Chemistry, 2004
- 23.3: Distinguished Paper: Red-Phosphorescent OLEDs Employing Bis(8-Quinolinolato)-Phenolato-Aluminum(III) Complexes as Emission-Layer HostsSID Symposium Digest of Technical Papers, 2004
- Homoleptic Cyclometalated Iridium Complexes with Highly Efficient Red Phosphorescence and Application to Organic Light-Emitting DiodeJournal of the American Chemical Society, 2003
- High-efficiency red electrophosphorescence devicesApplied Physics Letters, 2001
- Operating lifetime of phosphorescent organic light emitting devicesApplied Physics Letters, 2000
- Improved energy transfer in electrophosphorescent devicesApplied Physics Letters, 1999
- Highly efficient phosphorescent emission from organic electroluminescent devicesNature, 1998