Publications
Detailed Information
Polymer based blue electrophosphorescent light emitting devices
Cited 15 time in
Web of Science
Cited 15 time in Scopus
- Authors
- Issue Date
- 2005
- Publisher
- Elsevier
- Citation
- Curr. Appl. Phys. 5 (2005) 309
- Keywords
- Electrophosphorescence ; MLCT ; Blue emission ; Doping
- Abstract
- A series of bis-orthometalated monocyano Ir(III) complexes, [Ir(ppy)2PX3CN], (X=Oph, Ph and n-bu) were synthesized and the influence of the steric and electronic effects of the phosphine ligand on the photophysical and electrochemical properties of complexes were studied. These cyano phosphine complexes emit light from an admixture of triplet metal-to-ligand charge-transfer (3MLCT) and ligand centered (LC) states in the region of 455–498 nm with a vibronic progression. The trends of the photophysical and electrochemical properties of metal complexes in the series were well understood by the electronic parameter of the phosphine ligands. Polymer light emitting devices were fabricated by doping Ir(ppy)2P(n-bu)3CN in the PVK host and the device performances were investigated. The maximum external quantum efficiency (ηex) was 1.45% for a 10 wt% Ir(ppy)2P(n-bu)3CN doped PVK device. A power efficiency of 0.99 lm/W at 230 cd/m2 and 6 mA/cm2 was obtained. The corresponding chloro complexes of the general formula [Ir(ppy)2PX3Cl] were also synthesized and the optical and device properties were compared with the cyano complexes.
- ISSN
- 1567-1739
- Language
- English
- Files in This Item:
- There are no files associated with this item.
Item View & Download Count
Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.