Temperature dependence of electronic energy transfer from a polymer host to a triplet emitter in light emitting diode materials
✍ Scribed by Sang-Hyun Lim; Xiong Gong; Jacek Ostrowski; Guillermo C Bazan; Daniel Moses; Christopher J Bardeen
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 341 KB
- Volume
- 376
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
✦ Synopsis
We investigate the temperature dependence of electronic energy transfer between a polymer host, poly(N-vinylcarbazole) blended with 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole, and the triplet emitter tris[9,9-dihexyl-2-(phenyl-4 0 -(pyridin-2 00 -yl))fluorene] iridium(III) (Ir(DPPF) 3 ). The photophysics of the blend are similar to those of neat poly(N-vinylcarbazole), with two emitting species corresponding to shallow and deep excimer traps. When the blend is doped with Ir(DPPF) 3 , the deep trap emission is preferentially quenched. This quenching cannot be explained by simple F€ o orster energy transfer to the dopant. Instead, the data are consistent with a rapid, temperature-dependent partitioning of the energy between the two host species and the Ir(DPPF) 3 , each of which decays independently.