標題: Triplet exciton energy transfer in polyfluorene doped with heavy metal complexes studied using photoluminescence and photoinduced absorption
作者: Liao, H. H.
Meng, H. F.
Horng, S. F.
Lee, W. S.
Yang, J. M.
Liu, C. C.
Shy, J. T.
Chen, F. C.
Hsu, C. S.
應用化學系
物理研究所
顯示科技研究所
Department of Applied Chemistry
Institute of Physics
Institute of Display
公開日期: 1-Dec-2006
摘要: Modulated photoinduced absorption and photoluminescence are used to study triplet-to-triplet Dexter energy transfer in Ir-complexes/polyfluorene blend systems. There is no Dexter energy transfer for red iridium (III)bis[2-(9,9-dibutylfluorenyl)-1-isoquinoline(acetylacetonate)] (DFIr) and red iridium (III) bis([2-(2-benzo-thienyl)pyridinatoN,C3] acetyl-acetonate) (BtpIr) dopants. Although green iridium(III)tris[2-(4-tolyl)pyridinato-N,C2] [Ir(mppy)(3)] has no triplet confinement in polyfluorene host, it has clear evidence for Dexter energy transfer. Aggregation and dopant lifetime are shown to significantly affect the energy transfer. The presence of Dexter transfer implies the possibility to harvest triplet excitons of polyfluorene in polymer light-emitting diodes even without carrier trapping and triplet exciton confinement.
URI: http://dx.doi.org/10.1103/PhysRevB.74.245211
http://hdl.handle.net/11536/11451
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.74.245211
期刊: PHYSICAL REVIEW B
Volume: 74
Issue: 24
起始頁: 0
結束頁: 0
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