標題: Electric Field Effects on Photoluminescence of Polyfluorene Thin Films: Dependence on Excitation Wavelength, Field Strength, and Temperature
作者: Mehata, Mohan Singh
Hsu, Chain-Shu
Lee, Yuan-Pern
Ohta, Nobuhiro
應用化學系
Department of Applied Chemistry
公開日期: 9-七月-2009
摘要: Electroabsorption (E-A) and electrophotoluminescence (E-F) spectra of thin films of blue-light-emitting poly(9,9-dioctylfluorene) (PFO) have been measured at temperatures ranging from 25 to 295 K to examine both the optical property and excitation dynamics of these films in the presence of external electric fields of 0-1.2 MV cm(-1). Electric field effects on excitation dynamics depend on not only applied field strength but also excitation wavelength and temperature. For photoexcitation at 344 or 402 nm, E-F spectra observed with low applied fields show only the Stark shift, whereas fluorescence quenching is induced only by strong electric fields. For photoexcitation at a shorter wavelength of 298 nm, on the other hand, field-induced quenching of fluorescence is observed even with a weak electric field at any temperature. The presence of a nonradiative process from highly excited states that is effectively affected by electric fields is suggested.
URI: http://dx.doi.org/10.1021/jp9023052
http://hdl.handle.net/11536/6975
ISSN: 1932-7447
DOI: 10.1021/jp9023052
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 113
Issue: 27
起始頁: 11907
結束頁: 11915
顯示於類別:期刊論文


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  1. 000267694900065.pdf