发光
聚苯乙烯
热释光
磷光
发色团
化学
烷基
光化学
掺杂剂
放松(心理学)
光离子化
分析化学(期刊)
聚合物
材料科学
电离
荧光
离子
兴奋剂
有机化学
光电子学
光学
心理学
社会心理学
物理
作者
Hideo Ohkita,Wataru Sakai,Akira Tsuchida,Masahide Yamamoto
出处
期刊:Macromolecules
[American Chemical Society]
日期:1997-09-01
卷期号:30 (18): 5376-5383
被引量:35
摘要
The behavior of a photoejected electron with the parent cation formed through two-photon ionization of a dopant chromophore in poly(alkyl methacrylate)s and polystyrene was studied by measurement of the emission spectra of the charge recombination luminescence, i.e., isothermal luminescence (ITL) at 20 K and thermoluminescence (TL) at temperatures from 20 to 300 K. The ITL spectral shape remained the same between 10 min and 10 h after the photoirradiation. On the other hand, the intensity ratio of phosphorescence (IP) to fluorescence (IF), IP/IF in the TL spectra increased for poly(alkyl methacrylate)s above a temperature where small scale motions of the main chain are released but was almost constant for polystyrene in the temperature range examined. These findings show that, for poly(alkyl methacrylate)s, the photoejected electrons change into more stable anion species with a motional relaxation of the polymer. From the TL spectral change, the depth of the deeper trap at higher temperatures was estimated to be more than 1.8 eV.
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