| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1237136 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2005 | 6 Pages |
Abstract
In this paper, the low-temperature phosphorescence (LTP), the low-temperature fluorescence (LTF), the paper substrate room-temperature phosphorescence (PS-RTP) and the room fluorescence (RTF) properties of caffeine (CF), theophylline (TP), and theobromine (TB) are investigated and compared, and some rules are found out: their maximal excitation wavelength and emission wavelength are in the range of 270-300Â nm and 395-445Â nm, respectively. And the PS-RTP characters of lifetime, polarization and quanta yield are also investigated and compared. It is found that their lifetimes of PS-RTP are all in the level of 0.1Â s. They belong to long-life phosphorescence and their PS-RTP spectra are incompletely polarized.
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Authors
Yan-Li Wei, Chuan Dong, Shao-Min Shuang, Dian-Sheng Liu,