Study for luminescence performance of three methyl xanthine derivatives.
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 270-300 nm and 395-445 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 0.1s. They belong to long-life phosphorescence and their PS-RTP spectra are incompletely polarized.
Wei
Yan-Li
YL
Institute of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, PR China.
Dong
Chuan
C
Shuang
Shao-Min
SM
Liu
Dian-Sheng
DS
D002110:Caffeine / Q000737:chemistry; D005453:Fluorescence; D006863:Hydrogen-Ion Concentration; D008163:Luminescent Measurements; D015394:Molecular Structure; D013050:Spectrometry, Fluorescence; D013696:Temperature; D013805:Theobromine / Q000737:chemistry; D013806:Theophylline / Q000737:chemistry; D014970:Xanthines / Q000737:chemistry*
D014970:Xanthines; C008514:methylxanthine; D002110:Caffeine; D013806:Theophylline; D013805:Theobromine