Effects of oxygen and temperature on phosphorescence and delayed fluorescence of erythrosin B trapped in sol-gel silica

Lam, Sio Kuan, Namdas, Ebinazar and Lo, Dennis (1998) Effects of oxygen and temperature on phosphorescence and delayed fluorescence of erythrosin B trapped in sol-gel silica. Journal of Photochemistry and Photobiology A: Chemistry, 118 1: 25-30.


Author Lam, Sio Kuan
Namdas, Ebinazar
Lo, Dennis
Title Effects of oxygen and temperature on phosphorescence and delayed fluorescence of erythrosin B trapped in sol-gel silica
Journal name Journal of Photochemistry and Photobiology A: Chemistry   Check publisher's open access policy
ISSN 1010-6030
1873-2666
Publication date 1998-10-01
Sub-type Article (original research)
Open Access Status Not Open Access
Volume 118
Issue 1
Start page 25
End page 30
Total pages 6
Place of publication Lausanne, Switzerland
Publisher Elsevier
Language eng
Formatted abstract
Room temperature phosphorescence (RTP) of erythrosin B in sol-gel silica was studied in ambient air, in pure oxygen and in vacuum. Oxygen was found to be an effective quencher of RTP. The phosphorescence and delayed fluorescence data at oxygen pressures higher than 20 mbar can be interpreted by Stern-Volmer diffusional theory. The quenching rate constants of oxygen were determined to be 0.0151 and 0.0111 mbar-1, respectively for phosphorescence and delayed fluorescence. Phosphorescence spectrum at 97°K was measured. More than 2-folds enhancement of phosphorescence intensity was achieved at 97°K. The phosphorescence quantum yields in vacuum were determined as 5.0% and 2.0% at 97°K and at room temperature, respectively.
Keyword Phosphorescence
Erythrosin B
Sol-gel
Oxygen
Temperature
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
 
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Created: Wed, 09 Mar 2011, 23:17:50 EST