Photochemistry of semiconductor particles I. Optical properties of ZnS sols

A ZnS sol stabilized by polyphosphate was prepared. The particle size is smaller than 3 nm. During the aging and illuminating processes, the change in particle size was followed by the absorption and fluorescence measurement. The mean size of ZnS particles in the solution has a limited value which d...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 1994-05, Vol.79 (3), p.189-195
Main Authors: Zang, Ling, Liu, Chun-Yan, Ren, Xin-Min
Format: Article
Language:English
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Summary:A ZnS sol stabilized by polyphosphate was prepared. The particle size is smaller than 3 nm. During the aging and illuminating processes, the change in particle size was followed by the absorption and fluorescence measurement. The mean size of ZnS particles in the solution has a limited value which did not decrease further owing to the large surface tension. A more reasonable description of the optical processes in ZnS sols has been given. This explains well the disappearance of discernibility of the exciton peak, as well as the band shift of fluorescence which was caused by the surface modification. The effects of such parameters as aging, temperature, illumination and surface condition on the fluorescence intensity of ZnS sols were studied. The luminescence efficiency could be increased by a factor of 5 under the most favorable conditions.
ISSN:1010-6030
1873-2666
DOI:10.1016/1010-6030(93)03760-E