Photoluminescence quenching of quantum-confined cadmium sulfide clusters by norbornadiene derivatives
✍ Scribed by Xie Pu-Hui; Wang Xue-Song; Zhang Bao-Wen; Cao Yi
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 419 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0256-7660
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✦ Synopsis
Influence of norbornadiene and its derivatives on the photoluminescence (PL) of quantum-confined cadmium sulfide clusters (Q-CdS) prep& in reverse micelles wm investigated. It was found that norbornadiene-2,3-dicarboxylic acid (3) and its monopotassium salt (4) quenched PL intensity by 77% and 62%, respectively, whereas its dipotassium salt (a), norborngiene (1) and norbornadiene-2,5dimethylcarboxylate ( 2 ) had no effect on PL intensity. The fornation constants for adducts formed between defect sites at the surface of Q-CdS clusters and 3 or 4 were also determined. PL quenching effect was attributed to the presence of ionizable proton which is considered to be able to trap photogenerated electrons and remove them from possible decay process. Measurements of the PL decay by single photon counting technique also supported these steady-state observations.