Size influence on the fluorescence decay time of ZnS:Mn2+ nanocrystals
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
ZnS:Mn2+ nanocrystals (NCs) with particle size from 1.9 nm to 3.2 nm are synthesized via chemical precipitation method with different [S2−]/[Zn2+] ratios. The size dependent decay for Mn emission exhibits a double exponential behavior. And two lifetime values, in millisecond time domain, can both be shortened with size increasing, which is attributed to enhanced interaction between host and Mn2+ impurity. A molecular structure model is proposed to interpret the tendency of two lifetime components, which is correlated to the number of S vacancy (Vs) defects around Mn2+.
Keywords:
Project Supported:
This work has been supported by the National Natural Science Foundation of China (Nos.60877029, 10904109, 60977035 and 60907021), the Natural Science Foundation of Tianjin (No.09JCYBJC01400), and the Tianjin Key Subject for Materials Physics and Chemistry.
Clc Number:
