Efficient and Photostable ZnS‐Passivated CdS:Mn Luminescent Nanocrystals
Source abstract
Abstract
Abstract Efficient and photostable ZnS‐passivated CdS:Mn (CdS:Mn/ZnS core/shell) nanocrystals were synthesized using reverse micelle chemistry. CdS:Mn/ZnS core/shell nanocrystals exhibited much improved luminescent properties (quantum yield and photostability) over organically (n‐dodecanethiol‐) capped CdS:Mn nanocrystals. This is the result of effective, robust passivation of CdS surface states by the ZnS shell and consequent suppression of non‐radiative recombination transitions. The dependence of photoluminescence (PL) intensity has been observed as a function of UV irradiation time for both organically and inorganically capped CdS:Mn nanocrystals. Whereas organically capped CdS:Mn nanocrystals exhibit a significant reduction of PL intensity, CdS:Mn/ZnS core/shell nanocrystals exhibit an increased PL intensity with UV irradiation. XPS (X‐ray photoelectron spectroscopy) studies reveal that UV irradiation of CdS:Mn/ZnS nanocrystals in air atmosphere induces the photo‐oxidation of the ZnS shell surface, leading to the formation of ZnSO4. This photo‐oxidation product is presumably responsible for the enhanced PL emission, serving as a passivating layer.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Quantum Dots Synthesis And Properties · Nanocluster Synthesis and Applications · Chalcogenide Semiconductor Thin Films
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (22)
Show source-provided references
1. 10.1021/jp953550610.1021/jp9535506 ↗
2. 10.1016/S1386-9477(00)00129-610.1016/S1386-9477(00)00129-6 ↗
3. 10.1021/j100066a03410.1021/j100066a034 ↗
4. 10.1021/ja970754m10.1021/ja970754m ↗
5. 10.1021/jp953056210.1021/jp9530562 ↗
6. 10.1021/ar970032010.1021/ar9700320 ↗
7. 10.1063/1.47387510.1063/1.473875 ↗
8. 10.1021/j100155a00910.1021/j100155a009 ↗
9. Jin C. · J. Lumin. · 1996 · 66 · 315
10. 10.1021/jp971091y10.1021/jp971091y ↗
11. 10.1016/S1567-1739(01)00012-810.1016/S1567-1739(01)00012-8 ↗
12. 10.1063/1.156330510.1063/1.1563305 ↗
13. C. R. Brundle Encyclopedia of Materials Characterization (Eds: C. R. Brundle C. A. Evans Jr. S. Wilson) Butterworth‐Heinemann Boston1992.
14. C. D. Wagner W. M. Riggs L. E. Davis J. F. Moulder G. E. Mullenberg Handbook of X‐ray Photoelectron Spectroscopy Perkin Elmer Eden Prarie MN1979.
15. 10.1021/ja025946i10.1021/ja025946i ↗
16. Joint Committee on Powder Diffraction Standards (JCPDS) International Center for Diffraction Data (ICDD) Swarthmore PA.
17. 10.1016/S0022-2313(02)00296-X10.1016/S0022-2313(02)00296-X ↗
18. 10.1021/jp010756010.1021/jp0107560 ↗
19. 10.1006/jcis.2000.700910.1006/jcis.2000.7009 ↗
20. 10.1021/jp010757s10.1021/jp010757s ↗
21. 10.1063/1.148311310.1063/1.1483113 ↗
22. National Institute of Standards and Technology (NIST) X‐ray Photoelectron Spectroscopy Database 20 Version 3.3.