Bishnoi, Swati and Swati, G. and Singh, Paramjeet and Jaiswal, V. V. and Sahu, Mukesh K. and Gupta, Vinay and Vijayan, N. and Haranath, D. (2017) Appearance of efficient luminescence energy transfer in doped orthovanadate nanocrystals. Journal of Applied Crystallography, 50. pp. 787-794. ISSN 1600-5767
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Abstract
This paper reports the detailed synthesis mechanism and the structural, morphological and optical characterization of ultraviolet (similar to 311 nm) excitable samarium doped gadolinium yttrium orthovanadate, (Gd,Y)VO4:Sm3+, nanocrystals. X-ray diffraction and Rietveld refinement studies confirmed that the synthesized samples crystallize in a tetragonal structure with I41/amd space group. The enhanced photoluminescence intensity of (Gd, Y)VO4:Sm3+ compared with the existing YVO4:Sm3+ phosphor clearly indicates the significant role of Gd3+ ions. This has been attributed to the sensitization of the P-6(J) energy level of Gd3+ ions by energy transfer from orthovanadate (VO43-) ions and subsequent energy trapping by Sm3+ ions. The energy transfer from VO43 to Gd3+ via Gd3+ ions as intermediates and concentration quenching of Gd3+ luminescence are discussed in detail. The optical band gap of the as-prepared nanocrystals has been estimated using UV-vis-NIR absorption spectroscopy, which reveals a slightly higher band gap (3.75 eV) for YVO4 as compared to GdYVO4 (3.50 eV). Furthermore, confocal microcopy, decay parameters and Commission Internationale de l'Eclairage chromatic coordinates have supplemented these studies, which established the suitability of these nanophosphors for achieving spectral conversion in silicon solar cells.
| Item Type: | Article |
|---|---|
| Additional Information: | Copyright for this article belongs to M/s International Union of Crystallography. |
| Subjects: | Chemistry Crystallography |
| Divisions: | UNSPECIFIED |
| Depositing User: | Users 27 not found. |
| Date Deposited: | 20 Aug 2018 08:20 |
| Last Modified: | 20 Aug 2018 08:20 |
| URI: | http://npl.csircentral.net/id/eprint/2616 |
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