Enhanced luminescence intensity and color purity of the red emitting LnVO{sub 4}:Eu{sup 3+}@ SiO{sub 2} (Ln = Gd, Y and Gd/Y) powder phosphors
- Centre for Materials for Electronics Technology (C-MET), IDA Phase-III, Cherlapally, Hyderabad 500051 (India)
- Korea Institute of Energy Research (KIER), Daejeon 305-343 (Korea, Republic of)
Graphical abstract: Display Omitted Highlights: ► Tetragonal phase lanthanide vanadates doped with Eu{sup 3+} were synthesized. ► Luminescence enhancement was done by optimizing the host (Gd,Y) and SiO{sub 2} coatings. ► SiO{sub 2} coating was characterized by SEM-EDAX, FT-IR and PL techniques. ► {sup 5}D{sub 0} → {sup 7}F{sub 2} domination over {sup 5}D{sub 0} → {sup 7}F{sub 1} indicates the absence of an inversion symmetry. ► Y{sub 0.95}VO{sub 4}:Eu{sup 3+}@ SiO{sub 2}(10 vol.%) is found to be a novel enhanced red emitting phosphor. -- Abstract: An attempt was made to enhance the luminescence properties of LnVO{sub 4}:Eu{sup 3+}@ SiO{sub 2} (Ln = Gd, Y and Gd/Y) powder phosphors. Pure phase with tetragonal structure of the produced phosphors was confirmed by XRD profiles. Sub-micron sized phosphors have shown 35% more PL intensity than the bulk, which was further improved 20.22% with SiO{sub 2} shell coating. SiO{sub 2} shell coating was optimized by SEM-EDAX, FT-IR, PL and TEM measurements. Emission intensities of the transition, {sup 5}D{sub 0} → {sup 7}F{sub 2} have dominated {sup 5}D{sub 0} → {sup 7}F{sub 1}, which indicated the lowering of an inverse symmetry in the vicinity of Eu{sup 3+} ions. Luminescence intensity and color purity were enhanced with the host modification by substituting Gd{sup 3+} with Y{sup 3+} sites, followed by SiO{sub 2} coating. Based on the systematic investigations carried out, the phosphor Y{sub 0.95}VO{sub 4}:Eu{sup 3+}{sub 0.05}@ SiO{sub 2} is suggested to be a novel contender for its suitable red emission in certain displays or lighting.
- OSTI ID:
- 22215821
- Journal Information:
- Materials Research Bulletin, Vol. 48, Issue 2; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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