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Luminescence optimization with superior asymmetric ratio (red/orange) and color purity of MBO₃:Eu³⁺@SiO₂ (M = Y, Gd and Al) nano down-conversion phosphors

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Luminescence optimization with superior asymmetric ratio (red/orange) and color purity of MBO₃:Eu³⁺@SiO₂ (M = Y, Gd and Al) nano down-conversion phosphors

Content Provider	Royal Society of Chemistry (RSC)
Author	Rambabu, U. Han, Sang-Do
Copyright Year	2013
Abstract	Y1−xBO3:Eux3+ (0.07 ≤ x ≤ 0.5 moles) and Y0.7−2x (Gdx, Alx)BO3:Eu3+0.3 (0.05 ≤ x ≤ 0.3 moles) powder phosphors have been synthesized by a novel co-precipitation technique followed by heat treatment. Luminescence optimization was carried out by optimizing the dopant Eu3+ concentration, substitution of Y3+ with Gd3+/Al3+ and finally with SiO2 shell coating. The inversion symmetry of Eu3+ ions were lowered with Eu3+ concentration and substitution of Y3+ with Gd3+/Al3+, respectively. It has been noted that the intensity behavior of PL peaks of Eu3+:5D0 → 7F1, 5D0 → 7F2 are not only sensitive to the inversion symmetry of Eu3+ ions, but also to the monitoring excitation wavelengths. Due to nanosize particle distribution, the optimum activator (Eu3+) concentration (30 mol%) was found to be extremely at higher level, compared to the bulk phosphors. The asymmetric ratio (red/orange) and color purity of the optimized phosphors, Y0.7BO3:Eu0.33+ (with crystallite size, D = 32 nm) and Y0.3Gd0.2Al0.2BO3:Eu3+ (D = 17 nm) were further enhanced with an SiO2 coating. Based on the systematic study, the nanophosphor Y0.7BO3:Eu0.33+@SiO2 with an R/O ratio as 6.710 and color coordinates (x = 0.6612, y = 0.3357) is optimized as a remarkable phosphor having superior features than the commercial, available literature data results.
Starting Page	1368
Ending Page	1379
Page Count	12
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	3
Issue Number	5
Journal	RSC Advances
DOI	10.1039/c2ra21304d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Dopant Crystallite Alx Mathematical optimization Coprecipitation
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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