Combustion synthesis of Eu2 +  and Dy3 +  activated Sr3(VO4)2 phosphor for LEDs

Abstract

Combustion synthesis and photoluminescence (PL) characterization of Sr 3 (VO 4 ) 2 :Eu,Dy phosphors are presented in this paper. PL emission of Sr 3 (VO 4 ) 2 :Eu phosphor shows green broad emission band centring at 511 nm and a red sharp band at 614 nm by excitation wavelength of 342 nm. The PL emission spectrum of Sr 3 (VO 4 ) 2 :Dy phosphor exhibits an intense blue emission peak at 479 nm, yellow broad band centring at 573 nm and red band at 644 nm by the excitation wavelength of 426 nm in near visible blue region. The excitation wavelength of Eu (342 nm) and Dy (426 nm) activated Sr 3 (VO 4 ) 2 phosphor are well matched with the excitation of near UV excited solid state lighting and blue chip excitation of light emitting diodes, respectively. The effect of Eu 2+ and Eu 3+ ions concentration on the emission intensity of Sr 3 (VO 4 ) 2 was also investigated. The Sr 3 (VO 4 ) 2 :Eu is a potential green and red emitting phosphor as well as Sr 3 (VO 4 ) 2 :Dy is blue and yellow emitting phosphor for solid state lighting i.e. white LEDs. The XRD and SEM characteristics of Sr 3 (VO 4 ) 2 materials was also reported in this paper.

Near-infrared spectral downshifting in Sr(3−x)(VO4)2: x Nd3+ phosphor

“…The solid-state reaction method has been the most widely and intensively used method for the preparation of phosphors, including fluorides and oxides, because it is comparatively simple and very suitable for mass production. The mechanism of solid-state reactions is diffusion control reaction and hence repeated grinding and repeated heating are required [30][31][32][33]. Inspired from the above discussion, the present work is planned to study PL properties of Sr 3−x (VO 4 ) 2 :…”

Tunable emission, energy transfer and charge compensation in Sr3(VO4)2:Sm3+,P5+,Na+ phosphor

“…Among them, alkaline earth metal orthovanadates with general formula A 3 (VO 4 near-ultraviolet (UV) [4,5]. The CT band from oxygen to metal is very intense and the energy is transferred to the luminescent centre by a non-radiative mechanism [6]. The VO 4 3À complexion group is tetrahedral symmetry, which is the central V metal ion with coordinated by four O 2À ions [7].…”

Effect of Tm3+ Ions on the White Light Emission of Dy3+–Tm3+ Codoped SrMg2La2W2O12 Phosphors

“…[7][8][9] Many studies have been carried out on Eu 2+ -Dy 3+ codoped phosphors to achieve the better white light emission. [10][11][12] But, the luminescence color strongly depend on Eu 3+ ? Eu 2+ reduction in air and the reduction reaction affects the relative concentrations of Eu 2+ and Eu 3+ ions significantly.…”