Synthesis and photoluminescence characterization of Ce3 +  and Dy3 +  activated ALa(WO4)2(A = Na and Li) novel phosphors

Abstract

In this paper, we report the synthesis of Ce 3+ and Dy 3+ activated alkali lanthanide tungstates, ALa(WO 4) 2 (where A = Na and Li), prepared by solid state reaction method. The prepared phosphors were characterized by X-ray diffraction and photoluminescence techniques. The NaLa(WO 4) 2 :Dy 3+ and LiLa(WO 4) 2 :Dy 3+ phosphors show two emission peaks at around 574 and 486 nm (λ exc = 354 nm). NaLa(WO 4) 2 :Ce 3+ and LiLa(WO 4) 2 :Ce 3+ show two emission peaks at around 378 and 425 nm (λ exc = 350 nm). Excitation wavelengths of Ce 3+ and Dy 3+ activated alkali lanthanide tungstates are in near UV region i.e. Hg free excitation. These characterizations of phosphors are applicable for solid state lighting. Accordingly, Ce 3+ and Dy 3+ activated NaLa(WO 4) 2 and LiLa(WO 4) 2 may be the promising materials for solid state lighting applications.

Novel blue‐emitting SrMg2Al16O27:Eu2+ phosphor for solid‐state lighting

“…The third approach is using near ultraviolet (NUV) or blue LED sources to excite bi‐ or tri‐colour phosphors to generate white light. Recently, we have reported some inorganic phosphors for lamp industry applications, such as silicate , tungstate , vanadates , sulphates , borates , oxides , aluminates , sulphides , halophosphors and phosphates . Generally speaking.…”

A promising Sr5 (PO4)3Br:RE3+ (RE3+= Dy3+, Eu3+, and Tb3+) Phosphors for Near UV Excited White LED and Display Devices

“…The reason for this may be the formation of terbium ions pairs (Tb-Tb) and because of this the excitation energy of the 5 D 3 level relaxes to the 5 D 4 level by cross relaxation. Another possible reason for this may be due to fast relaxation from 5 D 3 level since its lifetime is very small [19]- [21].…”

Controlled synthesis of Gd2(WO4)3 microstructures and their tunable photoluminescent properties after Eu3+/Tb3+ doping

“…Owing to their excellent optical/electromagnetic properties and chemical stability, metal tungstates have shown great potential in various fields ranging from photoluminescence, fluorescent lamps, microwave applications, optical fibers and scintillator materials to X-ray intensified screens. [8][9][10][11][12][13][14][15][16][17][18] Rare-earth tungstates have been shown to be promising host matrixes for the luminescence of lanthanide ions. [10][11][12] Compared to transition metal tungstates, however, rare-earth tungstates have remained largely unexplored in the past years, presumably because they were mainly prepared via solid-state synthetic routes at high temperatures, which preferentially led to mixed phases or compositions.…”

“…[8][9][10][11][12][13][14][15][16][17][18] Rare-earth tungstates have been shown to be promising host matrixes for the luminescence of lanthanide ions. [10][11][12] Compared to transition metal tungstates, however, rare-earth tungstates have remained largely unexplored in the past years, presumably because they were mainly prepared via solid-state synthetic routes at high temperatures, which preferentially led to mixed phases or compositions. [13][14][15][16] Recently, Lin et al developed an intriguing method to prepare Ln 2 (WO 4 ) 3 micro-/nanostructures by combining a sol-gel process with high-temperature calcination.…”