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P hotoluminescence studies on a new red emitting Sm 3+ doped alkaline earth vanadate phosphor: Ca3Sr3(VO44:Sm3+3+,Na

JIAYUE SUN1,* , RANDI SUN1, JIANFENG SUN1, HAIYAN DU1

Affiliation

  1. College of Chemistry and Environmental Engineering , Beijing Technology and Business University Beijing 1000 48, PR China

Abstract

A series of new red emitting Ca3Sr32x(VO44xSm3+x Na phosphor s w ere synthesized by a solid reaction method XRD phase analysis results indicate that the sample begins to crystallize at 800 º CC, and single phase Ca3Sr3VO44 is fully obtained after annealing at 1000ºC. The as-prepared phosphors ha ve good excitation properties in the region of 350 450 nm, which perfectly match the emission wavelength of near UV light emitting diodes (LEDs). Three characteristic emissions peaking at 563, 601 and 646 nm can be obtained upon 406 nm excitation with the chromaticity coordinates of (0.654 , 321321), which are due to 4G5/2- 6 H 5/2 , 4G5/2-6 H 7/2 and 4G5/2-6 H 9/2 transition s of Sm 3+ ions. Further, the concentration quenching and corresponding luminescence mechanisms of Ca 3 Sr 3 2 x (VO 4 4 : x Sm 3+3+, x Na phosphors were also discussed, and the critical distance was determined to be about 7.75 Å..

Keywords

: Optical materials Phosphors, Whit e LEDs, Optical properties.

Citation

JIAYUE SUN, RANDI SUN, JIANFENG SUN, HAIYAN DU, P hotoluminescence studies on a new red emitting Sm 3+ doped alkaline earth vanadate phosphor: Ca3Sr3(VO44:Sm3+3+,Na, Optoelectronics and Advanced Materials - Rapid Communications, 5, 3, March 2011, pp.215-219 (2011).

Submitted at: Feb. 25, 2010

Accepted at: March 16, 2011