Authors : N. Baig, N. S. Dhoble, K. B. Ghormare and S. J. Dhoble
Page Nos : 329-336
Description :
Abstract:
Photoluminescence study of Na3 Ca2 (SO4)3Cl sulphate phosphor, triggered by rare earth ion Sm3+ is investigated. The phosphor synthesized by cost effective wet chemical method was studied by powdered XRD, SEM and Photoluminescence characterization methods. The average crystallite size calculated by Scherrer formula is found to be 34nm. PL excitation spectra of Na3Ca2(SO4)3Cl :Sm3+ phosphor exhibit narrow bands in the near ultra violet (n-UV) range, and the PL emission spectra of Na3Ca2(SO4)3Cl :Sm3+ phosphor shows narrow bands characteristic of Sm3+ ions in the visible orange region. Under 405nm excitation the emission peaks are obtained at 565nm, 598nm and 645nm can be attributed to the transitions 4G5/2 →6HJ (J=5/2, 7/2 and 9/2) respectively within 4f5 electronic configuration of Sm3+. The calculated color chromaticity CIE coordinates for 1%Sm3+ activator in Na3Ca2(SO4)3Cl host matrix, were (0.323, 0.284) which fall in the white light emission region. This phosphor may be useful for white light emitting phosphors in solid state lighting technology.
Keywords: hotoluminescence, white light, rare earth, wet chemical method
