Open AccessCool white light emission from Dy3+ activated alkaline alumino silicate phosphors
Author(s) -
Shweta Sharma,
Nameeta Brahme,
D. P. Bisen,
Pradeep Dewangan
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.029495
Subject(s) - phosphor , thermoluminescence , materials science , photoluminescence , analytical chemistry (journal) , luminescence , color temperature , optics , scanning electron microscope , spectroscopy , optoelectronics , chemistry , physics , chromatography , quantum mechanics , composite material
A series of single phase white light emitting CaSrAl 2 SiO 7 :Dy 3+ phosphors were prepared by traditional high temperature solid state reaction method. Structural characterization was done by X-ray diffraction, field emission scanning electron microscopy and energy dispersive spectroscopy analyses. Optical characterization was performed from photoluminescence and thermoluminescence studies. When excited at 350 nm, CaSrAl 2 SiO 7 :Dy 3+ phosphors showed two intense emission bands in the blue region (480 nm and 493 nm) corresponding to 4 F 9/2 → 6 H 15/2 transition and one in yellow region (576 nm) corresponding to 4 F 9/2 → 6 H 13/2 transition. The Commission Internationale de I'Eclairage diagram was drawn for entire series. It confirmed that by manipulating Dy 3+ content the luminescence color of CaSrAl 2 SiO 7 :Dy 3+ phosphors were tuned from blue to white region. Computation of correlated color temperature suggested that present phosphor was cool in appearance hence CaSrAl 2 SiO 7 :Dy 3+ phosphor can serve as a white light emitting phosphor and may be useful in outdoor illumination. A detailed study on thermoluminescence of ultraviolet exposed samples was done and possible mechanism of thermoluminescence was discussed. TL emission spectrum was also measured.