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Structural and photoluminescence study of Mn 2+ ‐activated CaYAl 3 O 7 blue phosphors
Author(s) -
Selot Anupam,
Tripathi J.,
Tripathi S.,
Aynyas Mahendra
Publication year - 2014
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.2553
Subject(s) - photoluminescence , phosphor , analytical chemistry (journal) , fourier transform infrared spectroscopy , crystallite , spectroscopy , materials science , diffraction , fourier transform spectroscopy , luminescence , infrared spectroscopy , chemistry , optics , optoelectronics , physics , organic chemistry , chromatography , quantum mechanics , metallurgy
The structural and photoluminescence properties of CaYAl 3 O 7 phosphor material doped with varying concentration of Mn 2+ have been studied. The phosphor material was synthesized by the combustion method at 500 °C and was characterized using X‐ray diffraction, Fourier transform infrared spectroscopy and photoluminescence spectroscopy (PL). X‐ray diffraction showed that the crystallites have average sizes in the range of ~58–70 nm. Corresponding Fourier transform infrared spectroscopy investigations confirm the phase formation and the presence of aluminate group (Al‐O bands) in CaYAl 3 O 7 :Mn 2+ phosphor. Under the excitation at 356 nm wavelength, the PL spectra show the occurrence of two emission peaks obtained in the blue region at 389 nm and 412 nm, which is attributed to the 4 T1(G) → 6A1 transition of Mn 2+ ion. Upon increasing Mn 2+ concentration, the relative PL intensity shows an initial decrement followed by an increase displaying the effect of concentration quenching. Overall the results suggest the possibility of using this material in white lighting devices and plasma display panels. Copyright © 2013 John Wiley & Sons, Ltd.