Synthesis and Photoluminescence Studies of an Orange Red Color Emitting novel CaA12O4: Sm3+ nanophosphor for LED Applications

A novel CaAl2O4: Sm3+ (1-9 mol %) was synthesized by solution combustion method by using ODH as a fuel. The final product was well characterized by PXRD, DRS, SEM, TEM and PL. The PXRD profile of CaAl2O4: Sm3+ well matched with JCPDS NO.172155. The average crystallite sizes are found to be in the range 20-40 nm. From Diffuse Reflectance Spectra, the energy gap of the samples were calculated and found to be similar to 2.6 - 3.1 eV. The PL emission peaks centered at similar to 564, 601 and 647 nm may be attributed to 4f-4f ((4) G(5/2) ->(6)) H (J=5/2, 5/ 2,7/2,9/2) G.H= forbidden transitions of Sm3+ ions. The Commission International De IEclairage chromaticity co-ordinates were evaluated from the emission spectra, the values (x = 0.296, y = 0.237) were very close to National Television System Committee standard value of orange red emission. Correlated color temperature was found to be 2780 K. Thus synthesized phosphor was fairly useful for LED's and display applications. (C) 2017 Elsevier Ltd. All rights reserved.