Reddish-orange color tunable Sm3+ activated Gd3Al5O12 phosphors: Crystallographic and photophysical investigation for lighting applications

Reddish-orange color emitting Gd3-xAl5O12:xSm(3 +) (x = 0.01-0.05) nanophosphors has been synthesized via an ideal, economical, less time consuming and urea assisted gel-combustion method. The structural and optical parameters of the synthesized samples were inspected in details. Crystallographic investigations exposed cubic crystal system having space group Ia-3 (d) over bar [230]. The particle size estimated through D. Scherrer's relation (20-32) and Williamson-Hall method (20-44 nm) are in good agreement to each other. The morphological analysis reveals that non-uniform agglomerated almost spherical particles lies in the nano-region (18-35 nm). Under the excitation of 276 nm, emission spectra exhibit three broad-band centered at 566, 602 and 652 nm having transitions (4)G(5/2) -> H-6(J) (J = 5/2 to 9/2). The main reason behind concentration quenching was dipole-quadruple interaction between neighbouring trivalent samarium ions. At last, admirable luminous performance of the optimized sample (x = 0.03) is revealed through CIE chroma coordinates (0.574, 0.390), color temperature value of 1713.66 K and high color purity (89.78%). These excellent results certified the relevancy of the selected nanophosphors as a propitious candidate for the lighting applications. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

Reddish-orange emitting Gd3-xAl5O12:xSm(3 +) (x = 0.01-0.05) nanophosphors were synthesized via a cost-effective and rapid urea-assisted gel-combustion method. The synthesized samples exhibited desirable structural and optical properties. The optimized sample demonstrated excellent luminous performance, making it a promising candidate for lighting applications.