Crystallographic and optical features of combustion fabricated green-emitting BaYZn3AlO7:Tb3+ nanophosphor for advanced lighting applications

• Published in: Applied physics. A, Materials science & processing Vol. 128; no. 3
• Main Authors: Kaushik, Shalini, Devi, Suman, Kumar, Mukesh, Dalal, Hina, Sehrawat, Neeraj, Malik, R. K., Srivastava, Anamika, Srivastava, Manish
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-03-2022; Springer Nature B.V
• Subjects: Applied physics; Characterization and Evaluation of Materials; Chromaticity; Color temperature; Combustion synthesis; Condensed Matter Physics; Crystallography; Diffraction patterns; Hexagonal phase; Light sources; Machines; Manufacturing; Materials science; Nanophosphors; Nanotechnology; Optical and Electronic Materials; Physics; Physics and Astronomy; Processes; Quantum efficiency; Spectrum analysis; Surfaces and Interfaces; Thin Films; Ultraviolet radiation; X ray powder diffraction; Nanophosphor; Warm LED; Emanation spectra; Concentration quenching
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-022-05321-6

An efficient, low-energy technique named solution-combustion synthesis was taken into use to generate a sequence of BaY
(1−
x
)
Zn
3
AlO
7
:
x
Tb
3+
(
x
 = 0.01–0.10) nanophosphor. The powder X-ray diffraction patterns braced by Rietveld refinement established the sustenance of BaYZn
3
AlO
7
lattice having hexagonal phase with space group P63mc (186). The most bulging peak in emanation spectra of the nanostructure at 543 nm was due to
5
D
0
 → 
7
F
2
electronic transition resulting in a green emission when excited by a near-UV light source (
λ
max
 = 278 nm). The quantum efficiency for the optimized sample was found out to be 78%. The synthesized nanophosphor with an optimum concentration of Tb
3+
, i.e., BaY
0.95
Tb
0.05
Zn
3
AlO
7
, and the standard host were characterized by DRS (diffuse reflectance spectroscopy), and bandgaps were evaluated which were found to be 4.63eV and 4.67eV respectively. The color coordinates also existed in the greenish section of the chromaticity diagram (
x
 = 0.221 and
y
 = 0.46). The CCT (correlated color temperature) was also evaluated for whole series of nanophosphors and found to be 1714 K for the optimized one that confirmed its applications in warm LED’s fabrication.