Cool green-emissive Y2Si2O7:Tb3+ nanophosphor: auto-combustion synthesis and structural and photoluminescence characteristics with good thermal stability for lighting applications†
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Date
2024-05
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Abstract
A cheap, versatile, sustainable and energy-efficient gel-combustion method was applied to develop a series
of green-emitting down-converted Y2Si2O7:Tb3+ (YPS:Tb3+) nanophosphors. Employing XRD-based
Rietveld refinement approach, the phase purity and crystallographic evaluation of the produced
phosphor were conducted, revealing a triclinic crystal with P 1 space group. EDX and TEM analyses were
performed on the synthesized samples to determine their elemental composition and morphological
properties. Diffuse reflectance spectra yielded 5.61 eV and 5.79 eV optical energy band gaps for the host
and the optimized (0.04 mole of Tb3+) sample, respectively. UV light has the ability to excite the
nanocrystalline phosphor in an efficient manner, leading to significant luminosity qualities attributed to
the radiative relaxation of 5
D4 / 7
FJ (J = 6, 5, 4, 3). The bi-exponential decay function was derived by
the PL decay curves. With an activation energy of 0.2206 eV, the Y1.96Si2O7:0.04Tb3+ phosphor exhibits
good thermal quenching capabilities. Improved photometric attributes including CIE coordinates, CCT
and color purity confirmed the green glow, indicating a strong competitor for cool-green emission in
lighting applications