Portal de Periódicos da CAPES

Preparation, structural and photometric properties of single-phased Gd3Al5O12:Tb3+ green-emitting phosphors for solid state lighting purpose

2022; Elsevier BV; Volume: 288; Linguagem: Inglês

10.1016/j.mseb.2022.116189

1873-4944

Pawan Kumar, Sitender Singh, Isha Gupta, Anuj Dalal, Vinod Kumar, Devender Singh,

Radiation Detection and Scintillator Technologies

Single-phased cool green light emissive Gd3-xAl5O12:xTb3+ (x = 0.01–0.06) nanophosphors have been prepared via less time consuming, ecological, low-temperature based gel-combustion technique and characterized by utilizing X-ray diffraction, morphological observations, FTIR analysis, elemental composition and photoluminescence measurements. Diffraction pattern and Rietveld estimation analysis affirms that all the samples reveal pure cubic phase with space group Ia-3̅d (2 3 0). TEM profile shows the presence of particles with irregular morphology in nano-range. Presence of all the peaks corresponding to the considered elements in the EDX spectrum confirms the elemental purity of the focused nanophosphors. In the excitation spectrum, overlapping of band (8S7/2 → 6IJ) at 274 nm due to Gd3+ ion with 4f8 → 4f75d1 transition of Tb3+ ion suggests the existent of energy transferal between Gd3+ and Tb3+ ions. Upon 274 nm excitation, most intense band obtained at 545 nm (transition; 5D4 → 7F5) which suggests the green emission in the focused nanophosphors. The optimum concentration in the present case is found to be 0.04 and the quenching of concentration is due to the relaxation of energy through dipole-quadrupole interaction between the neighbouring Tb3+ ions. For optimized sample (x = 0.04), chromaticity investigation including high color purity (96.84 %), CIE (x = 0.2871, y = 0.5908) with color temperature 6320.06 K endorses cool green emission from the nanophosphor. These investigations make the focused Gd3Al5O12:Tb3+ nanophosphors potential applicant for solid state lighting applications.