Intense green light emission and TL glow curve analysis of Tb 3+ activated CaY 2 O 4 phosphor.

Herein, the synthesis & luminescence analysis of Tb 3+ activated phosphor were reported. The CaY 2 O 4 phosphors were synthesized by a modified solid-state reaction method with a variable doping concentration of Tb 3+ ion (0.1-2.5 mol%). As synthesized, phosphor was characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analysis technique for optimized concentration of doping ions. The prepared phosphor shows a cubic structure, and FTIR analysis confirmed functional group analysis. It was discovered that the intensity of 1.5 mol% is high compared to other concentrations after the photoluminescence excitation and emission spectra were recorded for different concentrations of doping ions. The excitation was monitored at 542 nm, and the emission was monitored at 237 nm. At 237 nm excitation, the emission peaks were found at 620 nm ( 5 D 4 → 7 F 3 ), 582 nm ( 5 D 4 → 7 F 4 ), 542 nm ( 5 D 4 → 7 F 5 ), and 484 nm ( 5 D 4 → 7 F 6 ). The 1931 CIE (x, y) chromaticity coordinates show the distribution of the spectral region calculated from PL emission spectra. The value of (x = 0.34 and y = 0.60) was very close to dark green emission. Therefore, the produced phosphor is very useful for light-emitting diodes (green component) applications. The TL glow curve analysis for various concentrations of doping ions and various UV exposure times was recorded, and a single broad peak was found at 252 o C; The computerised glow curve deconvolution (CGCD) method was used to get the related kinetic parameters. In order to be useful for UV ray dosimetry, prepared phosphor exhibits an excellent response to UV dose.