Synthesis and Luminescence Studies of Tb³⁺ Doped Li₂CaSiO₄ Phosphor for Optical Device Application

A series of Tb-³⁺doped Li₂CaSiO₄ phosphors were prepared by high-temperature solid-state reaction method. The structural studies were done using the X-ray diffraction (XRD) technique. The XRD patterns revealed that the sample was monophased and crystallizes in a cubic structure. Scanning electron microscopy (SEM) was used to obtain information about the morphology of the prepared samples. SEM micrographs clearly indicated that the particles crystallized in inhomogeneous morphology, with the particle size ranging from 1 μm to 100 nm. Also, photoluminescence (PL) analysis of the phosphor samples for different concentrations of doping ions with variable excitations were presented. The PL excitation spectrum of Tb³⁺ iondoped Li₂CaSiO₄ has many sharp peaks, mainly at 418 нм (⁵D₃→⁷F₅), 436 нм (⁵D₃→⁷F₄), 456 нм (⁵D₃→⁷F₃), 472 нм (⁵D₃→⁷F_2,1,0), 487 нм (⁵D₄→⁷F₆), 550 нм (⁵D₄→⁷F₅) and 590 нм (⁵D₄→⁷F₄), assigned to the transitions of Tb³⁺ ion respectively (excited at 237 nm). The 1931 CIE (x, y) chromaticity coordinates showed the distribution of the spectral region calculated from PL emission spectra, and found to be (0.19, 0.22) in a bluish-green region of Tb³⁺ (0.01 wt (in grams)) Li₂CaSiO₄ phosphor. Our study shows that asprepared phosphor may be useful for optical devices, mainly for LEDs, as a bluish-green component.

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