Wavelength down-conversion study of Ba₃Y_1-X (BO₃)₃: x Tb³⁺& Eu³⁺ [0.005 ≤ X ≤ 0.05] phosphor for solid state lighting applications

Abstract

Abstract In this work, we synthesized the Tb 3+ and Eu 3+ doped α-Ba 3 Y(BO 3 ) 3 phosphor using the solution combustion method. Using the powder XRD pattern and FTIR low-temperature phase of α-Ba 3 Y 1-X (BO 3 ): xTb 3+ & Eu 3+ was confirmed. Element composition with percentage was verified by FE-SEM-EDS. Stoke’s shift values were calculated which confirms the high thermal stability of the phosphor& its use in high power WLED. Photoluminescence study at room temperature was done. Intrinsic absorption due to the 4f-4f transition of Eu 3+ results intense red emission from α-Ba 3 Y 1-X (BO 3 ): xEu 3+ makes it suitable for pc-WLED and confirms the Centro-inversion symmetry site of Eu3+ in the host. Green emission at NUV excitation from Ba 3 Y 1-X (BO 3 ): xTb 3+ results from cross-relaxation of Tb 3+ in a host. The concentration quenching reason for both activators was investigated by calculating and comparing critical distance. The purity of luminescence color was confirmed by plotting CIE-chromaticity co-ordinates on CIE-Color gamut. The entire work confirms the importance of synthesized phosphor along with previously reported same host materials. The reported phosphor may be suitable for NUV converted WLED, wavelength conversion devices, and high power RGB –WLED.