Effect of Eu 3+ Concentration on Luminescence Studies of Y 4 Al 2 O 9 Phosphor

Abstract

The present paper reports the effect of europium concentration on photoluminescence (PL) and thermoluminescence (TL) studies of Eu 3+ doped Y 4 Al 2 O 9 phosphor using inorganic materials like yttrium oxide (Y 2 O 3 ), aluminium oxide (Al 2 O 3 ), boric acid (H 3 BO 3 ) as a flux, and europium oxide (Eu 2 O 3 ). The sample was prepared by the modified solid state reaction method, which is the most suitable for large-scale production. The prepared phosphor sample was characterized using X-ray diffraction (XRD), field emission gun scanning electron microscopy (FEGSEM), Fourier transform infrared spectroscopy (FTIR), photoluminescence (PL), thermoluminescence (TL), and CIE techniques. The PL emission was observed in the range of 467, 535, 591, 611, 625, and 629 nm for the Y 4 Al 2 O 9 phosphor doped with Eu 3+ (0.1 mol% to 2.5 mol%). Excitation spectrum was found at 237 and 268 nm. Sharp peaks were found around 591, 611, and 625 nm with high intensity. From the XRD data, using Scherer’s formula, the calculated average crystallite size of Eu 3+ doped Y 4 Al 2 O 9 the phosphor is around 55 nm. Thermoluminescence study was carried out for the phosphor with UV irradiation. The present phosphor can act as single host for red light emission in display devices.