Intense visible light emission from dysprosium (Dy~(3+)) doped barium titanate (BaTiO_3) phosphor and its thermoluminescence study

摘要

Luminescence behaviour was displayed by dysprosium (Dy~(3+)) doped BaTiO_3 phosphor which was synthesized via solid state reaction method. The method is suitable for large scale production and useful for production of micron size phosphor. The sample was characterized by X-ray diffraction technique and crystallite size was calculated using Scherer’s formula. Effects of optimized concentration of Dy~(3+) on its thermoluminescence glow curve analysis were carried out for γ irradiation. For fixed concentration of dysprosium ions the TL glow curve was recorded using 6.7 °C s~(−1) heating rate. Also for variable γ dose 1-2.5 kGy and optimized concentration of dysprosium ion i.e. 4 mol% were carried out. It is found that TL glow curve shows linear response with γ dose. Kinetic parameters were calculated using computerized glow curve deconvolution technique. Photoluminescence study of Dy~(3+) doped BaTiO_3 phosphor was carried out and it is found that the PL emission spectra in visible region had blue, green and red emission wavelength. CIE coordinate shows color rendering index and correlated color temperature for white light emission of Dy~(3+) doped BaTiO_3 phosphor. It may be used for visible light emission in display device applications and TL dosimetric applications.