Near White Light Emission and Concentration Quenching of Calcium Titanate Doped with Dysprosium (III) Phosphors.

Author(s) Shrivastava, R.
Journal J Fluoresc
Date Published 2019 Mar
Abstract

This paper reports the preparation of CaTiO doped with various concentrations of Dysprosium (II) using solid state reaction technique. X-ray diffraction patterns of the sample were taken. Observed XRD pattern was matched using software match2!. The pattern was matched significantly with the crystallographic open database card (COD - 96-101-1212) which is a standard card for CaTiO. This matching exhibited that, the prepared sample is cubic in structure with space group P m - 3 m (221). Photoluminescence (PL) studies of the samples were also done. PL intensity was found increasing with increasing dopant concentration and maximum intensity was noted at 2.0 mol% concentration of Dy, thereafter concentration quenching occurred. Emission Peaks were centered at 483 nm (F➔H) and 576 nm (F➔H) respectively. For studying the concentration quenching, the critical distance for energy transfer and electric multipolar character were estimated. The value of multipolar character expressed that, the transition in emission spectra is a dipole - dipole (d-d) transition. Commission Internationale de l'Éclairage (CIE) coordinates was found as (0.36, 0.39), which is near to white light. Colour Correlated Temperature (CCT) was 4489 K which was indicative of cool appearance of the light emitted.

DOI 10.1007/s10895-018-02344-2
ISSN 1573-4994
Citation Shrivastava R. Near White Light Emission and Concentration Quenching of Calcium Titanate Doped with Dysprosium (III) Phosphors. J Fluoresc. 2019;29(2):369-374.