Open AccessPreparation and luminescence characteristics of Ca2SiO4:Dy3+ phosphor
Author(s) -
Zhijun Wang,
Panlai Li,
Gang Wang,
Zhaochu Yang,
Qi Guo
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.4575
Subject(s) - phosphor , luminescence , emission intensity , materials science , emission spectrum , intensity (physics) , excitation , analytical chemistry (journal) , charge (physics) , spectral line , atomic physics , optics , optoelectronics , physics , chemistry , chromatography , quantum mechanics , astronomy
The Ca2SiO4:Dy3+ phosphor was synthesized by high temperature solid-state method. The emission spectrum of Ca2SiO4:Dy3+ shows bands at 486nm575nm and 665nm under the 365nm excitation. The excitation spectrum for 575nm emission has excitation bands at 331nm361nm371nm397nm435nm461nm and 478nm. The effect of Dy3+ concentration on the emission spectrum and luminescent intensity of Ca2SiO4:Dy3+ was investigated.The result shows that the ratio (Y/B)of yellow emission (575nm)to blue emission (486nm)increases with increasing Dy3+ concentrationand the reason was explained by Judd-Offelt theory. The luminescent intensity firstly increases with the increasing Dy3+ concentrationthen decreasesand the concentration self-quenching mechanisms are the d-d interaction according to the Dexter theory. The effect of Li+Na+ and K+ on the emission spectra of Ca2SiO4:Dy3+ phosphor was studied. The results show that the emission spectrum intensity of Ca2SiO4:Dy3+ phosphor is greatly influenced by Li+Na+ and K+and the evolvement trend is the same for different charge compensationsi.e.the emission spectrum intensity firstly increases with increasing charge compensation concentrationthen decreases. However, the charge compensation concentration corresponding to the maximum emission intensity is different for different charge compensationsand the concentrations are 44 and 3 mol% for the Li+Na+ and K+respectively.