Preparation and Photoluminescence Properties of Novel Color-Tunable MgY4Si3O13:Ce3+, Tb3+ Phosphors for Ultraviolet Light-Emitting Diodes
Oxide-based phosphors MgY4Si3O13 codoped with Ce3+ and Tb3+ were prepared in this study. Broad Ce3+ excitation spectra with the highest intensity at 330 nm were found for MgY4Si3O13:Ce3+, Tb3+ phosphors. Emission lines ranging from 450 to 650 nm originated from the 5D4→7FJ (J=6, 5, 4, 3) transitions of Tb3+ ions. The energy transfer from Ce3+ to Tb3+ occurred effectively in MgY4Si3O13:Ce3+, Tb3+ with a dipole–quadrupole interaction. Codoping Ce3+ with Tb3+ significantly increased the emission intensity of the prepared phosphors. Increasing the Tb3+ concentration led to the chromaticity coordinates of the prepared samples greatly shifting from the blue to the green region, extending the applicability of MgY4Si3O13:Ce3+, Tb3+ phosphors in solid-state lighting.
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Document Type: Research Article
Affiliations: Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan, ROC
Publication date: 01 July 2010