Photoluminescence characterization of Ce super(3+) and Dy super(3+) doped Li sub(2)CaGeO sub(4) phosphors

• Published in: Journal of luminescence Vol. 130; no. 7; pp. 1320 - 1323
• Main Authors: Jian-Xin, Meng, Chuang-Tao, Yang, Qing-Qing, Chen
• Format: Journal Article
• Language: English
• Published: 01.07.2010
• Subjects: Band spectra; Bands; Emission; Luminescence; Phosphors; Photoluminescence; Quenching; Tuning
• ISSN: 0022-2313
• DOI: 10.1016/j.jlumin.2010.02.047

Ce super(3+) and Dy super(3+) activated Li sub(2)CaGeO sub(4) phosphors were prepared by a solid-state reaction method, and characterized by XRD (X-ray diffraction) and photoluminescence techniques. The characteristic emission bands of Dy super(3+) due to super(4)F sub(9/2)--> super(6)H sub(15/2) (blue) and super(4)F sub(9/2)--> super(6)H sub(13/2) (yellow) transitions were detected in the emission spectra of Li sub(2)CaGeO sub(4):Dy super(3+). Ce super(3+) broad band emission was observed in Li sub(2)CaGeO sub(4):Ce super(3+) phosphors at 372 and 400 nm due to 5d-->4f transition when excited at 353 nm. Co-doping of Ce super(3+) enhanced the luminescence of Dy super(3+) significantly and concentration quenching occurs when Dy super(3+) is beyond 0.04 mol%. White-light with different hues can be realized by tuning Dy super(3+) concentration in the phosphors.