Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1609465 | Journal of Alloys and Compounds | 2015 | 7 Pages |
Abstract
Ca10Li(PO4)7:Eu2+, Sr2+, Mn2+ (CLP:Eu2+, Sr2+, Mn2+) phosphors were prepared by solid-state reaction method, and their photoluminescence properties were investigated. The phase purity was examined by XRD patterns; the optical bandgaps of the host materials were determined to be about 5.35Â eV from the diffuse reflection spectra. The Eu2+ single-doped CLP exhibits several overlapping emission bands which are derived from various Eu2+ centers, and the excitation spectra are broadened and enhanced gradually with increasing either monitoring wavelength or Eu2+ concentration. When the Sr2+ ions are doped into CLP:Eu2+, the excitation bands are further extended in width and increased in intensity, which make the CLP:Eu2+ more suitable for the LED chips. Correspondingly, the emission spectra show a continuous enhancement for long-wavelength emissions, accompanied by a gradual decay for short-wavelength emissions. These observations could be due to the adjustment of the crystal structure by introducing Sr2+ ions into CLP which further affects the spectral features. In the CLP: Eu2+, Sr2+, Mn2+ system, warm white emission was obtained with low correlated color temperature. In sum, multi-color-emitting CLP:Eu2+, Sr2+, Mn2+ phosphors were developed by adjusting the dopants contents, and the above results indicate their potential applications in LEDs.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Jia Zhang, Zhenghe Hua, Shizheng Wen,