Preparation and thermally stable luminescence properties of a new blue Sr5Cl0.75F0.25(PO4)(3): Eu2+ phosphor for WLEDs

作者：Wu, Zhan-Chao^*; Wang, Shuai; Liu, Jie; Yin, Jin-Hua; Kuang, Shao-Ping

来源：Journal of Alloys and Compounds, 2015, 644: 274-279.

DOI：10.1016/j.jallcom.2015.04.124

• WLED
• Thermally stable luminescence
• Phosphor
• Phosphate

A series of new blue-emitting phosphors Sr5(1-x)Cl0.75F0.25(PO4)(3): 5xEu(2+) (x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 mol%) were synthesized by high-temperature solid state reaction. X-ray powder diffraction (XRD) and field-emission scanning electron microscope (FE-SEM) were used to characterize the crystal structure and micro-morphology of the prepared samples. The photoluminescence properties of these phosphors were investigated by excitation and emission spectra. The effect of Eu2+ concentration on emission of the phosphor was investigated and the concentration quenching mechanism was discussed in detail. Also, the temperature-dependence luminescence properties of Sr5Cl0.75F0.25(PO4)(3): Eu2+ were compared with those of the commercial blue phosphor BaMgAl10O17: Eu2+ (BAM). With the increase of temperature, the emission band exhibited blue shift and decreasing emission intensities. The phosphor Sr5Cl0.75F0.25(PO4)(3): Eu2+ possesses higher thermal stability than BAM. Furthetmore, a bright blue LED was fabricated by combination of n-UV InGaN chip and the phosphor. The results reveal that Sr5Cl0.75F0.25(PO4)(3): Eu2+ is a potential blue phosphor for n-UV-pumped white light-emitting-diodes (WLEDs).

• 出版日期2015-9-25
• 单位青岛科技大学