Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (10): 2271-2275.doi: 10.3866/PKU.WHXB201307162

• PHOTOCHEMISTRY AND RADIATION CHEMISTRY • Previous Articles     Next Articles

Preparation and Luminescence Properties of Dy3+-Doped Full-Color Emitting Ca9La(PO4)7 Phosphors

HU Zheng-Fa, MENG Tao, ZHANG Wei, CUI Yue-Peng, LUO Li, WANG Yin-Hai   

  1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, P. R. China
  • Received:2013-05-09 Revised:2013-07-15 Published:2013-09-26
  • Contact: HU Zheng-Fa, ZHANG Wei E-mail:zhfhu@gdut.edu.cn; weizh55@gdut.edu.cn
  • Supported by:

    The project was supported by the Major Science and Technology Project of Guangdong Province, China (2011A080801015), Nanhai Green Lighting Project of Foshan City, China (A201107), and National Natural Science Foundation of China (21271048).

Abstract:

Dy3+-doped Ca9La(PO4)7 phosphors were synthesized by a high-temperature solid-state reaction. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to determine the crystal structure and size of the prepared materials. Photoluminescence excitation and emission spectra of the Dy3+-doped Ca9La(PO4)7:Dy3+ phosphors were measured. The samples exhibited a broad absorption band in the range of 300-460 nmand a series of individual absorption peaks of Dy3+. Blue (481 nm) and yellow (573 nm) emissions combined to generate the observable white-light emission of the Dy3+-doped Ca9La(PO4)7:Dy3+ phosphors with suitable Commission Internationale de L'Eclairage (CIE) chromaticity coordinates around the colorless point (0.313, 0.329) when the phosphors were excited at 350 nm. Concentration quenching was clearly observed as the concentration of Dy3+ dopant was increased. The most intense emission corresponded to a optimummolar fraction of doped Dy3+ ions of 0.05. The mechanismof concentration quenching was dominated by electric dipole?dipole interactions.

Key words: Ca9La(PO4)7:Dy3+, Phosphors, High temperature solid state reaction, Luminescence property, concentration quenching

MSC2000: 

  • O649