A novel single-phase white light emitting phosphor Ca9La(PO4)5(SiO4)F2:Dy3+: synthesis, crystal structure and luminescence properties

Haikun Liu; Libing Liao; Maxim S. Molokeev; Qingfeng Guo; Yuanyuan Zhang; Lefu Mei

doi:10.1039/C5RA23348H

A novel single-phase white light emitting phosphor Ca₉La(PO₄)₅(SiO₄)F₂:Dy³⁺: synthesis, crystal structure and luminescence properties

Haikun Liu,^a Libing Liao,*^a Maxim S. Molokeev,

^bc Qingfeng Guo,^a Yuanyuan Zhang^a and Lefu Mei*^a

Author affiliations

* Corresponding authors

^a Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, China
E-mail: clayl@cugb.edu.cn, mlf@cugb.edu.cn

^b Laboratory of Crystal Physics, Institute of Physics, SB RAS, Krasnoyarsk 660036, Russia

^c Department of Physics, Far Eastern State Transport University, Khabarovsk 680021, Russia

Abstract

A novel single-phase white light emitting phosphor Ca₉La(PO₄)₅(SiO₄)F₂:Dy³⁺ was prepared through traditional high-temperature solid state technology. The crystal structures of Ca₉La(PO₄)₅(SiO₄)F₂ with or without Dy³⁺ ions were refined by the Rietveld method. The diffuse reflection spectra, excitation spectra, emission spectra, and decay times were characterized to investigate the photoluminescence properties for application in white light-emitting diodes. The results showed that the Ca₉La(PO₄)₅(SiO₄)F₂:Dy³⁺ phosphor could efficiently assimilate n-UV light and emit blue (∼485 nm) and yellow light (∼580 nm), originating from the f–f transitions of Dy³⁺. The critical Dy³⁺ quenching concentration (QC) was determined to be about 15 mol%, and the corresponding QC mechanism was verified to be the dipole–dipole interaction. Additionally, the emission colors of all samples were located close to the ideal white light region, and the optimal chromaticity coordinates and correlated color temperature (CCT) were determined to be (x = 0.338, y = 0.336) and 5262 K. All the above results indicate that the as-prepared Ca₉La(PO₄)₅(SiO₄)F₂:Dy³⁺ phosphor could serve as a promising candidate for white-light n-UV-LEDs.

RSC Advances

A novel single-phase white light emitting phosphor Ca₉La(PO₄)₅(SiO₄)F₂:Dy³⁺: synthesis, crystal structure and luminescence properties

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A novel single-phase white light emitting phosphor Ca₉La(PO₄)₅(SiO₄)F₂:Dy³⁺: synthesis, crystal structure and luminescence properties

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