Whitlockite-Type Structure as a Matrix for Optical Materials: Synthesis and Characterization of Novel TM-SM Co-Doped Phosphate Ca9Gd(PO4)7, a Single-Phase White Light Phosphors

Minerals

Ivan V. Nikiforov¹  Dina V. Deyneko¹  Bogdan I. Lazoryak¹  Sergey M. Aksenov²  Dmitry A. Spassky³ 

[1] Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia;Laboratory of Arctic Mineralogy and Material Sciences, Kola Science Centre, Russian Academy of Sciences, 184209 Apatity, Russia;Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 119991 Moscow, Russia;

关键词: phosphates;    luminescence spectroscopy;    whitlockite-type compounds;    energy transfer;    cation distribution;    thulium;   

DOI  :  10.3390/min12010076

来源: DOAJ

【 摘 要 】

A series of novel phosphates with the general formulas Ca₉Gd_0.9−xTm_0.1Sm_x(PO₄)₇ and Ca₉Gd_0.9−yTm_ySm_0.1(PO₄)₇ were synthesized by solid-state method. As-obtained phosphates were characterized by powder X-ray diffraction and second harmonic generation analyses, dielectric measurements, luminescence spectroscopy. All samples were single phase and characterized by the whitlockite-type structure with space group R3c. An influence of admixture concentration of REE³⁺ ions in the initial host on dielectric properties was studied in details. Synthesized phosphates are characterized by intensive luminescence. The emission in the orange region of the visible spectrum is observed for Ca₉Gd_0.9Sm_0.1(PO₄)₇ with a maximum intensity band at 602 nm. The line in blue region at 455 nm, which corresponds to ¹D₂ → ³F₄ Tm³⁺ transition, is registered for Ca₉Gd_0.9Tm_0.1(PO₄)₇. Emission in the white region of CIE coordinates was registered for Tm-Sm co-doped compounds.

【 授权许可】

Unknown