Identification of the crystallographic sites of Eu2+ in Ca9NaMg(PO4)7: structure and luminescence properties study

被引：81

作者：

Xia, Zhiguo ^{[1
]}

Liu, Haikun ^{[1
]}

Li, Xia ^{[2
]}

Liu, Chengying ^{[1
]}

机构：

[1] China Univ Geosci, Sch Mat Sci & Technol, Beijing 100083, Peoples R China

[2] Qingdao Univ Sci & Technol, Coll Mat Sci & Engn, Qingdao 266042, Peoples R China

来源：

DALTON TRANSACTIONS | 2013年 / 42卷 / 47期

关键词：

EMITTING PHOSPHOR; CRYSTAL-STRUCTURES; ENERGY-TRANSFER; EMISSION; NA; EFFICIENCY; CALCIUM; LI;

D O I：

10.1039/c3dt52232f

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The substituted activator ions Eu2+ in the beta-Ca-3(PO4)(2)-type structure, Ca9NaMg(PO4)(7) compound, have been studied as emission centers, as well as structural probes. The crystal structure and crystallographic sites of Eu2+ in Ca9NaMg(PO4)(7) have been identified by Rietveld refinements, electron paramagnetic resonance (EPR) spectroscopy analysis and combined photoluminescence spectral analysis, respectively. Ca9NaMg(PO4)(7): Eu2+ phosphor exhibits a broad emission band in the visible light region with three distinguished peaks centered at 415, 458, and 615 nm, which are ascribed to different Eu2+ emission centers occupied in three different Ca crystallographic sites. The concentration quenching behavior, variation in lifetimes and the temperature dependent luminescence properties have been investigated as a function of different emission centers, 415, 458, and 625 nm for Ca9NaMg(PO4)(7): Eu2+ phosphor. Accordingly, the relationship among three different Eu2+ luminescence centers originating from three different Ca2+ crystallographic sites has been found and verified.

引用

页码：16588 / 16595

页数：8

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