Structural analysis and Judd-Ofelt parameterization of Ca9Gd(PO4)7: Eu3+ nanophosphor for solid-state illumination

被引：49

作者：

Dalal, Jyoti ^{[1
]}

Dalal, Mandeep ^{[1
]}

Devi, Sushma ^{[1
]}

Devi, Rekha ^{[1
]}

Hooda, Anju ^{[1
]}

Khatkar, Avni ^{[2
]}

Taxak, V. B. ^{[1
]}

Khatkar, S. P. ^{[1
]}

机构：

[1] Maharshi Dayanand Univ, Dept Chem, Rohtak 124001, Haryana, India

[2] Maharshi Dayanand Univ, Dept Elect & Commun UIET, Rohtak 124001, Haryana, India

来源：

JOURNAL OF LUMINESCENCE | 2019年 / 210卷

关键词：

Rietveld refinement; Radiative lifetime; Judd-Ofelt parameters; Stimulated emission cross section; Energy transfer critical distance; Quantum efficiency; CRYSTAL-STRUCTURE; OPTICAL-PROPERTIES; EMITTING PHOSPHOR; ENERGY-TRANSFER; PHOTOLUMINESCENCE PROPERTIES; LUMINESCENCE PROPERTIES; DEPENDENT LUMINESCENCE; TUNABLE PHOSPHOR; RED PHOSPHOR; LIGHT;

D O I：

10.1016/j.jlumin.2019.02.050

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

High-brightness, red-emitting Ca9Gd1-x(PO4)(7): xEu(3+) phosphors were developed via the facile route of solution-combustion. The Rietveld-assisted structural analysis of Ca9Gd(PO4)(7) and Ca9Gd0.40Eu0.60(PO4)(7) systems unveiled a trigonal crystal system having R3c(161) space-group symmetry. The absence of JCPDS data was compensated by simulating one from refined structural prototype. The band-gap for the host and best luminescent composition were determined to be 4.55 and 4.01 eV, respectively. The ratio of Judd-Ofelt parameters inferred a very high asymmetry around activator ion which can further be enhanced as a function of dopant concentration. The refractive index of Ca9Gd(PO4)(7) was determined to be 2.34. The value of stimulated emission cross section, total radiative transition rate and non-radiative transition rate for Ca9Gd0.40Eu0.60(PO4)(7) are calculated from detailed photo-luminescent (PL) analysis. Furthermore, very high value of quantum efficiency (98.13%) and radiative lifetime (1.85 ms) suggested that Ca9Gd0.40Eu0.60(PO4)(7) nanophosphor have practical applicability in PC-WLEDs (components of solid-state lighting).

引用

页码：293 / 302

页数：10

共 51 条

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