Growth, structural and optical characterizations of LiLa(1-x)Eux(WO4)2 single-crystalline fibers by the micro-pulling-down method

被引：14

作者：

de Moraes, Jair Ricardo ^{[1
]}

Baldochi, Sonia Licia ^{[1
]}

Leano Soares, Leonardo dos Reis ^{[1
]}

Mazzocchi, Vera Lucia ^{[1
]}

Ramos Parente, Carlos Benedicto ^{[1
]}

Courrol, Lilia Coronato ^{[2
]}

机构：

[1] IPEN CNEN SP, Inst Pesquisas Energet & Nucl, BR-05508000 Sao Paulo, Brazil

[2] Univ Fed Sao Paulo, UNIFESP, Dept Ciencias Exatas & Terra, BR-09972270 Diadema, SP, Brazil

来源：

MATERIALS RESEARCH BULLETIN | 2012年 / 47卷 / 03期

基金：

巴西圣保罗研究基金会;

关键词：

Oxides; Crystal growth; Crystal structure; Luminescence; Optical properties; SPECTROSCOPIC CHARACTERISTICS; LUMINESCENCE PROPERTIES; RARE-EARTH; POLYMORPHISM; TUNGSTATES; MOLYBDATES; RE;

D O I：

10.1016/j.materresbull.2011.12.007

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Transparent and uniform LiLa(1-x)Eux(WO4)(2) single-crystalline fibers where x = 0.005, 0.01, 0.03, 0.05, 0.07, 0.1, 0.15, 0.2, 0.25 and 1.0, with an average of 20-40 mm length were obtained by the micro-pulling-down method aiming structural and optical characterization. The optimum pulling rate was found to depend on the difference between alkali and rare earth ionic radii. Rietveld analysis from X-ray diffraction data and excitation spectroscopy at room temperature were applied to investigate the lattice changes due to the Eu3+ incorporation in the host. LiLa(1-x)Eux(WO4)(2) crystal fibers present red emission due to the electric dipole D-5(0) -> F-7(2) transition under 395 nm excitation showing a concentration quenching around 20 mol% of doping. The excitation spectra of the F-7(0) -> D-5(0) transition show small changes in the Eu3+ surroundings as function of dopant concentration. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：744 / 749

页数：6

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