Synthesis, characterization and spectroscopic investigation of Cr3+ doped wollastonite nanophosphor

被引：8

作者：

Kumar, M. Madesh ^{[1
,2
]}

Nagabhushana, H. ^{[3
]}

Nagabhushana, B. M. ^{[4
]}

Suriyamurthy, N. ^{[5
]}

Sharma, S. C. ^{[6
]}

Shivakumara, C. ^{[7
]}

Krishna, R. Hari ^{[4
]}

机构：

[1] Jawaharlal Nehru Technol Univ, Anantapur 515002, Andhra Pradesh, India

[2] REVA Inst Technol & Management, Dept Phys, Bangalore 560064, Karnataka, India

[3] Tumkur Univ, CNR Rao Ctr Adv Mat Res, Tumkur 572103, India

[4] MS Ramaiah Inst Technol, Dept Chem, Bangalore 560054, Karnataka, India

[5] Indira Gandhi Ctr Atom Res, Radiol Safety Div, Kalpakkam 603102, Tamil Nadu, India

[6] Chhattisgarh Swamy Vivekananda Tech Univ, Bhilai 490009, Chhattisgarh, India

[7] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2014年 / 128卷

关键词：

Silicates; Nanophosphor; Solution combustion; Photoluminescence; COMBUSTION SYNTHESIS; LUMINESCENCE; FLUORESCENCE; CENTERS; CR-3+; IONS;

D O I：

10.1016/j.saa.2014.02.059

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

This work explores the preparation of nanocrystalline Cr3+ (1-5 mol%) doped CaSiO3 phosphors by solution combustion process and study of its photoluminescence (PL) behavior. The nanopowders are well characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infra-red (FTIR) spectroscopy. PXRD results confirm monoclinic phase upon calcination at 950 degrees C for 3 h. SEM micrographs indicates that the powder is highly porous and agglomerated. The TEM images show the powder to consist of spherical shaped particles of size similar to 30-60 nm. Upon 323 nm excitation, the emission profile of CaSiO3:Cr3+ exhibits a narrow red emission peak at 641 nm due to E-2 -> (4)A(2) transition and broad band at 722 nm due to T-4(2g) -> (4)A(2g). It is observed that PL intensity increases with increase in Cr3+ concentration and highest PL intensity is observed for 3 mol% doped sample. The PL intensity decreases with further increase in Cr3+ doping. This decrease in PL intensity beyond 3 mol% is ascribed to concentration quenching. Racah parameters are calculated to describe the effects of electron-electron repulsion within the crystal lattice. The parameters show 21% reduction in the Racah parameter of free ion and the complex, indicating the moderate nephelauxetic effect in the lattice. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：403 / 407

页数：5

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