Synthesis and optical properties of Mn-doped CaWO4 nanoparticles

被引：9

作者：

Suneeta, P. ^{[1
]}

Kumar, R. Ajay ^{[1
]}

Ramana, M., V ^{[2
]}

Kumar, G. Kiran ^{[3
]}

Chatterjee, Anindita ^{[4
]}

Rajesh, Ch ^{[5
]}

机构：

[1] Koneru Lakshmaiah Educ Fdn, Dept Phys, Adv Funct Mat Lab, Vaddeswaram 522502, Andhra Pradesh, India

[2] SR Govt Arts & Sci Coll, Dept Phys, Kothagudem, Telangana, India

[3] Raghu Engn Coll A, Dept Phys, Visakhapatnam 51162, Andhra Pradesh, India

[4] Raghu Engn Coll A, Dept Chem, Visakhapatnam 531162, Andhra Pradesh, India

[5] Gayatri Vidya Parishad Coll Engn Autonomous, Dept Phys, Visakhapatnam 30048, Andhra Pradesh, India

来源：

PHYSICA SCRIPTA | 2020年 / 95卷 / 03期

关键词：

photoluminescence; hydrothermal method; EPR; THIN-FILMS; LUMINESCENCE; PHOTOLUMINESCENCE;

D O I：

10.1088/1402-4896/ab4d2a

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Pure and Mn-doped calcium tungstate (Mn:CaWO4) nanoparticles (NPs) were synthesized by hydrothermal method which lead to the formation of high quality and narrow sized particles. The concentration of Mn in CaWO4 NPs was varied from 1% to 4% by weight. A distinct peak of Mn (d-d) transition was observed which is actually spin-forbidden but may be allowed due to crystal field effects. Electron spin resonance measurements revealed inclusion of Mn2+ at the substitutional site.. Room temperature photoluminescence emission (PL) and excitation (PLE) spectroscopies were carried out to understand the interactions of sp-d levels. PL spectra revealed the presence of both band-edge (similar to 450 nm) and Mn2+ related orange luminescence (similar to 530 nm). Time dependent photoluminescence (TDPL) studies were also carried out where the life time value of 4.3 ms obtained was in accordance with measurement for Mn in other systems. Thus TDPL further strengths the presence of Mn in 2+ state in CaWO4 NPs.

引用

页数：6

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