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Structural, optical band gap and photoluminescence studies of chemically capped ( ZnS, ZnS:Mn) nanophosphors

K. S. RATHORE1,* , Y. JANU2, DEEPIKA1, K. SHARMA1, N. S. SAXENA1

Affiliation

  1. Semi-conductor and Polymer Science Laboratory, 5-6, Vigyan Bhawan, Department of Physics, University of Rajasthan, Jaipur-302004 (India), Ph./Fax: +91-141-2704056
  2. Radiation and Solar Devices group, Defence Laboratory, Jodhpur, Rajasthan-342011

Abstract

A wet chemical precipitation method is optimized for the synthesis of ZnS and ZnS:Mn nanocrystals. The nanoparticles were stabilized by capping with EDTA. XRD studies shows the phase singularity of Zns and ZnS:Mn having zinc blende (cubic) structure. XRD line broadening indicate the average crystalline size of undoped is 2.8 nm and for doped ZnS, it is 3 nm. The effect of change in stoichiometry and doping with Mn+2 on the optical band gap and the photoluminescence properties of ZnS nanophosphors have been investigated. Sulphur vacancies (Vs) related emission peak maxima 425 nm has been dominated in undoped ZnS nanoparticles. Emission characteristic of ZnS nano phosphors has been changed with Mn+2 activation due to 4T1-6A1 transition of Mn+2 in ZnS matrix.

Keywords

ZnS, Mn doping, Optical properties, Photoluminescence.

Citation

K. S. RATHORE, Y. JANU, DEEPIKA, K. SHARMA, N. S. SAXENA, Structural, optical band gap and photoluminescence studies of chemically capped ( ZnS, ZnS:Mn) nanophosphors, Optoelectronics and Advanced Materials - Rapid Communications, 3, 4, April 2009, pp.313-316 (2009).

Submitted at: March 25, 2009

Accepted at: April 23, 2009