Issue 31, 2012
From the journal:

Physical Chemistry Chemical Physics

Growth kinetic on the optical properties of the Pb1−xMnxSe nanocrystals embedded in a glass matrix: thermal annealing and Mn2+ concentration

Sidney A. Lourenço,*a   Noelio O. Dantasb  and  Ricardo S. Silvac  

* Corresponding authors

a Engenharia de Materiais, Universidade Tecnológica Federal do Paraná – UTFPR, CEP 86.812-460, Londrina, PR, Brazil
E-mail: lourenco-sidney@hotmail.com

b Laboratório de Novos Materiais Isolantes e Semicondutores (LNMIS), Instituto de Física, Universidade Federal de Uberlândia, CP 593, Uberlândia, MG, Brazil

c Departamento de Física, Universidade Federal do Triângulo Mineiro, Uberaba, MG, Brazil

Abstract

Semimagnetic Pb1−xMnxSe nanocrystals were synthesized by a fusion method in a glass matrix and characterized by optical absorption (OA), atomic/magnetic force microscopy (AFM/MFM), and photoluminescence techniques. MFM images strongly indicated the formation of Pb1−xMnxSe magnetic phases in the glass system. Quantum dot size was manipulated by tuning annealing time. It was shown that Mn2+ impurity affects nucleation, where Mn2+-doped samples present a redshift of the OA peak after a short annealing time and a blueshift after long annealing time compared to undoped PbSe NCs. This behavior was linked to the dependence of band-gap energy and the absorption selection rule on Mn2+ concentration. Photoluminescence in the Pb1−xMnxSe nanocrystals increases as the temperature rises up to a point and then decreases at higher temperatures. Anomalous increases in emission efficiency were analyzed by considering temperature induced carrier-transfer in semimagnetic Pb1−xMnxSe quantum dots nanocrystals of different sizes.

Graphical abstract: Growth kinetic on the optical properties of the Pb1−xMnxSe nanocrystals embedded in a glass matrix: thermal annealing and Mn2+ concentration

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Article information

DOI
https://doi.org/10.1039/C2CP40850C
Article type
Paper
Submitted
17 Mar 2012
Accepted
31 May 2012
First published
01 Jun 2012

Phys. Chem. Chem. Phys., 2012,14, 11040-11047

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Growth kinetic on the optical properties of the Pb1−xMnxSe nanocrystals embedded in a glass matrix: thermal annealing and Mn2+ concentration

S. A. Lourenço, N. O. Dantas and R. S. Silva, Phys. Chem. Chem. Phys., 2012, 14, 11040 DOI: 10.1039/C2CP40850C

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