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

被引：24

作者：

Lourenco, Sidney A. ^{[1
]}

Dantas, Noelio O. ^{[2
]}

Silva, Ricardo S. ^{[3
]}

机构：

[1] Univ Tecnol Fed Parana UTFPR, BR-86812460 Londrina, PR, Brazil

[2] Univ Fed Uberlandia, Inst Fis, LNMIS, BR-38400902 Uberlandia, MG, Brazil

[3] Univ Fed Triangulo Mineiro, Dept Fis, BR-38025440 Uberaba, MG, Brazil

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2012年 / 14卷 / 31期

关键词：

QUANTUM DOTS; SEMICONDUCTOR NANOCRYSTALS; TEMPERATURE; PBS; EMISSION; GAP;

D O I：

10.1039/c2cp40850c

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：11040 / 11047

页数：8

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