COMPOSITIONAL EFFECT ON THE OPTICAL ABSORPTION AND PHOTOLUMINESCENCE OF CdSxSe1-x QUANTUM DOTS EMBEDDED IN BOROSILICATE GLASSES

被引：5

作者：

Kumar, Jitender ^{[1
]}

Verma, A. ^{[1
]}

Pandey, P. K. ^{[1
]}

Bhatnagar, P. K. ^{[1
]}

Mathur, P. C. ^{[1
]}

Bhatnagar, M. ^{[2
]}

Liu, W. ^{[3
]}

Tang, S. H. ^{[3
]}

机构：

[1] Univ Delhi, Dept Elect Sci, South Campus,Benito Juarez Rd, New Delhi 21, India

[2] Delhi Univ, Hansraj Coll, Dept Elect, Delhi 110007, India

[3] Natl Univ Singapore, Dept Phys, Singapore 119243, Singapore

来源：

INTERNATIONAL JOURNAL OF NANOSCIENCE | 2009年 / 8卷 / 4-5期

关键词：

Quantum dots; composition; absorption; photoluminescence; red shift;

D O I：

10.1142/S0219581X09006250

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effect of composition on the optical absorption and photoluminescence (PL) spectra of the semiconductor quantum dots (QDs) of CdSxSe1-x embedded in borosilicate glass matrix has been studied. It is observed that the first exciton absorption peak shifts from 2.62 to 2.21 eV and the PL peak shifts from 2.16 to 1.87eV as the composition of selenium increases from 8 to 92wt%. Samples having higher concentration of sulfur are found to have higher PL peak intensity, which is interpreted to be due to high concentration of shallow traps in the sulfur-rich samples. Absorption coefficient goes on increasing as the selenium content increases. This may be attributed to the fact that selenium has higher atomic size as compared to that of sulfur.

引用

页码：403 / 408

页数：6

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