Effect of 160 MeV Ni12+ ion irradiation on PbS quantum dots

被引：36

作者：

Chowdhury, S ^{[1
]}

Mohanta, D

Ahmed, GA

Dolui, SK

Avasthi, DK

Choudhury, A

机构：

[1] Tezpur Univ, Dept Phys, Napaam 784028, Assam, India

[2] Tezpur Univ, Dept Chem Sci, Napaam 784028, Assam, India

[3] Ctr Nucl Sci, New Delhi 110067, India

来源：

JOURNAL OF LUMINESCENCE | 2005年 / 114卷 / 02期

关键词：

quantum dots; SHI irradiation; red shift; photoluminescence; UV-vis; XRD;

D O I：

10.1016/j.jlumin.2004.12.006

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

PbS quantum dots of average size 10 nm are encapsulated in a matrix (polyvinyl alcohol (PVA)) following chemical route. They are irradiated with 160 MeV Ni12+ ion beam with fluences 10(12)-10(13) ions/cm(2). Red shift in the absorption response in the optical absorption spectra reveal size enhancement of the quantum dots after irradiation and was confirmed by transmission electron microscopy (TEM). Photoluminescence (PL) study was carried out with excitation wavelength 325nm on both unirradiated and irradiated samples at different fluences and fluence-dependent surface states and excitonic emission is observed in the PL study. The Huang-Rhys coupling constant decreases significantly after swift heavy ion (SHI) irradiation and shows a decreasing trend with increase in ion fluence. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：95 / 100

页数：6

共 26 条

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