Photoluminescence and far-infrared spectroscopy of PbS quantum dots - Polyvinyl alcohol nanocomposite

被引：22

作者：

Kostic, R. ^{[1
]}

Romcevic, M. ^{[1
]}

Romcevic, N. ^{[1
]}

Klopotowski, L. ^{[2
]}

Kossut, J. ^{[2
]}

Kujanin-Jakovjevic, J. ^{[3
]}

Comor, M. I. ^{[3
]}

Nedeljkovic, J. M. ^{[3
]}

机构：

[1] Inst Phys, Belgrade 11080, Serbia

[2] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland

[3] Vinca Inst Nucl Sci, Belgrade 11001, Serbia

来源：

OPTICAL MATERIALS | 2008年 / 30卷 / 07期

关键词：

PbS quantum dots; polyvinyl alcohol; nanocomposite; photoluminescence spectroscopy; far-infrared spectroscopy;

D O I：

10.1016/j.optmat.2007.05.044

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The nanocomposite consisting of PbS quantum dots with average diameter of 26 A and polyvinyl alcohol was characterized using photoluminescence and far-infrared spectroscopy. Photoluminescence spectra of nanocomposite, measured in temperature range from 8 to 280 K, consists of broad peak which spans the energy range from 1.2 to 2.1 eV and can be connected with trap states inside the band gap. Far-infrared measurements are consistent with theoretical calculations that include mechanical boundary conditions at the quantum dot - host interface. Observed peak at 90 cm(-1) can be assigned to coupled modes with l(p) = 1, while broad peak at 275 cm(-1) is above any lattice frequency and is close to sum of the frequencies of the l(p) = 0 acoustic and l(p) = 0 coupled optical mode of PbS quantum dots. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：1177 / 1182

页数：6

共 23 条

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