Facile synthesis and observation of discontinuous red-shift photoluminescence of CdTe/CdS core/shell nanocrystals

Weiwei Xu; Huaibin Shen; Jin Zhong Niu; Changhua Zhou; Cailan Yu; Xiaomin Li; Yuan Hang; Hongzhe Wang; Lan Ma; Lin Song Li

doi:10.1039/c1ce05757j

Facile synthesis and observation of discontinuous red-shift photoluminescence of CdTe/CdS core/shell nanocrystals

Weiwei Xu, Huaibin Shen, Jin Zhong Niu, Changhua Zhou, Cailan Yu, Xiaomin Li, Yuan Hang, Hongzhe Wang, Lan Ma, Lin Song Li

Houston Methodist

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

A simple method was introduced to synthesize CdTe/CdS core/shell nanocrystals (NCs) by using a new kind of "green" tellurium precursor. Both absorption and photoluminescence (PL) spectra of CdTe/CdS NCs exhibited a discontinuous shift as follows: slight (<10 nm), large (∼30 nm), and slight (<10 nm) red-shift during the growth of CdS shell. Different sized CdTe cores were introduced to synthesize CdTe/CdS core/shell NCs and similar discontinuous red-shift phenomena in the PL spectra were observed. These characteristics indicated that the structure of CdTe/CdS NCs gradually evolved from type-I to type-II, in agreement with transmission electron microscopy (TEM), the tuning of PL quantum yields (QYs), and PL lifetime results.

Original language	English (US)
Pages (from-to)	272-277
Number of pages	6
Journal	CrystEngComm
Volume	14
Issue number	1
DOIs	https://doi.org/10.1039/c1ce05757j
State	Published - Jan 7 2012

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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title = "Facile synthesis and observation of discontinuous red-shift photoluminescence of CdTe/CdS core/shell nanocrystals",

abstract = "A simple method was introduced to synthesize CdTe/CdS core/shell nanocrystals (NCs) by using a new kind of {"}green{"} tellurium precursor. Both absorption and photoluminescence (PL) spectra of CdTe/CdS NCs exhibited a discontinuous shift as follows: slight (<10 nm), large (∼30 nm), and slight (<10 nm) red-shift during the growth of CdS shell. Different sized CdTe cores were introduced to synthesize CdTe/CdS core/shell NCs and similar discontinuous red-shift phenomena in the PL spectra were observed. These characteristics indicated that the structure of CdTe/CdS NCs gradually evolved from type-I to type-II, in agreement with transmission electron microscopy (TEM), the tuning of PL quantum yields (QYs), and PL lifetime results.",

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T1 - Facile synthesis and observation of discontinuous red-shift photoluminescence of CdTe/CdS core/shell nanocrystals

AU - Xu, Weiwei

AU - Shen, Huaibin

AU - Niu, Jin Zhong

AU - Zhou, Changhua

AU - Yu, Cailan

AU - Li, Xiaomin

AU - Hang, Yuan

AU - Wang, Hongzhe

AU - Ma, Lan

AU - Li, Lin Song

PY - 2012/1/7

Y1 - 2012/1/7

N2 - A simple method was introduced to synthesize CdTe/CdS core/shell nanocrystals (NCs) by using a new kind of "green" tellurium precursor. Both absorption and photoluminescence (PL) spectra of CdTe/CdS NCs exhibited a discontinuous shift as follows: slight (<10 nm), large (∼30 nm), and slight (<10 nm) red-shift during the growth of CdS shell. Different sized CdTe cores were introduced to synthesize CdTe/CdS core/shell NCs and similar discontinuous red-shift phenomena in the PL spectra were observed. These characteristics indicated that the structure of CdTe/CdS NCs gradually evolved from type-I to type-II, in agreement with transmission electron microscopy (TEM), the tuning of PL quantum yields (QYs), and PL lifetime results.

AB - A simple method was introduced to synthesize CdTe/CdS core/shell nanocrystals (NCs) by using a new kind of "green" tellurium precursor. Both absorption and photoluminescence (PL) spectra of CdTe/CdS NCs exhibited a discontinuous shift as follows: slight (<10 nm), large (∼30 nm), and slight (<10 nm) red-shift during the growth of CdS shell. Different sized CdTe cores were introduced to synthesize CdTe/CdS core/shell NCs and similar discontinuous red-shift phenomena in the PL spectra were observed. These characteristics indicated that the structure of CdTe/CdS NCs gradually evolved from type-I to type-II, in agreement with transmission electron microscopy (TEM), the tuning of PL quantum yields (QYs), and PL lifetime results.

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Facile synthesis and observation of discontinuous red-shift photoluminescence of CdTe/CdS core/shell nanocrystals

Abstract

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