Wavelength dependence of laser-induced phase transformations in semiconductor quantum dots

M Gajdardziska-Josifovska; J Reynolds; VV Yakovlev; Vlado Lazarov

Wavelength dependence of laser-induced phase transformations in semiconductor quantum dots

M Gajdardziska-Josifovska^*, J Reynolds, VV Yakovlev, Vlado Lazarov

^*Corresponding author for this work

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

Abstract

We study the effect of wavelength on the laser-induced phase transformation in semiconductor quantum dots. In our earlier report [Yakovlev , Appl. Phys. Lett. 76, 2050 (2000)], we discovered that a nanosecond pulse of 532 nm radiation results in a phase transformation of CdS nanocrystals from an orthorhombic to cubic phase. In this study, we find that irradiation with the pulse of a different wavelength (355 nm) results in a completely different transformation to a hexagonal wurtzite phase and a significant broadening of nanocrystal size distribution. The nanocrystal stoichiometry remained unchanged by the laser irradiation, as verified by energy dispersive x-ray spectroscopy. (C) 2001 American Institute of Physics.

Original language	English
Pages (from-to)	3298-3300
Number of pages	3
Journal	Applied Physics Letters
Volume	78
Issue number	21
Publication status	Published - 21 May 2001

Keywords

POLYMERS
ULTRAFAST
CDSE NANOPARTICLES
NONLINEAR-OPTICAL PROPERTIES
SIZE
NANOCRYSTALS
NANOCLUSTERS

Cite this

@article{8c0dd047120747eb8aadb313b13ba89c,

title = "Wavelength dependence of laser-induced phase transformations in semiconductor quantum dots",

abstract = "We study the effect of wavelength on the laser-induced phase transformation in semiconductor quantum dots. In our earlier report [Yakovlev , Appl. Phys. Lett. 76, 2050 (2000)], we discovered that a nanosecond pulse of 532 nm radiation results in a phase transformation of CdS nanocrystals from an orthorhombic to cubic phase. In this study, we find that irradiation with the pulse of a different wavelength (355 nm) results in a completely different transformation to a hexagonal wurtzite phase and a significant broadening of nanocrystal size distribution. The nanocrystal stoichiometry remained unchanged by the laser irradiation, as verified by energy dispersive x-ray spectroscopy. (C) 2001 American Institute of Physics.",

keywords = "POLYMERS, ULTRAFAST, CDSE NANOPARTICLES, NONLINEAR-OPTICAL PROPERTIES, SIZE, NANOCRYSTALS, NANOCLUSTERS",

author = "M Gajdardziska-Josifovska and J Reynolds and VV Yakovlev and Vlado Lazarov",

year = "2001",

month = may,

day = "21",

language = "English",

volume = "78",

pages = "3298--3300",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "21",

}

TY - JOUR

T1 - Wavelength dependence of laser-induced phase transformations in semiconductor quantum dots

AU - Gajdardziska-Josifovska, M

AU - Reynolds, J

AU - Yakovlev, VV

AU - Lazarov, Vlado

PY - 2001/5/21

Y1 - 2001/5/21

N2 - We study the effect of wavelength on the laser-induced phase transformation in semiconductor quantum dots. In our earlier report [Yakovlev , Appl. Phys. Lett. 76, 2050 (2000)], we discovered that a nanosecond pulse of 532 nm radiation results in a phase transformation of CdS nanocrystals from an orthorhombic to cubic phase. In this study, we find that irradiation with the pulse of a different wavelength (355 nm) results in a completely different transformation to a hexagonal wurtzite phase and a significant broadening of nanocrystal size distribution. The nanocrystal stoichiometry remained unchanged by the laser irradiation, as verified by energy dispersive x-ray spectroscopy. (C) 2001 American Institute of Physics.

AB - We study the effect of wavelength on the laser-induced phase transformation in semiconductor quantum dots. In our earlier report [Yakovlev , Appl. Phys. Lett. 76, 2050 (2000)], we discovered that a nanosecond pulse of 532 nm radiation results in a phase transformation of CdS nanocrystals from an orthorhombic to cubic phase. In this study, we find that irradiation with the pulse of a different wavelength (355 nm) results in a completely different transformation to a hexagonal wurtzite phase and a significant broadening of nanocrystal size distribution. The nanocrystal stoichiometry remained unchanged by the laser irradiation, as verified by energy dispersive x-ray spectroscopy. (C) 2001 American Institute of Physics.

KW - POLYMERS

KW - ULTRAFAST

KW - CDSE NANOPARTICLES

KW - NONLINEAR-OPTICAL PROPERTIES

KW - SIZE

KW - NANOCRYSTALS

KW - NANOCLUSTERS

M3 - Article

SN - 0003-6951

VL - 78

SP - 3298

EP - 3300

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 21

ER -