Photomodification of CdSe nanocrystals incorporated in a poly(butylmethacrylate) polymer film

V. Kovalevskij; V. Gulbinas; G. D. Scholes

doi:10.1063/1.2150264

Photomodification of CdSe nanocrystals incorporated in a poly(butylmethacrylate) polymer film

V. Kovalevskij, V. Gulbinas, G. D. Scholes

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5 Scopus citations

Abstract

We report a study of the influence of high intensity laser light on the optical properties and exciton relaxation dynamics in CdSe nanocrystals passivated by tri- n -octylphosphine oxide and dispersed in the optically clear poly(butylmethacrylate) polymer. Sample irradiation by 3 ps duration laser pulses at 527 nm leads to the blueshift of the maximum of the lowest-energy exciton absorption band and to the disappearance of a long-wavelength absorption slope in the 600-800 nm region that we attribute to Rayleigh scattering. The photomodification rate is approximately proportional to the second to third power of the light intensity and strongly temperature dependent. The shift of the absorption band is related to the reduction of the nanocrystal (NC) size. The disappearance of the Rayleigh scatter is explained as a modification of the NC surface ligands and their immediate surroundings due to an increase in the local temperature.

Original language	English (US)
Article number	014305
Journal	Journal of Applied Physics
Volume	99
Issue number	1
DOIs	https://doi.org/10.1063/1.2150264
State	Published - 2006
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1063/1.2150264

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title = "Photomodification of CdSe nanocrystals incorporated in a poly(butylmethacrylate) polymer film",

abstract = "We report a study of the influence of high intensity laser light on the optical properties and exciton relaxation dynamics in CdSe nanocrystals passivated by tri- n -octylphosphine oxide and dispersed in the optically clear poly(butylmethacrylate) polymer. Sample irradiation by 3 ps duration laser pulses at 527 nm leads to the blueshift of the maximum of the lowest-energy exciton absorption band and to the disappearance of a long-wavelength absorption slope in the 600-800 nm region that we attribute to Rayleigh scattering. The photomodification rate is approximately proportional to the second to third power of the light intensity and strongly temperature dependent. The shift of the absorption band is related to the reduction of the nanocrystal (NC) size. The disappearance of the Rayleigh scatter is explained as a modification of the NC surface ligands and their immediate surroundings due to an increase in the local temperature.",

author = "V. Kovalevskij and V. Gulbinas and Scholes, {G. D.}",

note = "Funding Information: One of the authors (G.D.S.) acknowledges the National Science and Engineering Research Council of Canada and is an Alfred P. Sloan Fellow.",

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T1 - Photomodification of CdSe nanocrystals incorporated in a poly(butylmethacrylate) polymer film

AU - Kovalevskij, V.

AU - Gulbinas, V.

AU - Scholes, G. D.

N1 - Funding Information: One of the authors (G.D.S.) acknowledges the National Science and Engineering Research Council of Canada and is an Alfred P. Sloan Fellow.

PY - 2006

Y1 - 2006

N2 - We report a study of the influence of high intensity laser light on the optical properties and exciton relaxation dynamics in CdSe nanocrystals passivated by tri- n -octylphosphine oxide and dispersed in the optically clear poly(butylmethacrylate) polymer. Sample irradiation by 3 ps duration laser pulses at 527 nm leads to the blueshift of the maximum of the lowest-energy exciton absorption band and to the disappearance of a long-wavelength absorption slope in the 600-800 nm region that we attribute to Rayleigh scattering. The photomodification rate is approximately proportional to the second to third power of the light intensity and strongly temperature dependent. The shift of the absorption band is related to the reduction of the nanocrystal (NC) size. The disappearance of the Rayleigh scatter is explained as a modification of the NC surface ligands and their immediate surroundings due to an increase in the local temperature.

AB - We report a study of the influence of high intensity laser light on the optical properties and exciton relaxation dynamics in CdSe nanocrystals passivated by tri- n -octylphosphine oxide and dispersed in the optically clear poly(butylmethacrylate) polymer. Sample irradiation by 3 ps duration laser pulses at 527 nm leads to the blueshift of the maximum of the lowest-energy exciton absorption band and to the disappearance of a long-wavelength absorption slope in the 600-800 nm region that we attribute to Rayleigh scattering. The photomodification rate is approximately proportional to the second to third power of the light intensity and strongly temperature dependent. The shift of the absorption band is related to the reduction of the nanocrystal (NC) size. The disappearance of the Rayleigh scatter is explained as a modification of the NC surface ligands and their immediate surroundings due to an increase in the local temperature.

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Photomodification of CdSe nanocrystals incorporated in a poly(butylmethacrylate) polymer film

Abstract

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