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Energy relaxation in CdSe nanocrystals: the effects of morphology and film preparation

Bryan T. Spann, Liangliang Chen, Xiulin Ruan, and Xianfan Xu

Open Access Open Access

Abstract

Ultrafast time-resolved absorption spectroscopy is used to investigate exciton dynamics in CdSe nanocrystal films. The effects of morphology, quantum-dot versus quantum-rod, and preparation of nanocrystals in a thin film form are investigated. The measurements revealed longer intraband exciton relaxation in quantum-rods than in quantum-dots. The slowed relaxation in quantum-rods is due to mitigation of the Auger-relaxation mechanism from elongating the nanocrystal. In addition, the nanocrystal thin film showed long-lived confined acoustic phonons corresponding to the ellipsoidal breathing mode, contrary to others work on colloidal systems of CdSe nanocrystals.

©2012 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 TEM images, XRD, and UV - Vis absorption spectra with scaled second derivative data of CdSe QD(a,b,c) and QR(d,e,f) films.

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Fig. 2
Fig. 2 Transient absorption results (a) for the QD film using a 400 nm pump pulse and various probe wavelengths shown in (b) where the color of the arrows corresponds to the respective TA trace.

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Fig. 3
Fig. 3 Transient absorption results (a) for the QR film using a 400 nm pump pulse and various probe wavelengths shown in (b) where the color of the arrows corresponds to the respective TA trace.

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Fig. 4
Fig. 4 Fourier transform of B1 probes for the QD (a) and QR (b) samples.

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Equations (4)

Equations on this page are rendered with MathJax. Learn more.

L= Kλ βcos(θ)
ρ ∂ 2 u ∂ t 2 =(λ+u)∇div(u)+μ ∇ 2 u
u(r)= p lm L lm (hr)+ q lm N lm (kr)
ω lm = S lm v i /(2a)
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