Photoluminescence investigation of CdSe quantum dots and the surface state effect

Mao, Huibing; Chen, Jing; Wang, Jiqing; Li, Zhifeng; Dai, Ning; Zhu, Z. Q.

doi:10.1016/j.physe.2004.10.011

Cited by 43 publications

(23 citation statements)

References 6 publications

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“…It is known to all that the passivation of surface layer plays a vital role in improving the FL efficiency of QDs (3,6,29). Therefore, the changes of the surface situation will greatly affect the FL properties of QDs.…”

Section: The Mechanism Of Reaction Between Thiols and Cdse Qdsmentioning

confidence: 99%

Study on the interaction between 2‐mercaptoethanol, dimercaprol and CdSe quantum dots

et al. 2008

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The interactions between 2-mercaptoethanol, dimercaprol and CdSe quantum dots (QDs) in organic media have been investigated by spectral methods. The results showed that the fluorescence (FL) emission of CdSe QDs gradually decreased, with a slight red-shift, after adding thiols to CdSe QDs solutions. With the increase of the concentrations of thiols, the resonance light scattering (RLS) signal of CdSe QDs had been strongly enhanced in the wavelength range 300-500 nm, which was confirmed by the formation of larger CdSe QDs particles. The effect of thiols on the FL emission of CdSe QDs could be described by a Stern-Volmer-type equation with the concentration ranges 1.0 x 10(-6)-7.5 x 10(-4) mol/L for 2-mercaptoethanol and 1.0 x 10(-7)-2.5 x 10(-5) mol/L for dimercaprol. The possible mechanism of the interaction was proposed according to the results of UV-vis absorption and micro-Raman spectroscopy. The results indicated that FL quenching was mainly attributable to the exchange of the QDs surface molecules.

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Section: The Mechanism Of Reaction Between Thiols and Cdse Qdsmentioning

confidence: 99%

Study on the interaction between 2‐mercaptoethanol, dimercaprol and CdSe quantum dots

et al. 2008

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“…For this range of the quantum dot sizes the authors obtained the values of the FWHM about 115 meV, which appears to be much larger that it is measured in the other experiments [7,8]. The data given in the reference [12] do not allow us so far to see whether the approximate dependence W (d) = λ/d is supported by the measured data. More measurements of the linewidths of the optical features is needed.…”

Section: Numerical Results For Inas and Cdse Quantum Dotsmentioning

confidence: 70%

“…[12] in a range of the quantum dot diameters close to about 6 nm. For this range of the quantum dot sizes the authors obtained the values of the FWHM about 115 meV, which appears to be much larger that it is measured in the other experiments [7,8].…”

Section: Numerical Results For Inas and Cdse Quantum Dotsmentioning

confidence: 94%

Optical Line Width in Quantum Dot or Nanotransistor

Král

Menšı́k

2010

e-J. Surf. Sci. Nanotechnol.

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The width of the spectral line of the optical transitions in quantum dots is studied theoretically on the basis of the electron coupling to the longitudinal optical phonons in polar semiconductors. With using the self-consistent Born approximation to the electronic self-energy, we are able to reproduce one of the main experimental results obtained on CdSe and CuBr quantum dots, namely the linear dependence of the width of the optical line on the inverse of the quantum dot diameter. In addition to it, the theory allows to expect certain resonance features on the linear dependence of line width. Extensions of the present line-width theory may appear suitable in order to reach a better agreement in describing adequately the behavior of the line width in CdSe and InAs quantum dots.

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“…Moreover, FWHM of samples S1 and S2 are larger than 200 meV, which is far larger than that of ordinary bulk semiconductor sample. The main reason of this phenomenon is the size fluctuation of the quantum dots [32]. There is a splitting of the emission maximum observed in sample S3 and this may be due to the recombination through surface defect states.…”

Section: Optical Propertiesmentioning

confidence: 96%

Quantum confinement effect in multilayer structure of alternate CdSe and SiOx insulator matrix thinfilms

Kumar¹,

Devadason²

2013

Superlattices and Microstructures

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Photoluminescence investigation of CdSe quantum dots and the surface state effect

Cited by 43 publications

References 6 publications

Study on the interaction between 2‐mercaptoethanol, dimercaprol and CdSe quantum dots

Study on the interaction between 2‐mercaptoethanol, dimercaprol and CdSe quantum dots

Optical Line Width in Quantum Dot or Nanotransistor

Quantum confinement effect in multilayer structure of alternate CdSe and SiOx insulator matrix thinfilms

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