Photoluminescence from cadmium sulfide nanoclusters formed in the matrix of a Langmuir-Blodgett film

Bagaev, E. A.; Журавлев, К. С.; Sveshnikova, L. L.; Badmaeva, I. A.; Repinskii, S. M.; Voelskow, M.

doi:10.1134/1.1626217

Cited by 19 publications

(16 citation statements)

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“…Interaction between the two excitons that appear gives rise to a series of nonlinear optical effects, i.e., effects whose intensity depends nonlinearly on the density of the light flux, and many nonlinear optical effects in semiconductor nanoparticles are size-dependent (e.g., see [4,6,17,43,87,93,203,219,251,253,266,271,286,295,297,303,326,327]). …”

Section: The Burstein-moss Effectmentioning

confidence: 99%

Quantum Size Effects in the Photonics of Semiconductor Nanoparticles

et al. 2005

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The appearance of quantum size effects in ultradisperse semiconductors, their quantitative analysis, and their effect on the absorption of light and on the photophysical (vibrational relaxation of photogenerated "hot" charge carriers, band-band and "defect" luminescence) and certain primary photochemical processes (the accumulation of excess negative charge by the semiconductor nanoparticles, interphase electron transfer, etc.) are discussed.

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Section: The Burstein-moss Effectmentioning

confidence: 99%

Quantum Size Effects in the Photonics of Semiconductor Nanoparticles

et al. 2005

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“…At present day CdS nanoclusters formed by the LB method have been mainly studied by structural methods [1][2][3]. Investigation of its optical properties have been limited to optical absorption, Raman scattering and photoluminescence (PL) spectra taken at room temperature [4][5][6][7]. Although the different explanations to the origin of the PL band from CdS nanoclusters have been applied the mechanism of recombination in such structures is still unclear at this moment.…”

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Temperature dependence of photoluminescence from CdS nanoclusters formed in the matrix of Langmuir‐Blodgett film

Bagaev

Журавлев

Sveshnikova

2006

Phys. Status Solidi (c)

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In this paper photoluminescence from CdS nanoclusters formed in the matrix of Langmuir-Blodgett film has been investigated in the temperature range 5-300 K. The photoluminescence spectrum of the nanoclusters at 300 K consists of two bands at 2.9 and 2.1 eV. Temperature dependence of the high-energy band maximum deviates from the dependence of the energy bandgap of bulk CdS. The integrated PL intensity of this band decreases with increasing temperature up to 75 K, grows in a temperature range 150-230 K, and rapidly falls at temperatures higher 230 K. The experimental data have been explained within the framework of a model of recombination of carriers considering carrier transport between CdS nanoclusters. An energy of electron traps and activation energies of nonradiative recombination have been estimated to be about 120, 4 and 100 meV, respectively.

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“…The spectrum of the first sample is dominated by the high energy band with the maxi mum around 460 nm (2.69 eV) and an FWHM of 0.15 eV and features also a weak broad shoulder in the wavelength range of 510-750 nm. The high energy peak originates from the electron transitions between the quantum confinement levels in the QDs [19]. The broad shoulder is composed of three poorly developed bands of different intensities.…”

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“…The charge carrier lifetime in QDs (0.2 μS) would correspond to the time of tunnel ing across a matrix layer with a thickness on the order of 5 nm, taking into account that the matrix material has a band gap of about 4 eV [19] and forms a barrier with a height of about 0.7 eV. However, atomic force microscopy and vacuum tunneling microscopy studies demonstrated that annealing of structures with CdS QDs at 200°C results in complete evaporation of the organic matrix [29].…”

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“…Arrays of vertically oriented CNTs on sin gle crystalline Si(100) substrates were synthesized by chemical decomposition of a toluene/ferrocene reac tive mixture at 820°C as described in [18]. Cadmium sulfide QDs deposited onto CNTs were synthesized by the Langmuir-Blodgett method [19]. In order to pas sivate the surface and increase the PL intensity of the QDs, they were annealed in an ammonia atmosphere at 200°C [20].…”

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Electronic excitation energy transfer between CdS quantum dots and carbon nanotubes

et al. 2012

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The problem of the electronic excitation energy transfer in liquids and solids is among the basic ones in condensed matter physics [1,2]. Understanding of the energy transfer processes is important since they represent the intermediate step between the act of excitation and the process where the electron energy is put to use. The energy transfer can be mediated by quasiparticles or by the electromagnetic field. The lat ter process was first described by Förster [3]. He con sidered the energy transfer caused by weak dipoledipole interaction between the donor and acceptor, the process called fluorescence resonance energy transfer (FRET). Later Dexter [4] generalized Förster's theory for the case of higher multipole and exchange interactions. The further development of the Förster-Dexter theory involved the inclusion of vari ous complicating factors and determination of its validity limits [1].Electron excitation energy transfer in nanostruc tures promising for both fundamental physics and applications is currently of main interest. In nano structures, quasiparticles can tunnel through a poten tial barrier of a finite width separating constituent nanoparticles. This process is actively studied both theoretically and experimentally [5][6][7][8][9]. The Förster-Dexter energy transfer between quantum dots (QDs) was analyzed theoretically in [10] and investigated experimentally in [11][12][13][14][15]. A decrease in the photolu minescence (PL) intensity and an increase in the PL decay rate were observed for the QDs acting as donors, and an increase in the PL intensity was observed for the QDs acting as acceptors. It was shown that the effi ciency of the energy transfer between the QDs can be fairly high, exceeding 50%, and depends on the spac ing between the QDs. When the spacing is larger than about 10 nm, the energy transfer between the QDs no longer takes place.The properties of composite structures consisting of carbon nanotubes (CNTs) and QDs have been actively investigated in recent years. These structures are interesting as a playground for studying novel phys ical phenomena. Furthermore, they will possibly find numerous applications, e.g., in optoelectronics, pho togalvanics, and photovoltaics [16,17]. One of the main topics in the studies of such composite structures is the energy transfer between the two constituents, of which one can act as the donor and the other as the acceptor.Here, we study experimentally the electronic exci tation energy transfer between cadmium sulfide QDs and CNTs.To study energy transfer, samples with CdS QDs deposited onto a CNT layer were fabricated in the fol lowing way. Arrays of vertically oriented CNTs on sin gle crystalline Si(100) substrates were synthesized by chemical decomposition of a toluene/ferrocene reac tive mixture at 820°C as described in [18]. Cadmium sulfide QDs deposited onto CNTs were synthesized by the Langmuir-Blodgett method [19]. In order to pas sivate the surface and increase the PL intensity of the QDs, they were annealed in an ammonia atmosphere at 200°C [...

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Photoluminescence from cadmium sulfide nanoclusters formed in the matrix of a Langmuir-Blodgett film

Cited by 19 publications

References 13 publications

Quantum Size Effects in the Photonics of Semiconductor Nanoparticles

Quantum Size Effects in the Photonics of Semiconductor Nanoparticles

Temperature dependence of photoluminescence from CdS nanoclusters formed in the matrix of Langmuir‐Blodgett film

Electronic excitation energy transfer between CdS quantum dots and carbon nanotubes

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