Quantum-size stark effect in semiconductor microcrystals

Ekinov, A.I.; Éfros, Al. L.; Shubina, T. V.; Скворцов, А. А.

doi:10.1016/0022-2313(90)90011-y

Cited by 55 publications

(33 citation statements)

References 4 publications

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“…This occurs because a carrier inside the crystalline occupy one of the confined electronic states, which increase in energy with decreasing nanocrystal size [4]. Below a critical radius, the confinement energy exceeds the Coulomb interaction between the ionized impurity and the carrier [5], which then automatically occupies a nanocrystal state.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Rare Earth Ion Doped Nano ZnO

John

Rajakumari²

2012

Nano-Micro Lett.

123

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Rare Earth Ion Doped Nano ZnO

John

Rajakumari²

2012

Nano-Micro Lett.

123

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“…The integrated intensity of photoluminescence depends analogously on the external electric field strength E for both nanocrystals and nanorods. The photoluminescence band maximum for the nanocrystals is shifted in proportion to E 2 , which corresponds to the quantum-confined Stark effect in the nanocrystals [1,3,[14][15][16], and for the nanorods it is shifted linearly, in proportion to E (linear effect) and also less effectively.…”

Section: Introductionmentioning

confidence: 97%

“…We see that decay of the photoluminescence of nanocrystals and nanorods occurs in the same time range, has pronounced non-monoexponential character, and exhibits a weak dependence on the magnitude of the external field. In order to establish the quantitative difference in the photoluminescence decay kinetics for nanocrystals and nanorods, it is sufficient to analyze the nanosecond range of decay times, in which (as shown earlier in [16]), there are characteristic differences. For a more exact estimate of the change in the photoluminescence decay rate for the nanoparticles, we used an approximation of the kinetics by a multiexponential function Table 1 gives the average photoluminescence decay time, determined from the formula…”

Section: Introductionmentioning

confidence: 99%

Effect of an electric field on photoluminescence of cadmium selenide nanocrystals

et al. 2010

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We have demonstrated a difference in the nature of the effect of a strong external electric field (>10 5 V/cm) on the photoluminescence of cadmium selenide nanoparticles of different shapes. We have determined a correlation between the magnitude of the external electric field and the average photoluminescence decay time for two types of nanoparticles: "quantum dots" and nanorods. We discuss the mechanism for the effect of an electric field on the photoluminescence of both types of nanoparticles.Keywords: "quantum dots", nanorods, cadmium selenide, kinetics of photoluminescence, polarization, electric field, Stark effect. Introduction.Optoelectronic devices designed on the basis of nanostructures that are controllable by an external electric field and that contain quantum-confined semiconductor nanoparticles allow for full integration of the optical component and conventional semiconductor microelectronics components. Effective control of the optical absorption and luminescence of such structures using an external electric field, as predicted by theory, can be fully realized in structures such as "quantum dots" [1, 2]. Chemically synthesized semiconductor nanocrystals, as representatives of this type of structure, also exhibit a dependence of the optical properties on the magnitude of the external field (the quantum-confined Stark effect for absorption [3], and also the Stark shift and quenching of luminescence on emission of light [4]). Luminophores based on such nanostructures in combination with blue light-emitting diodes are of special practical interest for designing economical sources of white light [5]. In contrast to "quantum dots" (called nanocrystals in the following),ànanorods have quantum confinement only in two spatial dimensions, which is why there is a difference in the manifestation of the effect of an external electric field and polarization selectivity of the optical properties relative to the field vector.Using an external electric field to control photoluminescence (PL) of semiconductor nanocrystals and nanorods requires detailed study of the spectral and kinetic characteristics of such structures as a function of the magnitude of the applied external electric field. The structures best studied to date are based on cadmium selenide compounds. However, the specific details of the mechanisms for radiative and nonradiative recombination in nanorods in the presence of a strong external electric field have not been fully identified. In particular, the difference in the mechanisms for quenching of photoluminescence for nanorods and nanocrystals, and also the effect of the orientation of nanorods relative to the external field on their photoluminescence kinetics, still remain insufficiently studied. Study of quenching of photoluminescence for single nanorods in an external electric field also has not provided a clear answer to the question concerning the possible mechanism of action for the field on radiative recombination of electron×donor pairs in nanoparticles [6][7][8][9][10].The aim of this work ...

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“…The Spatial confinement of the carriers motion in the semiconductor nanocrystals results in dramatic transformation of their zone structure, as well as the dynamicS of excited states. There is a number of papers on the influence of external electric field on the linear and nonlinear absorption spectra of the direct-gap semiconductor nanocrystals in various matrices [4][5][6]. The development of quantum-confined Stark effect (QCSE) was observed in many experiments [1,[4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…There is a number of papers on the influence of external electric field on the linear and nonlinear absorption spectra of the direct-gap semiconductor nanocrystals in various matrices [4][5][6]. The development of quantum-confined Stark effect (QCSE) was observed in many experiments [1,[4][5][6]. The investigation of high electric field influence on the absorption spectra of the quantum-sized (QS) nanocrystals gives the information about the field-induced perturbations in the energetic levels of nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

Luminescence Spectra of Quantum-Sized CdS and PbI₂Particles in Static Electric Field

1995

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The influence of external electric field was studied on the luminescence behavior of quantum-sized CdS and PbI2 nanocrystals, embedded in various polymeric films. The clear increase in the photoluminescence intensity from the quantum-sized particles was observed, as well as the spectral shift of photoluminescence bands. The mechanism proposed is based on the field-induced oxygen desorption from the nanocrystal surface which is the good photoluminescence inhibitor.

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Quantum-size stark effect in semiconductor microcrystals

Cited by 55 publications

References 4 publications

Synthesis and Characterization of Rare Earth Ion Doped Nano ZnO

Synthesis and Characterization of Rare Earth Ion Doped Nano ZnO

Effect of an electric field on photoluminescence of cadmium selenide nanocrystals

Luminescence Spectra of Quantum-Sized CdS and PbI₂Particles in Static Electric Field

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Quantum-size stark effect in semiconductor microcrystals

Cited by 55 publications

References 4 publications

Synthesis and Characterization of Rare Earth Ion Doped Nano ZnO

Synthesis and Characterization of Rare Earth Ion Doped Nano ZnO

Effect of an electric field on photoluminescence of cadmium selenide nanocrystals

Luminescence Spectra of Quantum-Sized CdS and PbI2Particles in Static Electric Field

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Luminescence Spectra of Quantum-Sized CdS and PbI₂Particles in Static Electric Field