Ion Beam Deposition Technique for Fabricating Luminescent Thin Films from a Solution of Nanocrystalline Semiconductor Dots

Kobayashi, Satoshi; Tani, Yoshiaki; Kawazoe, Hiroshi

doi:10.1143/jjap.46.l392

Cited by 16 publications

(14 citation statements)

References 26 publications

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“…The possibility of aggregation of the QDs is also ruled out by the fact that a linear relationship between the absorbance and concentration for the solutions was confirmed under the present experimental conditions (<1 μM in benzonitrile). The diameter of the CdSe core was evaluated to be 2.2 ± 0.1 nm by the first (1S 3/2 1S e ) excitonic absorption peak . Because 1−2 monolayers of the ZnS shell were grown over the CdSe core, the thickness of the shell is approximately 0.31−0.62 nm …”

Section: Resultsmentioning

confidence: 99%

“…The diameter of the CdSe core was evaluated to be 2.2 ( 0.1 nm by the first (1S 3/2 1S e ) excitonic absorption peak. 37 Because 1-2 monolayers of the ZnS shell were grown over the CdSe core, the thickness of the shell is approximately 0.31-0.62 nm. 38 The PL quantum yield (φ PL ) is an important parameter for the quantitative evaluation of luminescent materials.…”

Section: Steady-state Uv-visible Absorption and Pl Spectramentioning

confidence: 99%

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Solvent-Polarity Dependence of Electron-Transfer Kinetics in a CdSe/ZnS Quantum Dot−Pyromellitimide Conjugate

et al. 2009

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Photoinduced electron transfer (ET) to and from semiconductor quantum dots (QDs) is of intense interest because of its important roles in QD-based devices, such as detectors, light-emitting diodes, and solar cells. In this study, we have investigated the solvent dependence of the interfacial ET between ZnS-capped CdSe (CdSe/ZnS) QDs and pyromellitimide (PI) at the ensemble and single-particle levels. The steady-state and time-resolved photoluminescence (PL) and absorption measurements revealed that the rates of ET from the excited CdSe/ZnS to the adsorbed PI-CA molecules in nonpolar solvents, such as octane and toluene, are higher than aprotic polar solvents, such as benzonitrile. Furthermore, it was found that two pathways are included in the ET processes between CdSe/ZnS and PI, that is, ET from the excited CdSe core to PI-CA molecules adsorbed on the surface of the CdSe or ZnS. The former process proceeds on the picosecond time scale, while the latter proceeds on the nanosecond time scale. The interfacial ET dynamics in individual CdSe/ZnS-PI conjugates in different solvents were next examined. The PL intermittency or blinking kinetics of single QDs were analyzed by adapting a diffusion-controlled electron transfer (DCET) theory for the probability distribution of the "on" events. The results, which are qualitatively consistent with that obtained from the bulk experiments, clearly showed that the probability of the ET events increases with the decreasing solvent polarity. Consequently, our findings provide new insight into the mechanism of the interfacial ET reactions on the semiconductor nanoparticles and potentially contribute to the development of the design of QD-based devices.

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Section: Resultsmentioning

confidence: 99%

Section: Steady-state Uv-visible Absorption and Pl Spectramentioning

confidence: 99%

Solvent-Polarity Dependence of Electron-Transfer Kinetics in a CdSe/ZnS Quantum Dot−Pyromellitimide Conjugate

et al. 2009

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“…1 Because of these features, QDs are expected to have applications in various light-emitting devices, such as light-emitting diodes (LEDs) 2,3 and electroluminescent devices. 4,5 Although light-emitting devices based on QDs are still under development, QDs are currently being used as phosphors for blue LED backlight downconversion in commercial liquid-crystal displays (QD-LCDs). 6−8 Because the QD phosphors enable the realization of a wide color range and excellent energy efficiency, they are suitable to the next-generation displays, responding to the switching from full-high-definition to ultrahigh-definition television broadcasts.…”

Section: Introductionmentioning

confidence: 99%

Colloidal Zn(Te,Se)/ZnS Core/Shell Quantum Dots Exhibiting Narrow-Band and Green Photoluminescence

et al. 2018

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Colloidal CdSe quantum dot (QD) phosphors have attracted considerable attention as green and red phosphors for blue backlight downconversion in next-generation liquid-crystal displays because of their excellent emission features including tunable emission wavelength and narrow emission bands. Alternatives to CdSe, which do not contain toxic cadmium, are strongly desired to ensure safety and reduce the environmental load of consumer products. Herein, we synthesized colloidal Zn(Te,Se)/ZnS core/shell QDs and demonstrated narrow-band green photoluminescence (PL) emission. A full width at half-maximum of 30 nm was achieved for PL emission at 535 nm from Zn(Te 0.77 Se 0.23 )/ZnS core/shell QDs with a core QD diameter of 4.3 nm. This emission characteristic was as good as that of CdSe QDs.

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“…Because the emission energy is dependent on their size due to the quantum size effect, the colloidal semiconductor QDs are expected to have significant potential technological applications such as light emitting devices [11][12][13][14][15][16], photovoltaics [17] and biochemical fluorescent tags [18,19]. For applications in the ultraviolet (UV) region, the sizedependent UV emission is expected for ZnO QDs.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of LiGaO2 nanocrystals and their application toward bright UV emission from ZnO quantum dots

Omata

Tazuke

Nose

et al. 2011

Journal of Crystal Growth

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Ion Beam Deposition Technique for Fabricating Luminescent Thin Films from a Solution of Nanocrystalline Semiconductor Dots

Abstract: Global existence of solutions to the coupled Einstein-Maxwell-Vlasov system which rules the dynamics of a collisionless charged plasma is proved in Bianchi I-VIII space-times, and asymptotic behaviour is investigated in the case of a positive cosmological constant.

Cited by 16 publications

References 26 publications

Solvent-Polarity Dependence of Electron-Transfer Kinetics in a CdSe/ZnS Quantum Dot−Pyromellitimide Conjugate

Solvent-Polarity Dependence of Electron-Transfer Kinetics in a CdSe/ZnS Quantum Dot−Pyromellitimide Conjugate

Colloidal Zn(Te,Se)/ZnS Core/Shell Quantum Dots Exhibiting Narrow-Band and Green Photoluminescence

Synthesis of LiGaO2 nanocrystals and their application toward bright UV emission from ZnO quantum dots

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