Luminescence and photophysics of cadmium sulfide semiconductor clusters: the nature of the emitting electronic state

Chestnoy, N.; Harris, T. D.; Hull, Robert; Brus, L. E.

doi:10.1021/j100406a018

Cited by 710 publications

(421 citation statements)

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“…This prediction has been supported experimentally for the donor-acceptor pair luminescence of the CdS nanocrystals prepared by the chemical method. 23 Contrary to the above prediction, the luminescence spectrum of our nanoparticles is shifted largely to the low-energy side compared with that of the bulk powder, as seen in Fig. 4.…”

Section: Resultscontrasting

confidence: 74%

Luminescence properties of ZnS phosphor nanocrystals prepared by the laser-induced gas-evaporation method

Tanaka¹,

Sawai

Sengoku

et al. 2000

Journal of Applied Physics

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Nanocrystalline particles of ZnS:͑Ag, Al͒ semiconductor phosphor, whose sizes are mostly 3-5 nm in diameter, are prepared by the gas-evaporation method with cw CO 2 laser heating. The Raman scattering spectrum as well as the transmission electron microscope observation demonstrates that the crystallization of the nanoparticles was caused successfully through the gas-phase condensation. Under irradiation of ultraviolet light, the nanoparticles exhibit blue luminescence, as in the case of the starting material of ZnS:͑Ag, Al͒ bulk powder. The peak of the luminescence spectrum of the nanoparticles shifts to lower energy with increasing delay time and also with decreasing excitation intensity, showing that the luminescence originates from the donor-acceptor pair recombination. However, it is concluded that the luminescence of the nanoparticles is not ascribed to the blue Ag luminescence mechanism responsible for the luminescence of the bulk powder, by taking into account the spatial confinement of an electron trapped at the donor and a hole at the acceptor. It is argued that the luminescence mechanism of the nanoparticles is the so called self-activated luminescence, which involves zinc vacancies.

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Section: Resultscontrasting

confidence: 74%

Luminescence properties of ZnS phosphor nanocrystals prepared by the laser-induced gas-evaporation method

Tanaka¹,

Sawai

Sengoku

et al. 2000

Journal of Applied Physics

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“…The answer to this question has been obtained by the luminescence spectrum that was produced from the colloidal suspension formed when CdCl solution in isopropanol was mixed very rapidly with Na S solution in methanol. It is known that crystalline CdS particles do not give any fluorescence whereas CdS colloids formed in micrometer size luminesce at different wavelengths depending on their particle sizes [9]. Cadmium sulfide formed with the above procedure had colloidal dimensions and gave exactly the same fluorescence spectrum as that from the CdCl -treated filter paper exposed to H S (Fig.…”

Section: Decay Features Of the Luminescence Signalsmentioning

confidence: 88%

Hydrogen sulfide determination by solid surface luminescence

Eroğlu

Volkan

Bayramh

et al. 1996

Analytical and Bioanalytical Chemistry

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In the analytical system suggested, atmospheric hydrogen sulfide reacts with the surface of a filter paper treated with aqueous cadmium chloride and yields a luminescent species whose intensity can be correlated with the analyte concentration in ambient air. It was shown that the luminescent species are CdS solid particles which were formed in a well defined size. The paper luminescence was also tried on polymeric surfaces; polyethyleneoxide, polyvinyl alcohol, ethylcellulose and carboxymethylcellulose were found to give a similar luminescence signal. The system can be used on the tip of an optical fiber for an irreversible, cumulative type of analytical device for hydrogen sulfide determination. The 3s detection limit for the paper luminescence detection system was 7.8 ppb H S.

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“…This can be attributed to the donor-acceptor (D-A) band transition. 26,27 The products can be used as purple light emitting nanodevices because the emission peak is in the visible light area.…”

Section: Uv-vis and Photoluminescence Spectramentioning

confidence: 99%

Synthesis and characterization of ZnS nanotubes with crossed-channels

Chen

Ding

2007

J. Braz. Chem. Soc.

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Nanotubos de ZnS em forma de X foram sintetizados usando um método hidrotérmico. Uma nova reação hidrotérmica envolvendo hidrólise e oxidação simultâneas do solvente foi desenvolvido usando zinco em pó, água e NH 2 CSNH 2 como reagentes. As imagens de microscopia de transmissão eletrônica mostram que cada segmento dos canais tem cerca de 400 a 500 nm de comprimento. O diâmetro interno é 50 nm e o externo 70 nm e o espaço entre as camadas é cerca de 7 nm. Dados de difração de raios (XRD) mostram que o nanotubo obtido apresenta boa cristalização na fase Esfalerita cúbica. A banda em 293 nm no espectro de absorção no ultravioleta-visível encontra-se deslocado para o azul em cerca de 50 mm em relação ao ZnS bulk. O espectro de fotoluminescência dos nanotubos de ZnS mostra que o pico de emissão ocorre em 409 nm quando excitado a 365 nm.ZnS nanotubes with crossed-channels have been synthesized successfully using a hydrothermal method. A novel hydrothermal reaction of simultaneous solvent-oxidationhydrolysis has been developed using Zn powder, H 2 O and NH 2 CSNH 2 as reagents. TEM images show that each branch of the channels is about 400-500 nm long. The inner diameter is 55 nm, the outer diameter is 70 nm, and the interlayer spacing is about 7 nm. XRD data show that the product is well-crystallized in the cubic Sphalerite phase. The peak appears at 293 nm in the UV-Vis absorption spectrum, which is about 50 nm blue shifted from the bulk counterpart. The photoluminescence spectrum of ZnS nanotubes shows that the emission peak occurs at 409 nm when excited at 365 nm.

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Luminescence and photophysics of cadmium sulfide semiconductor clusters: the nature of the emitting electronic state

Cited by 710 publications

References 0 publications

Luminescence properties of ZnS phosphor nanocrystals prepared by the laser-induced gas-evaporation method

Luminescence properties of ZnS phosphor nanocrystals prepared by the laser-induced gas-evaporation method

Hydrogen sulfide determination by solid surface luminescence

Synthesis and characterization of ZnS nanotubes with crossed-channels

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