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Luminescence of colloidal CdSe/ZnS nanoparticles: high sensitivity to solvent phase transitions.

Antipov A, Bell M, Yasar M, Mitin V, Scharmach W, Swihart M, Verevkin A, Sergeev A - Nanoscale Res Lett (2011)

Bottom Line: We investigate nanosecond photoluminescence processes in colloidal core/shell CdSe/ZnS nanoparticles dissolved in water and found strong sensitivity of luminescence to the solvent state.First of all, the luminescence intensity substantially (approximately 50%) increases near the transition.The observed effects are associated with the reconstruction of ligands near the ice/water phase transition.

View Article: PubMed Central - HTML - PubMed

Affiliation: Electrical Engineering Department, University at Buffalo, Buffalo, NY 14260, USA. vmitin@buffalo.edu.

ABSTRACT
We investigate nanosecond photoluminescence processes in colloidal core/shell CdSe/ZnS nanoparticles dissolved in water and found strong sensitivity of luminescence to the solvent state. Several pronounced changes have been observed in the narrow temperature interval near the water melting point. First of all, the luminescence intensity substantially (approximately 50%) increases near the transition. In a large temperature scale, the energy peak of the photoluminescence decreases with temperature due to temperature dependence of the energy gap. Near the melting point, the peak shows N-type dependence with the maximal changes of approximately 30 meV. The line width increases with temperature and also shows N-type dependence near the melting point. The observed effects are associated with the reconstruction of ligands near the ice/water phase transition.

No MeSH data available.


Related in: MedlinePlus

Integrated PL intensity (solid circles) and PL peak intensity (open circles) of in-liquid CdSe/ZnS NPs.
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Figure 2: Integrated PL intensity (solid circles) and PL peak intensity (open circles) of in-liquid CdSe/ZnS NPs.

Mentions: Photoluminescence of the in-liquid sample dramatically differs from dry NPs behavior and exhibits several local peaks at some distinct temperatures in the temperature range of 230-300 K. The most pronounced local maximum in PL intensity (approximately 50%) occurs near the water freezing point T = 273 K (Figure 1b). However, the temperature position of this maximum is shifted by about 5 K below the expected phase transition temperature (see Figure 2).


Luminescence of colloidal CdSe/ZnS nanoparticles: high sensitivity to solvent phase transitions.

Antipov A, Bell M, Yasar M, Mitin V, Scharmach W, Swihart M, Verevkin A, Sergeev A - Nanoscale Res Lett (2011)

Integrated PL intensity (solid circles) and PL peak intensity (open circles) of in-liquid CdSe/ZnS NPs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211190&req=5

Figure 2: Integrated PL intensity (solid circles) and PL peak intensity (open circles) of in-liquid CdSe/ZnS NPs.
Mentions: Photoluminescence of the in-liquid sample dramatically differs from dry NPs behavior and exhibits several local peaks at some distinct temperatures in the temperature range of 230-300 K. The most pronounced local maximum in PL intensity (approximately 50%) occurs near the water freezing point T = 273 K (Figure 1b). However, the temperature position of this maximum is shifted by about 5 K below the expected phase transition temperature (see Figure 2).

Bottom Line: We investigate nanosecond photoluminescence processes in colloidal core/shell CdSe/ZnS nanoparticles dissolved in water and found strong sensitivity of luminescence to the solvent state.First of all, the luminescence intensity substantially (approximately 50%) increases near the transition.The observed effects are associated with the reconstruction of ligands near the ice/water phase transition.

View Article: PubMed Central - HTML - PubMed

Affiliation: Electrical Engineering Department, University at Buffalo, Buffalo, NY 14260, USA. vmitin@buffalo.edu.

ABSTRACT
We investigate nanosecond photoluminescence processes in colloidal core/shell CdSe/ZnS nanoparticles dissolved in water and found strong sensitivity of luminescence to the solvent state. Several pronounced changes have been observed in the narrow temperature interval near the water melting point. First of all, the luminescence intensity substantially (approximately 50%) increases near the transition. In a large temperature scale, the energy peak of the photoluminescence decreases with temperature due to temperature dependence of the energy gap. Near the melting point, the peak shows N-type dependence with the maximal changes of approximately 30 meV. The line width increases with temperature and also shows N-type dependence near the melting point. The observed effects are associated with the reconstruction of ligands near the ice/water phase transition.

No MeSH data available.


Related in: MedlinePlus