Photoluminescence single nanoparticles

Figure 17.12 (A) Schematic presentation of deactivation and energy transfer processes in a single quantum dot placed on an Ag nanoparticle film. (B) Photoluminescence intensity trajectories of single quantum dots on a glass substrate (a) and on an Ag nanoparticle film (b). The traces in green represent background intensities. (C) Photoluminescence spectra of quantum dot solutions in the presence of...

The protein-nanoparticle complex was prepared by adding a dimethylformamide (DMF) solution of preformed CdS nanoparticles ranging from 2 to 4 nm to a solution of heat shock protein. As a result, the CdS nanoparticles diffused into the heat shock pore analogous to a damaged protein over a period of 100 h. TEM analysis revealed that as much as 75% of the proteins contained a single discrete nanoparticle core of CdS. Upon subsequent inclusion, the CdS complex displayed intense photoluminescence from 430 to... 

Figure 4.13 Enhancement of quantum dots photoluminescence near a nancqiarticle as a function of excitation wavelength for several single metal nani iarticles. Black dots are the ratio of the photoliuninescence near a nanc article to photoluminescence ir from a nanoparticle. The trace in each spectra is the LSPR...

Triplet repeats of single-stranded (CCG)n are thought to form hairpin structures, while (CGG)n runs are thought to form tetraplexes [160-165]. The binding of these structures, where n = 7, to photoluminescent nanoparticles of CdS that... 

Data from the P. Alivisatos group show another example of quantum confinement effects in the optical absorbance, photoluminescence and electroluminescence spectra of CdS and CdSe-MEH-PPV nanocomposites (Fig. 8). The mentioned phenomena can be utilized both for LED applications, as will be described below, or for the manufacture of photovoltaic cells. In the case of solar cells, filling the polymer matrix with nanoparticles which possess different band gaps makes them similar to multi-band gap solar cells, which were reported to show much higher values of energy conversion efficiencies than their single band gap counterparts. The effect becomes even more pronounced if the particles can be placed with the higher band gap closer to the illumi-... 

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