Люминесцентные плазмонные структуры из наночастиц золота и углеродных наноточек в мезопористых частицах кремнезема

The composite plasmonic structures consisting of gold nanoparticles and carbon nanodots within monodisperse spherical mesoporous silica particles were synthesized. A threefold increase of visible photoluminescence intensity of carbon nanodots in these structures was demonstrated compared to structures without gold nanoparticles

Introductory lecture: origins and applications of efficient visible photoluminescence from silicon-based nanostructures

This review highlights many spectroscopy-based studies and selected phenomenological studies of silicon-based nanostructures that provide insight into their likely PL mechanisms, and also covers six application areas.

Retraction: Facile fabrication of water-dispersible AgInS2 quantum dots and mesoporous AgInS2 nanospheres with visible photoluminescence

Retraction of ‘Facile fabrication of water-dispersible AgInS2 quantum dots and mesoporous AgInS2 nanospheres with visible photoluminescence’ by Hui Jin et al., RSC Adv., 2015, 5, 68287–68292. DOI: 10.1039/C5RA11545K

Enhanced Effect of Band Bending on Visible Photoluminescence from ZnO Nanoparticles of Smaller Sizes in Ionic Environment

We report a novel approach to control the defect-mediated visible photoluminescence (PL) of small ZnO nanoparticles (NPs) by changing the ionic environment viz. concentration of LiClO4 or NaCl (electrolytes) in the medium in which NPs are dispersed. For both the electrolytes, overall intensity of visible PL emission decreases and the spectral components (∼2.35 eV and ∼2.19 eV) of it shift towards lower energy side with increase in electrolyte concentration. Such changes are more prominent in case of NaCl than LiClO4. We have explained all these observations in the basis of accumulation of surface charge, due to the presence of electrolyte, which controls the band bending in the depletion layer at the surface of the NPs. Furthermore, the band bending results in corresponding change of number of emission centres (here, relative number of singly ionized oxygen vacancies or doubly ionized oxygen vacancies) which predominantly decides the nature of visible emission. An enhancement of this effect has been observed in case of smaller NPs of size comparable to the width of the depletion layer. This study can open up a way to control the visible emission from the ZnO NPs and can be useful for sensing the processes involving surface charge in the fields such as biophysics and biochemistry.