Abstract
Some interesting phenomena have been described recently and attempts were made to understand them mechanistically. The keywords of these studies are, for example, excitonic, trapped, and delayed fluorescence.10-14 Beyond that, attention has been drawn to nonlinear optical effects,'s20 transitions to higher excited electron transfer from the conduction band of CdS to quenching molecule^^^-^^ or from one colloidal particle to others such as AgI, ZnO,= AB~S,~~ or solid, and colloidal Ti02.31J2,3436 CdS is a very attractive model substance due to its stability, easy preparation and handling, and last, but not least, its distinct band gap that enables one to easily detect a number of optical properties. All the performed experiments underline the importance of the surface condition of the respective CdS particles. This is due to their very small size
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