Abstract

The quenching of the fluorescence of active dopant (Nd3+) by randomly distributed quenchers (–OH) positioned in the volume of the NPs is a major dissipative channel that directly impacts the quality of the nanoparticles as fluorescent agent in the near IR spectral range. First, a basic understanding of the quenching mechanism has direct practical value for optimization of their efficiency. Second, the fluorescence kinetic studies provide information on the structure of a system and the types of physical interactions that are realized in the process of energy migration and dissipation of optical excitation. In view of the foregoing, the reliable and very sensitive method for the quality control of the fluorescent nanoparticles based on the analysis of the kinetics of impurity quenching, “an energy transfer probing”, is very perspective.