The Effect Of Surrounding Media On The Spontaneous Radiative Lifetime Of The Emitters

Tremendous progresses have been made on the study of luminescence phenomena along with the development of modern physics. The essence of luminescence is the radiative transition between energy levels. The rare-earth ions and quantum dot are representative luminescent materials due to their outstanding properties. As a main aspect of luminescent properties, the radiative lifetime attracts wide focus, both experimentally and theoretically. There are quite a few models in the literature to describe the effect of the dielectric media on the radiative lifetime, together with some experimental justifications. Among the models are the two most important ones: the virtual-cavity and the real-cavity models.To clarify the dependence of radiative lifetime of luminescent center on the media, we analyze the two models, reinterpret the existed experimental results, and give the criteria of the applicable conditions for each model in Chapter 3.Based on the extended real-cavity model, we discuss in Chapter 4 the fluctuation of the radiative lifetime of the luminescent-ion-containing nanoparticles in media by considering the fluctuation of refractive index and local electric field caused by the random distribution of nanoparticles in the media.