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For emitters embedded in surrounding media, different macroscopic or microscopic theoretical models predict substantially different dependencies of the spontaneous emission rate or lifetime on the refractive index. Various measurements have been carried out on Eu 3+ , Ce 3+ and Nd 3+ ions, and quantum dots in different surrounding media. The dependence of the spontaneous emission...
By close analysis of the available experimental results on the spontaneous emission lifetime of various emitters in different media and examining the assumptions underlying the two titled models, we reach a consistent interpretation of the experimental results and give a practical criterion on which model is applicable for a given situation.
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