Quantitative Elucidation of the Infrared-to-Visible Conversion Processes in YF_3: Yb, Er Phosphors

概要

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A method of systematic evaluation and determination of host parameters is developed for infrared-to-visible conversion phosphors based on a simple rate equation model. Calculated rise characteristics of the visible emissions are in satisfactory agreement with the experimental results obtained for YF_3: Yb, Er phosphors. Several host parameters, such as nonradiative decay rate and energy transfer coefficient, were obtained systematically by fitting the calculated curves with expermental data. It was shown that the conversion efficiency of the infrared light into the green emission is dependent on nonradiative decay rate as well as sensitizer excited state lifetime, both of which are sensitive to preparation procedures. Discussions are presented on the applicability limit of the rate equation model.
社団法人応用物理学会の論文
1973-04-05