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- W91656689 abstract "Several models have been proposed to explain the origin of the red Er3+ luminescence in the infrared to visible upconverting crystals doped with Er and Yb ions. All but one postulate that papulation of the red emitting 4F9/2 Er3+ state is due to different nonradiative relaxation mechanisms of the green emitting 4S3/2 Er3+ state. To clarify this problem, the red to green emission intensity ratio and temporal evolutions of the 4F9/2 and 4S3/2 states were investigated in CdF2:Er, Yb crystals at 77 K. The green 514.5 nm argon laser line was used as an excitation source. The rate equations were examined for each model and their solutions were compared with the experimental results. It was shown that localized processes, such as multiphonon relaxation and cross-relaxation. play an important role only for low excitation density or low Yb3+ concentration. In the other cases the spatial energy diffusion among Yb3+ ions should be considered and nonlocalized mechanisms dominate, giving up to 98% of red Er3+ emission intensity under certain conditions. Their relative probabilities were discussed." @default.
- W91656689 created "2016-06-24" @default.
- W91656689 creator A5080177031 @default.
- W91656689 date "1984-01-01" @default.
- W91656689 modified "2023-09-27" @default.
- W91656689 title "On the Role of Nonlocalized Excitation Mechanisms in the Generation of Red Er3+ Emission in CdF2:Er, Yb" @default.
- W91656689 doi "https://doi.org/10.1007/978-1-4613-2407-2_28" @default.
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