Simulating Energy Transfer and Upconversion in β-NaYF 4 : Yb 3+ , Tm 3+

Villanueva Delgado, Pedro; Krämer, Karl; Valiente, Rafael (2015). Simulating Energy Transfer and Upconversion in β-NaYF 4 : Yb 3+ , Tm 3+. Journal of physical chemistry. C, 119(41), pp. 23648-23657. American Chemical Society 10.1021/acs.jpcc.5b06770

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The design of upconversion phosphors with higher quantum yield requires a deeper understanding of the detailed energy transfer and upconversion processes between active ions inside the material. Rate equations can model those processes by describing the populations of the energy levels of the ions as a function of time. However, this model presents some drawbacks: energy migration is assumed to be infinitely fast, it does not determine the detailed interaction mechanism (multipolar or exchange), and it only provides the macroscopic averaged parameters of interaction. Hence, a rate equation model with the same parameters cannot correctly predict the time evolution of upconverted emission and power dependence under a wide range of concentrations of active ions. We present a model that combines information about the host material lattice, the concentration of active ions, and a microscopic rate equation system. The extent of energy migration is correctly taken into account because the energy transfer processes are described on the level of the individual ions. This model predicts the decay curves, concentration, and excitation power dependences of the emission. This detailed information can be used to predict the optimal concentration that results in the maximum upconverted emission.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Villanueva Delgado, Pedro and Krämer, Karl

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

1932-7447

Publisher:

American Chemical Society

Language:

English

Submitter:

Karl Krämer

Date Deposited:

19 Jan 2016 08:35

Last Modified:

19 Jan 2016 08:35

Publisher DOI:

10.1021/acs.jpcc.5b06770

BORIS DOI:

10.7892/boris.74133

URI:

https://boris.unibe.ch/id/eprint/74133

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