### Abstract

Luminescence decay curves of Sm3+ ions in LiVF4 crystals doped with 1.5 and 10 mol% Sm3+ are multi-exponential, whereas that in a LiYF4 crystal doped with 0.1 mol% Sm3+ is well approximated by a single exponential function with a decay time of 4.8 ms. The average luminescence decay times decrease from 4.8 to 0.60 ms with the increasing Sm3+ concentrations between 1 and 10 mol%. The decay curves for all crystals are found to be almost independent of the temperature between 15 and 300 K. The decrease of the decay times for the higher Sm3+ concentrations indicates energy transfer between two Sm3+ ions. Taking the crystal structure of LiYF4 into account, it is deduced that a single-step energy transfer process for the 1 and 5 mol% Sm3+ concentrations occurs from a Sm3+ ion at the origin of (0 0 0) to one of the Sm3+ ions substituting for the first nearest neighbor Y3+ sites and beyond within a sphere with an approximate radius of less than 0.7 nm. On the other hand, a multi-step energy transfer process dominates for the highest concentration (10 mol%) because the calculated average distance between two Sm3+ ions in the 10 mol% Sm3+ sample is comparable with the migration length of the single-step energy transfer process estimated from the 1 and 5 mol% Sm3+ samples.

Original language | English |
---|---|

Pages (from-to) | 1608-1617 |

Number of pages | 10 |

Journal | Journal of Luminescence |

Volume | 132 |

Issue number | 6 |

DOIs | |

Publication status | Published - Jun 2012 |

### Keywords

- samarium
- LiYF4
- luminescence
- energy transfer
- cross relaxation

## Fingerprint Dive into the research topics of 'Resonant energy transfer and cross relaxation between Sm3+ ions in LiYF4 crystals'. Together they form a unique fingerprint.

## Cite this

*Journal of Luminescence*,

*132*(6), 1608-1617. https://doi.org/10.1016/j.jlumin.2012.01.028