# 6d5f configuration of U$^{4+}$ doped into LiYF$^4$ crystal

Abstract : Observation of luminescence due to 6d5f5f2 electronic interconfigurational transitions in U4+ doped into LiYF4 crystal is reported. This luminescence originating from the lowest level of the 6d5f electronic configuration and terminating on different levels of the 5f2 electronic configuration of U4+ consists of four relatively wide emission bands in the UV spectral range (240-370 nm), characterised by a luminescence decay time of 15 ns at 300 K. Excitation spectrum of U4 +6d5f 5f2 luminescence has a threshold at 250 nm and at least nine bands in the transparency region of the host. The properties of U4+ 6d5f5f2 luminescence are similar to those of 5d4f4f2 luminescence of Pr3+ ion embedded into crystals where the lowest 5d4f level of Pr3+ lies below the 1S0 (4f2) level. U4+-doped fluoride crystals can be considered as promising materials for tuneable UV solid-state lasers based on df transitions.
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Journal articles
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http://hal.in2p3.fr/in2p3-00011858
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Submitted on : Wednesday, September 4, 2002 - 3:19:28 PM
Last modification on : Friday, April 2, 2021 - 4:58:06 PM

### Identifiers

• HAL Id : in2p3-00011858, version 1

### Citation

N.Yu. Kirikova, M. Kirm, J.C. Krupa, V.N. Makhov, G. Zimmerer, et al.. 6d5f configuration of U$^{4+}$ doped into LiYF$^4$ crystal. Journal of Luminescence, Elsevier, 2002, 97, pp.174-179. ⟨in2p3-00011858⟩

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