Energy transfer rates of KYsub(3)Fsub(10):Yb:Nd:Tm crystals
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2008
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NTERNATIONAL CONFERENCE ON DEFECTS IN INSULATING MATERIALS, 16th
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In this work we present the spectroscopic properties of KY3F10 (KY3F) single
crystals doped with thulium and also co-doped with ytterbium and/or neodymium,
KY3F:Yb:Nd:Tm and KY3F:Nd:Tm. The most important processes that lead to the thulium up
conversion emissions were identified. The absorption spectra of the samples were measured at
room temperature in the range of 200 nm-1200 nm. The emission spectra were obtained by
exciting the samples with a 797 nm laser diode and were analyzed using a lock-in amplifier
technique. A time-resolved luminescence spectroscopy technique was employed to measure the
luminescence decays and to determine the mechanisms involved in the energy transfer upconversion processes. Analysis of the energy transfer processes dynamics in KY3F:Yb:Tm:Nd
crystal, using selective pulsed-laser excitations, shows that the energy transfer from Nd3+ to
Yb3+ ions is the mechanism responsible for the enhancement of the blue up-conversion
efficiency when compared with the Yb:Tm system. In the case of KY3F:Nd:Tm it is observed
emissions at 350, 355 and 452 nm excited by an additional Yb:Tm step cross relaxation, Yb
(2F5/2) : Tm (1G4) that populates the 1D2 (Tm3+) excited level. A study of the energy transfer
processes in KY3F:Yb:Tm:Nd crystal showed that the 1G4 excited level is mainly populated
by the sequence of two nonradiative energy processes that starts well after the Nd3+ and
Tm3+ excitation at 797nm: Nd (4F3/2) → Yb (2F7/2) followed by Yb (2F5/2) → Tm (3H4) →
Tm (1G4).
Como referenciar
COURROL, L.C.; LINHARES, H.M.S.M.D.; LIBRANTZ, A.F.H.; BALDOCHI, S.L.; GOMES, L.; RANIERI, I.M. Energy transfer rates of KYsub(3)Fsub(10):Yb:Nd:Tm crystals. In: NTERNATIONAL CONFERENCE ON DEFECTS IN INSULATING MATERIALS, 16th, August 24-29, 2008, Aracaju, SE. Proceedings... DOI: 10.1088/1742-6596/249/1/012010. Disponível em: http://repositorio.ipen.br/handle/123456789/4628. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.