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Article Dans Une Revue Optics Express Année : 2019

Super-quadratic upconversion luminescence among lanthanide ions

Résumé

We explore the arguably most fundamental aspect of energy-transfer upconversion (ETU), namely the dependence of upconversion luminescence from a higher-energy level, following ETU excitation from a metastable lower-energy level, on direct luminescence from that metastable level. We investigate ETU among neighboring Nd3+ ions in single crystals of GdVO4 and LaSc3(BO3)4 with different doping concentrations by measuring, after short-pulse laser excitation with different pump energies, the infrared luminescence decay from the metastable 4F3/2 level and the yellow upconversion luminescence decay from the 4G7/2 level. We observe a highly super-quadratic dependence of upconversion on direct luminescence intensity. We conclude that the commonly assumed quadratic law of ETU, as proposed by Grant’s model and frequently employed in rate-equation simulations, is inadequate to the description of ETU processes. Whereas Zubenko’s model, which considers a finite migration rate, provides significantly better fits to the experimental luminescence-decay curves, also this model cannot accurately reproduce the measured decay curves, partly because it does not take the non-homogeneous distribution of active ions into account.
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Dates et versions

hal-02392501 , version 1 (24-08-2023)

Identifiants

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Irene Carrasco, L. Laversenne, Stefano Bigotta, Alessandra Toncelli, Mauro Tonelli, et al.. Super-quadratic upconversion luminescence among lanthanide ions. Optics Express, 2019, 27 (23), pp.33217-33232. ⟨10.1364/OE.27.033217⟩. ⟨hal-02392501⟩

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