Blue up-conversion emission in Yb- and Tm-codoped potassium yttrium tungstate

Autor:	A.N. Titov, L.E. Batay, Paras N. Prasad, Wieslaw Strek, Artur Bednarkiewicz, Alexander Demidovich, A. V. Kachynski, Andrey N. Kuzmin
Rok vydání:	2004
Předmět:	Ytterbium Photoluminescence Chemistry Inorganic chemistry Analytical chemistry Physics::Optics General Physics and Astronomy chemistry.chemical_element Yttrium Ion chemistry.chemical_compound Thulium Tungstate Luminescence Lasing threshold
Zdroj:	Journal of Applied Physics. 95:7862-7866
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.1736320
Popis:	The spectroscopic characteristics of potassium yttrium tungstate crystal (KYW), codoped with ytterbium and thulium ions, have been investigated from the point of view of up-conversion blue lasing from 1G4 multiplet. An overall 3H6 multiplet splitting of ∼530 cm−1 for the trivalent thulium ion in the KYW host was obtained. A decay time of ∼112 μs for the 1G4→3H6 blue luminescence in the material doped by 1 at. % of thulium was measured. The value of peak emission cross section for this transition is estimated to be (1.8±0.3)×10−20 cm2. Strong cross-relaxation quenching was found to be one of the main channels of nonradiative losses from the 1G4 and 3H4 multiplets. The cross-relaxation rate was significantly higher at higher concentration of thulium.
Databáze:	OpenAIRE
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