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Главная / Публикации / Mechanisms and absolute quantum yield of upconversion luminescence of fluoride phosphors
Mechanisms and absolute quantum yield of upconversion luminescence of fluoride phosphors
Chinese Optics Letters Vol.16 (№9): P. 091901(1-5) · 10 September 2018
A.A. Lyapin1, S.V. Gushchin, A.S. Ermakov, S.V. Kuznetsov, P.A. Ryabochkina, V.Yu. Proydakova, V.V. Voronov, P.P. Fedorov and M.V. Chernov
A.A. Lyapin1, S.V. Gushchin, A.S. Ermakov, S.V. Kuznetsov, P.A. Ryabochkina, V.Yu. Proydakova, V.V. Voronov, P.P. Fedorov and M.V. Chernov
Abstract
Mechanisms of upconversion luminescence (UCL) of SrF2:Er phosphors corresponding to the ⁴G11/2 → ⁴I15/2, ²H9/2 → ⁴I15/2, ⁴F5/2 → ⁴I15/2, ⁴F7/2 → ⁴I15/2, ²H11/2 → ⁴I15/2, ⁴S3/2 → ⁴I15/2, ⁴F9/2 → ⁴I15/2, and ⁴I9/2 → ⁴I15/2 transitions upon excitation of the ⁴I11/2 level of Er³⁺ ions were investigated. Energy transfer upconversion processes are responsible for the populating of the ²H9/2, ²H11/2, ⁴S3/2, and ⁴F9/2 levels. Cooperative process is the dominant mechanism of luminescence from ⁴S3/2 and ⁴F9/2 levels for SrF2:Er with high concentrations of Er³⁺ ions. The UCL from ⁴G11/2 and ⁴F5/2 is explained by excited-state absorption. Cross-relaxation processes take part in the population of ⁴F9/2 and ⁴I9/2 levels. For quantifying material performance, the Er³⁺-concentration dependence of UCL and the absolute quantum yields of SrF2:Er were studied. The most intensive visible luminescence was obtained for SrF2:Er (14.2%) with 0.28% maximum quantum yield.
Mechanisms of upconversion luminescence (UCL) of SrF2:Er phosphors corresponding to the ⁴G11/2 → ⁴I15/2, ²H9/2 → ⁴I15/2, ⁴F5/2 → ⁴I15/2, ⁴F7/2 → ⁴I15/2, ²H11/2 → ⁴I15/2, ⁴S3/2 → ⁴I15/2, ⁴F9/2 → ⁴I15/2, and ⁴I9/2 → ⁴I15/2 transitions upon excitation of the ⁴I11/2 level of Er³⁺ ions were investigated. Energy transfer upconversion processes are responsible for the populating of the ²H9/2, ²H11/2, ⁴S3/2, and ⁴F9/2 levels. Cooperative process is the dominant mechanism of luminescence from ⁴S3/2 and ⁴F9/2 levels for SrF2:Er with high concentrations of Er³⁺ ions. The UCL from ⁴G11/2 and ⁴F5/2 is explained by excited-state absorption. Cross-relaxation processes take part in the population of ⁴F9/2 and ⁴I9/2 levels. For quantifying material performance, the Er³⁺-concentration dependence of UCL and the absolute quantum yields of SrF2:Er were studied. The most intensive visible luminescence was obtained for SrF2:Er (14.2%) with 0.28% maximum quantum yield.