High-temperature VUV spectroscopy of KYF4 crystals doped with Nd3+, Er3+ and Tm3+ ions |
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| Institution: | 1. P. N. Lebedev Physical Institute, 53 Leninskiy Prospekt, 119991 Moscow, Russia;2. N. S. Kurnakov Institute of General and Inorganic Chemistry, 31 Leninskiy Prospekt, 119991 Moscow, Russia;3. Institute of Physics, University of Tartu, 14c Ravila, 50411 Tartu, Estonia;1. Key Laboratory of Optoelectronic Materials Chemistry and Physics of CAS, Fujian Institute of Research on the Structure of Matter, CAS, Fuzhou, Fujian 350002, PR China;2. University of Chinese Academy of Sciences, Beijing 100039, PR China;3. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, CAS, Fuzhou 350002, PR China;1. Physics and Astronomy Department, University of Padova, Via Marzolo 8, 35131 Padova, Italy;2. CNR-IOM c/o European Synchrotron Radiation Facility, B.P. 220, F-38043 Grenoble, France;3. Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, Dorsoduro 2137, I-30123 Venice, Italy;1. Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland;2. Institute of Electronic Materials Technology, ul. Wólczyńska 133, 01-919 Warszawa, Poland |
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| Abstract: | Thermal quenching of 5d-4f luminescence from Nd3+, Er3+ and Tm3+ ions doped into KYF4 crystals has been investigated in the temperature range up to ∼750 K where this luminescence is completely quenched. The obtained temperatures of thermal quenching (Tq) are ∼270, 495, 450 K for Nd3+, Er3+, Tm3+, respectively. At high temperatures, thermal quenching of 5d-4f luminescence from Nd3+ and Er3+ is accompanied by the appearance of 4f-4f luminescence from the lower-energy 4f levels. It has been shown that the dominating mechanism of thermal quenching for Nd3+ and Er3+ ions is thermally stimulated non-radiative transitions (intersystem crossing) from the 5d states to lower-energy 4f levels, namely 2G(2)9/2 and 2F(2)7/2, respectively, whereas for the Tm3+ ion, thermally stimulated ionization of 5d electrons to the conduction band states is responsible for thermal quenching of 5d-4f luminescence. The energy gap between the lowest Tm3+ 5d level and the bottom of the KYF4 conduction band has been estimated to be 0.66 eV. |
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| Keywords: | Thermal quenching |
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