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Upconverted 5d-4f luminescence from Er and Nd ions doped into fluoride hosts excited by ArF and KrF excimer lasers |
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| Authors: | Eduard Aleksanyan Vachagan Harutunyan Rein Kink Yuri Maksimov Tatiana V Ouvarova |
| Institution: | a Institute of Physics, University of Tartu, Riia 142, 51014 Tartu, Estonia b Yerevan Physics Institute, Alikhanian Brothers Street 2, 0036 Yerevan, Armenia c P.N. Lebedev Physical Institute, Leninsky Prospect 53, 119991 Moscow, Russia d General Physics Institute, Vavilov Street 38, 119991 Moscow, Russia |
| Abstract: | We report on observation of upconverted VUV luminescence due to 5d-4f radiative transitions in Er3+ and Nd3+ ions doped into some fluoride crystals, under excitation by ArF and KrF excimer lasers, respectively. Only spin-forbidden 5d-4f luminescence of Er3+ (at 165 nm) was detected from the LiYF4:Er3+ crystal whereas both spin-forbidden (at 169 nm) and spin-allowed (at 160.5 nm) components are observed from the BaY2F8:Er3+ crystal, the latter being much weaker than in the case of one-photon excitation. Nd3+ 5d-4f luminescence at 180 and 173 nm has been detected from the LiYF4:Nd3+ and LaF3:Nd3+ crystals, respectively. The shift of short-wavelength edge of 5d-4f emission spectra towards longer wavelengths is observed under temperature increase from 15 to 293 K. The observed effects in the spectra of Er3+ and Nd3+ doped crystals were interpreted as a result of reabsorption of 5d-4f luminescence escaping from the bulk of the crystals. |
| Keywords: | 78 55 Hx 33 80 Rv 33 20 Ni 42 72 Bj |
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