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- Title
Spectroscopic characteristics of praseodymium-doped cubic double sodium-yttrium fluoride crystals NaYF:Pr. Intensities of optical transitions and luminescence kinetics.
- Authors
Tkachuk, A.; Ivanova, S.; Mirzaeva, A.; Joubert, M.; Guyot, Y.
- Abstract
Using the Bridgman-Stockbarger technique, we have grown a series of cubic crystals NaYF:Pr (NYF:Pr) with a content of praseodymium in the range of 0.04-9 at %. We have determined the composition of crystals, evaluated their optical quality, and found the incorporation coefficient of Pr ions into the NaYF matrix ( K ∼ 0.9). We have examined optical spectra of NaYF:Pr crystals at room and low (7 K) temperatures in the range of 200-2500 nm. The low-temperature absorption spectra of NYF:Pr crystals have been shown to consist of broad weakly structured bands. Based on the analysis of low-temperature absorption spectra, the structure of the Stark splitting of praseodymium levels has been represented in terms of a model of 'quasi-centers,' which are characterized by an inhomogeneous broadening of Stark components. From experimental absorption cross-section spectra at T = 300 K, we have calculated oscillator strengths for transitions from the ground state H to excited multiplets H, H, F ( j = 2, 3, 4), G, D, and ( P, I) ( j = 0, 1, 2). Using the Judd-Ofelt method, we have determined intensity parameters Ω and found that Ω = 0, Ω = 4.4 × 10, and Ω = 2.28 × 10 cm. With these values, we have calculated the probabilities of radiative transitions, the branching coefficients, and the lifetimes of the radiative levels D and P. The probabilities of multiphonon nonradiative transitions in NYF:Pr crystals have been estimated. Using the method of kinetic spectroscopy with selective excitation, we have investigated the luminescence decay kinetics of praseodymium from the P and D levels upon their selective resonant excitation by nanosecond laser pulses. The inference has been made that NaYF:Pr crystals are processable; admit doping by praseodymium in high concentrations; and, with respect to all their radiative characteristics, can be potentially considered as active media for converters of optical radiation and solid-state continuously tunable lasers in the visible range.
- Subjects
PRASEODYMIUM; SODIUM fluoride; METAL crystals; LUMINESCENCE spectroscopy; DOPING agents (Chemistry); CHEMICAL kinetics; METAL ions; OPTICAL quality control
- Publication
Optics & Spectroscopy, 2014, Vol 116, Issue 3, p392
- ISSN
0030-400X
- Publication type
Academic Journal
- DOI
10.1134/S0030400X14030229