Optical Spectroscopy of the Nd3+ Luminescence Centres in the Sr4B14O25:Nd Crystal

B.V. Padlyaka,b, W. Ryba-Romanowskic, R. Lisieckic, Yu.S. Oseledchikd, A.L. Prosvirnind, D.P. Kudryavtcevd and N.V. Svitankod a Institute of Physical Optics, 23 Dragomanov Str., 79005 Lviv, Ukraine b University of Zielona Góra, Institute of Physics, Szafrana 4a, 65-516 Zielona Góra, Poland c Institute of Low Temperatures and Structure Research, Polish Academy of Sciences, Okólna 2, 50-422 Wrocław, Poland d Zaporizhya State Engineering Academy, 226 Lenin Ave., 69006 Zaporizhya, Ukraine

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Optical absorption, emission and luminescence kinetics of Nd3+ centres in the new borate crystal with Sr4B14O25:Nd (Nd content 0.2 wt.%) composition are investigated and analysed. The oscillator strengths (Ptheor and Pexp) for observed absorption transitions and phenomenological intensity parameters Ωpt (Ωp2=1.59×10-20 cm-1, Ωp4 = 2.06 × 10-20 cm-1, and Ωp6 = 2.28 × 10-20 cm-1 were calculated based on the standard Judd-Ofelt theory. Using Ωpt parameters the radiative transitions rates (Wr), branching ratios (β) and radiative lifetime (τrad) for Nd3+ centres in the Sr4B14O25:Nd crystal were calculated and analysed. Measured lifetime (τexp = 105 and 93 μs at T = 10 and 300 K, respectively) is compared with this calculated (τrad = 331 μs) and quantum efficiency for Nd3+ centres from 4F3/2 emitting level in the Sr4B14O25:Nd crystal is estimated (η ≅ 30%). Incorporation peculiarities and local structure of Nd3+ luminescence centres in the Sr4B14O25 crystal and corresponding glass with 4SrO-7B2O3 composition are discussed on the basis of referenced diffraction data and presented results.

DOI: 10.12693/APhysPolA.117.104 PACS numbers: 42.70.-a, 78.40.Ha, 78.55.Hx, 78.20.Bh