Growth and spectroscopic properties of Tm3+-doped La2CaB10O19 crystal

Highlights: • A Tm³⁺: LCB crystal has been grown by the top-seeded solution growth method . • The spectral parameters were calculated according to the Judd−Ofelt theory. • The emission of 777 nm has a moderate emission cross section under the excitation of 466 nm. Tm³⁺-doped La₂CaB₁₀O₁₉ (Tm³⁺: LCB) crystal with dimensions of 40 × 16 × 14 mm³ has been grown by the top-seeded solution growth (TSSG) method. At room temperature, the absorption spectrum in the wavelength range of 190–2000 nm and emission spectrum under the excitation of 466 nm were measured by using ($110$) oriented crystal wafers. According to the Judd−Ofelt theory, the fundamental spectral parameters were calculated, including phenomenological intensity parameters ${\Omega }_t$ (t = 2, 4, 6), transition probability A, emission cross sections σ_em, fluorescence branch ratio β_c, and radioactive lifetime τ_rad. Tm³⁺: LCB crystal may be a potential near infrared laser material under the excitation of 466 nm which is closed to the wavelength of GaN laser diode.