High-efficiency fluorescence radiation of Dy3+ in alkaline earth borate glasses

Dy3+-doped alkaline-earth borate glasses (LKZBSB) with high quantum yield and multifarious emission channels have been fabricated and efficient warm yellowish-white fluorescence is presented under UV light excitation. Judd-Ofelt parameters Ω2=5.36×10−20 cm2, Ω4=1.46×10−20 cm2 and Ω6=1.95×10−20 cm2 indicate a high asymmetrical and covalent environment in the optical glasses. The maximum stimulated emission cross-sections σem-max corresponding to the 4F9/2→6H15/2, 4F9/2→6H13/2, 4F9/2→6H11/2 and 4F9/2→(6H9/2, 6F11/2) transitions are derived to be 2.64×10−22, 20.07×10−22, 3.45×10−22 and 9.31×10−22 cm2, respectively, and the relevant spontaneous emission probabilities Arad are 174.08, 616.07, 68.95 and 87.10 s−1. Quantitative characterization reveals that Dy3+-doped LKZBSB glasses exhibit a quantum yield as high as 16.65%, confirming that the effectiveness of the warm yellowish-white luminescence in Dy3+-doped LKZBSB glasses. Multifarious emission channels and high quantum yield illustrate the great advantages of Dy3+-doped LKZBSB glasses in developing fiber-lighting sources, display devices, tunable visible lasers, and optical signal amplifiers.