A novel borophosphate glass doped with Ho 2 O 3 and Bi 2 O 3 has been investigated. The efficient energy transfer process between Ho 3+ and bismuth ions is observed and the energy transfer efficiency is 47.8%. The enhanced broadband 2.0 μm emission with a full width at half maximum of 180 nm of Ho 3+ : 5 I 7 → 5 I 8 is obtained by codoping Bi 2 O 3 excited by a 445 nm laser diode. The emission properties and energy transfer mechanism of Ho 3+ sensitized by bismuth ions are discussed. The results indicate that this glass is a promising candidate for 2.0 μm laser material.
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Sheng et al. (2012) studied this question.
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