Abstract
A near infrared to visible blue, green, and red upconversion luminescence in a Tb 3+-doped CaO-Al 2O 3-SiO 2 glass was studied, which was excited using 800 nm femtosecond laser irradiation. The upconversion luminescence was attributed to 5D 3 → 7F 5, 5D 3 → 7F 4, 5D 3 → 7F 3, 5D 4 → 7F 6, 5D 4 → 7F 5, 5D 4 → 7F 4, and 5D 4 → 7F 3 transitions of Tb 3+. The relationship between upconversion luminescence intensity and the pump power indicated that a three-photon simultaneous absorption process was dominant in this upconversion luminescence. The intense red, green, and blue upconversion luminescence of Tb 3+-doped CaO-Al 2O 3-SiO 2 glass may be potentially useful in developing three-dimensional display applications.
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