Abstract
Single crystal of holmium, ytterbium-codoped yttrium aluminum tetraborate Ho,Yb:YAl 3(BO 3) 4(Ho,Yb:YAB) has been grown by the flux method. The crystal structure still belongs to the space group R 32. The absorption spectra in the visible and NIR regions have been measured at room temperature; and fluorescence spectrum of Ho,Yb:YAl 3(BO 3) 4 crystal are also measured at room temperature excited by 976 nm laser. Not only the strong NIR emission peaks located at 1966 nm was observed, but also the visible upconversion luminescence has been found. The most strong upconversion luminescence of the Ho,Yb:YAl 3(BO 3) 4 crystal is 5S 5→ 5I 8 transition (570 nm), and that of 5F 5→ 5I 8 transition (652 nm) of Ho 3+ ion is 1.3 times smaller relatively. The mechanism of upconversion luminescence was discussed.
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