Abstract

Tb³⁺ and Sn²⁺ co-doped strontium phosphate glasses are prepared and their unique photoluminescence (PL) properties for deep UV excitation are investigated. With the co-doped Sn²⁺ ions, Tb³⁺ keeps the original PL behaviors under near UV excitation while its PL action for deep UV excitation is enhanced tremendously. PL emission and excitation spectra demonstrate the sensitization role of Sn²⁺ on the Tb³⁺ emissions for deep UV excitation that is associated with the strong deep UV absorption of Sn²⁺ for greatly enhancing the resonance of the Tb³⁺ excitation with the deep UV light source. The decay curves of Sn²⁺ and Tb³⁺ emissions for both singly doped and co-doped samples are single exponentially well fitted with almost the same emission lifetime (τ) values in the microsecond and millisecond time regimes, respectively, confirming that Sn²⁺ and Tb³⁺ act as an independent activator in the present phosphate glass matrix while an involved energy transfer from Sn²⁺ to Tb³⁺ is radiative. Moreover, Sn²⁺ and Tb³⁺ can be co-excited with deep UV light to emit tunable light from blue to green with the definite CIE chromaticity coordinate for different applications.

© 2016 Chinese Laser Press

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