Abstract

A series of Ce³⁺, Sm³⁺-doped Zn₂GeO₄ phosphors are prepared by the solid-state reaction. A blue photoluminescence (PL) of Zn₂GeO₄ is observed as the recombination of the electrons trapped on VO• and Zni• with holes trapped on V_Ge and VZn′. The energy transfer process between Ce³⁺ and Sm³⁺ is confirmed by the PL spectra and decay curves, and the emission colors can be adjusted from blue to orange–red. Furthermore, we verify unambiguously that the energy transfer from Ce³⁺ to Sm³⁺ occurs. Besides, Ce³⁺ ions can act as a bridge, possibly promoting the energy transfer from the Zn₂GeO₄ host matrix to Sm³⁺ ions.

© 2017 Chinese Laser Press

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