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Novel green phosphors Zn 3 Al 2 Ge 2 O 10 : Mn 2+  were successfully synthesised at high temperature under weak reducing atmosphere. X-ray diffraction results indicate that the samples have like-spinel structure. The morphology, chemical states, and the composition of the dopants in the host were analysed with high-resolution transmission electron microscopy, energy dispersive spectrum, high-angle annular dark-field, and X-ray photoelectron spectroscopic techniques. The photoluminescence spectra show that the emission peak is at 537 nm (under excitation at λ ex  = 334 nm), which is the strong green emission resulting from the  4 T 1  ( 4 G)- 6 A 1  ( 6 S) transition of Mn 2+  ion. The full width at half maximum broadband of the strongest broad emission is about 50 nm. The Zn 3 Al 2 Ge 2 O 10  doped with 4 mol% Mn 2+  appears to have the highest emission intensity after thermal treatment at 1250 °C for 5 h. The CIE coordinates are  x  = 0.279,  y  = 0.625, corresponding to green region, and the decay time is 4.88 μs. The results indicate that the phosphors may be used as a trichromatic fluorescent material.

Green Zn 3 Al 2 Ge 2 O 10 : Mn 2+ Phosphors: Solid-Phase Synthesis, Structure, and Luminescent Properties