We have investigated the synthesis

luminescence and time-resolved fluorescence decay spectra for Zn

2

GeO

4

:

x

Mn phosphors doped with different contents of Mn

2+

as an activator. The microstructure of Zn

2

GeO

4

:

x

Mn samples is highly dependent on synthetic conditions. The observed red shift in

em

from 527nm to 534nm with increasing Mn

2+

content has been investigated and rationalized by the presence of a weak crystal field due to the substitution of Zn

2+

by Mn

2+

which leads to a distorted tetrahedral lattice site. The CIE chromaticity coordinates were found to shift slightly with variation of doped Mn

2+

content. Time-resolved fluorescence decay curves of Zn

2

GeO

4

:

x

Mn have also been investigated. Interestingly

the shortening of fluorescence decay lifetime observed in Zn

2

GeO

4

:

x

Mn phosphors with increasing Mn

2+

dopant concentration has been rationalized by the alteration of transition probability as a consequence of magnetic interaction between Mn

2+

-Mn

2+

pairs in the host lattice.