Photoluminescence in wide band gap corundum Mg
4
Ta
2
O
9
single crystals
Li Liang
, Zheng Yu-Lu
, Hu Yu-Xin
, Li Fang-Fei
, Zhou Qiang
†
, Cui Tian
Plot of
n
and (
n
2
– 1)
−1
versus
E
2
of Mg
4
Ta
2
O
9
.
