Photoluminescence quantum yield and Effective exciton radiative lifetime in monolayer transition metal dichalcogenides

The discovery of graphene and its fascinating properties [1] motivates new research fields in two-dimensional (2D) atomically thin-layered materials. The semiconductor transition metal dichalcogenides (TMDs) with chemical formula of MX2, (M = Mo, W; X = S, Se, Te) have attracted great research interest due to its intriguing properties [2,3]. It is very crucial to know the photoluminescence (PL) quantum yield and exciton radiative lifetime of this material in both viewpoint of research and opto-electronic device applications [4].