%ATan, Qishuo%ALuo, Weijun%ALi, Tianshu%ACao, Jun%AKitadai, Hikari%AWang, Xingzhi%ALing, Xi%BJournal Name: Applied Physics Reviews; Journal Volume: 9; Journal Issue: 4 %D2022%I %JJournal Name: Applied Physics Reviews; Journal Volume: 9; Journal Issue: 4 %K %MOSTI ID: 10389761 %PMedium: X %TCharge-transfer-enhanced dd emission in antiferromagnetic NiPS 3 %XThe d electron plays a significant role in determining and controlling the properties of magnetic materials. However, the d electron transitions, especially d– d emission, have rarely been observed in magnetic materials due to the forbidden selection rules. Here, we report an observation of d– d emission in antiferromagnetic nickel phosphorus trisulfides (NiPS 3 ) and its strong enhancement by stacking it with monolayer tungsten disulfide (WS 2 ). We attribute the observation of the strong d– d emission enhancement to the charge transfer between NiPS 3 and WS 2 in the type-I heterostructure. The d– d emission peak splits into two peaks, D 1 and D 2 , at low temperature below 150 K, from where an energy splitting due to the trigonal crystal field is measured as 105 meV. Moreover, we find that the d– d emissions in NiPS 3 are nonpolarized lights, showing no dependence on the zigzag antiferromagnetic configuration. These results reveal rich fundamental information on the electronic and optical properties of emerging van der Waals antiferromagnetic NiPS 3 . %0Journal Article