磁场对(C4H9NH3)2(CH3NH3)Pb2I7钙钛矿发光特性调控的研究

Control of magnetic field to luminescence characteristics in(C4H9NH3)2(CH3NH3)Pb2I7 perovskite

(C4H9NH3)2(CH3NH3)Pb2I7是一种Ruddlesden-Popper相钙钛矿材料,具有层状结构,层间通过van der Waals力结合,因此可以通过机械剥离的方法,获得其二维薄层。二维(C4H9NH3)2(CH3NH3)Pb2I7内束缚激子会自发复合从而表现出强的荧光,其圆极化率、峰位均受磁场调控。在外磁场中,荧光圆极化率与磁场呈线性关系,激子中电子和空穴之间的朗德因子差Δg约为0.43。束缚激子在磁场中受抗磁效应影响,致使其发光峰随磁场增加而红移。

(C4H9NH3)2(CH3NH3)Pb2I7 is a Ruddlesden-Popper phase perovskite material,has a layered structure,and the layers are combined by van der Waals forces.The two-dimensional layered perovskite can be obtained by mechanically exfoliated from bulk crystals,which display strong bound exciton spontaneous emission.The helicity parameter of the bound exciton is linear to the external magnetic field,giving rise to a giant Lande factor difference(Δg)of about 0.43 between the electron and hole of bound exciton.The antimagnetic effect leads to a redshift of bound exciton emission in magnetic field.