Synthesis and electroluminescence properties of Mn2+doped quasi-two-dimensional perovskites(PEA)2PbyMn1-yBr4
Mn2+-doped quasi-two-dimensional perovskite(PEA)2PbyMn1-yBr4(PEA is phenylethylamine,y is the frac-tion of Pb2+in the total content of Mn2+and Pb2+)thin films were prepared successfully with high photoluminescence quantum yield(PLQY).It constructed a dual-emissive excited state transfer system,while(PEA)2PbBr4 and impurity Mn2+respectively act as the donor and acceptor.Mn2+incorporation improved the luminescence properties and film morphologies.Using the femtosecond transient absorption(TA)measurement,we demonstrated the charge transfer processes between the host and the guest.To study the electroluminescence properties,(PEA)2PbyMn1-yBr4 film was employed as the active layer to fabricate LED(light emitting diodes,LEDs)devices.The(PEA)2PbyMn1-yBr4 LED device emitted a bright orange color,which demonstrated a maximum luminous intensity of 0.21 cd·m-2 with an external quantum efficiency(EQE)of 0.002 5％.
metal halide perovskitedopingcharge transferluminescence materialelectroluminescence
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