摘要
While perovskite light-emitting diodes typically made from high work function anode and low work function cathode have recently gained intense interests, we demonstrate perovskite light-emitting devices from two high work function electrodes with interesting features.Firstly, electroluminescence can be easily obtained from both forward and reverse biases.Secondly, the results of impedance spectroscopy indicate that the ionic conductivity in the iodide perovskite(CH_3NH_3PbI_3) is large with a value of ~10~(-8)Scm~(-1).Thirdly, the shift of the emission spectrum in the mixed halide perovskite(CH_3NH_3PbI_(3-x)Br_x) lightemitting devices indicates that I-ions are mobile in the perovskites.Fourthly, our work shows that the accumulated ions at the interfaces results in a large capacitance(~100 μFcm~(-2)).The above results conclusively prove that the organic–inorganic halide perovskites are solid electrolytes with mixed ionic and electronic conductivity and the light-emitting device is a light-emitting electrochemical cells.The work also suggests that the organic-inorganic halide perovskites are potential energy-storage materials, which may be applicable in the field of solid-state super capacitors and batteries.[1] [2]
While perovskite light-emitting diodes typically made from high work function anode and low work function cathode have recently gained intense interests, we demonstrate perovskite light-emitting devices from two high work function electrodes with interesting features.Firstly, electroluminescence can be easily obtained from both forward and reverse biases.Secondly, the results of impedance spectroscopy indicate that the ionic conductivity in the iodide perovskite(CH_3NH_3PbI_3) is large with a value of ~10~(-8)Scm~(-1).Thirdly, the shift of the emission spectrum in the mixed halide perovskite(CH_3NH_3PbI_(3-x)Br_x) lightemitting devices indicates that I-ions are mobile in the perovskites.Fourthly, our work shows that the accumulated ions at the interfaces results in a large capacitance(~100 μFcm~(-2)).The above results conclusively prove that the organic–inorganic halide perovskites are solid electrolytes with mixed ionic and electronic conductivity and the light-emitting device is a light-emitting electrochemical cells.The work also suggests that the organic-inorganic halide perovskites are potential energy-storage materials, which may be applicable in the field of solid-state super capacitors and batteries.[1] [2]
引文
[1]Y.Zhao,C.Liang,H.Zhang,et.al,“Anomalously large interface charge in polarity switchable photovoltaic devices:an indication of mobile ions in organic–inorganic halide perovskites”Energy&Environmental Science,8(4):1256-1260(2015).
[2]H.Zhang,H.Lin,C.Liang,et.al,“Organic–Inorganic Perovskite Light-Emitting Electrochemical Cells with a Large Capacitance”Advanced Functional Materials,25:7226–7232(2015).