Full coverage all-inorganic cesium lead halide perovskite film for highefficiency light-emitting diodes assisted by 1,3,5-tri(m-pyrid-3-yl-phenyl)benzene

A full coverage all-inorganic cesium lead halide perovskite CsPbBr3 film is achieved by introducing a small organic molecule material, 1,3,5-tri(m-pyrid-3-yl-phenyl) benzene (TmPyPB), as a solution additive. The light-emitting diode (LED) using this CsPbBr3: TmPyPB perovskite film as light emitting layer exhibit improved electroluminescent (EL) performance with the maximum brightness of 22309 cd/m(2), highest current efficiency of 8.77 cd/A, and external quantum efficiency (EQE) of 2.27%, which are 8.6, 10.2 and 10.3 times to that of neat CsPbBr3 film based LED, respectively. The enhanced EL performances are ascribed to less current leakage due to full coverage, and improved electron transporting in the CsPbBr3: TmPyPB perovskite film. (C) 2017 Elsevier B.V. All rights reserved.