Superluminescent Halide Perovskite Light-Emitting Diodes with a Sub-Bandgap Turn-On Voltage

Abstract

An emissive perovskite ternary composite thin film comprising a perovskite material, an ionic-conducting polymer and an ionic-insulating polymer is provided. Additionally, a single-layer LEDs is described using a composite thin film of organometal halide perovskite (Pero), an ionic-conducting polymer (ICP) and an ionic-insulating polymer (IIP). The LEDs with Pero-ICP-IIP composite thin films exhibit a low turn-on voltage of about 1.9V (defined at 1 cd m−2 luminance) and a luminance of about 600,000 cd m−2.

What is claimed is: 
     
         1 . A method for manufacturing a single-layer optoelectronic device, the method comprising:
 forming a perovskite material;   adding an ionic-conducting polymer to the perovskite material to form a perovskite and ionic-conducting polymer mixture;   adding an ionic-insulating polymer to the perovskite and ionic-conducting polymer mixture to form a perovskite ionic-conducting polymer and ionic-insulating polymer mixture;   coating a substrate with the perovskite ionic-conducting polymer and ionic-insulating polymer mixture to form a thin-film layer on the substrate; and   annealing the thin-film layer.   
     
     
         2 . The method of  claim 1 , wherein the perovskite material is cesium lead tribromide (CsPbBr 3 ), the ionic-conducting polymer is PEO (poly(ethylene oxide)), and the ionic-insulating polymer is PVP (poly(vinylpyrolidone)). 
     
     
         3 . The method of  claim 1 , wherein the perovskite material is an organometal halide perovskite material. 
     
     
         4 . The method of  claim 1 , wherein the perovskite material is a methylammonium lead halide (CH 3 NH 3 PbX 3 ). 
     
     
         5 . The method of  claim 1 , wherein the perovskite material is selected from the group consisting of cesium lead halide (CsPbX 3 ) and cesium lead tribromide (CsPbBr 3 ). 
     
     
         6 . The method of  claim 1 , wherein the ionic-conducting polymer is PEO (poly(ethylene oxide)). 
     
     
         7 . The method of  claim 1 , wherein the ionic-insulating polymer is PVP (poly(vinylpyrolidone)). 
     
     
         8 . The method of  claim 1 , wherein the perovskite material comprises lead tribromide (PbBr 3 ) and cesium bromide (CsBr) in a solution of dimethylformamide or dimethylsulfoxide. 
     
     
         9 . The method of  claim 1 , wherein the perovskite material comprises lead tribromide (PbBr 3 ) and cesium bromide (CsBr) in a solution of dimethylsulfoxide (DMSO) at a molar ratio of about 1:1.5. 
     
     
         10 . The method of  claim 1 , wherein the ionic-conducting polymer is PEO, and the ionic-insulting is PVP, wherein the PEO and the PVP are dissolved in dimethylformamide (DMF).