Abstract
The preparation of highly efficient perovskite nanocrystal light-emitting diodes is shown. A new trimethylaluminum vapor-based crosslinking method to render the nanocrystal films insoluble is applied. The resulting near-complete nanocrystal film coverage, coupled with the natural confinement of injected charges within the perovskite crystals, facilitates electron-hole capture and give rise to a remarkable electroluminescence yield of 5.7%.
Highlights
Metal-halide perovskite semiconductors have attracted significant research interest, due to a combination of low-cost solution processability and remarkable performance in optoelectronic devices.[1,2] In 2014, we demonstrated infrared and visible electroluminescence in methylammonium lead halide perovskites, using a charge-confined diode structure to achieve effective radiative recombination.[2,3,4] the use of methylammonium halide, which is a chemical combination of gaseous methylamine and hydrogen halide, necessarily limits the thermal stability of these perovskite devices
Due to the presence of aliphatic ligands on the nanocrystals, the perovskite film remains soluble to organic solvents, which limits the deposition of subsequent chargeinjection layers using solution methods
The photoluminescence spectra of the nanocrystals remain unchanged after the TMA treatment, confirming that the crosslinking has no effect on their optical bandgap. (Note that we use a slightly modified TMA treatment procedure for the blue-emitting nanocrystals—see Figure S1, Supporting Information.)
Summary
Metal-halide perovskite semiconductors have attracted significant research interest, due to a combination of low-cost solution processability and remarkable performance in optoelectronic devices.[1,2] In 2014, we demonstrated infrared and visible electroluminescence in methylammonium lead halide perovskites, using a charge-confined diode structure to achieve effective radiative recombination.[2,3,4] the use of methylammonium halide, which is a chemical combination of gaseous methylamine and hydrogen halide, necessarily limits the thermal stability of these perovskite devices. Due to the presence of aliphatic ligands on the nanocrystals, the perovskite film remains soluble to organic solvents, which limits the deposition of subsequent chargeinjection layers using solution methods.
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