Indexed on: 22 Jul '17Published on: 22 Jul '17Published in: Analytical Chemistry
Halide perovskite materials have emerged as a new class of revolutionary photovoltaic and optoelectronic nanomaterials. However, the study on electrochemiluminescence (ECL) from halide perovskite nanomaterials is still in its infancy due to their instability, sensitivity, and difficulties in purification and film formation. Here we propose a scraping coating method for the fabrication of high-quality halide perovskite quntum dot (QD) film on electrode, which shows dense and uniform packing with minimum grain size. Taking CsPbBr3 QDs as model materials, highly efficient ECL can be obtained from such perovskite QD film with anhydrous ethyl acetate as both electrolyte and co-reactant. The CsPbBr3 QD film displays intense and stable ECL with ultra-narrow emission spectrum bandwidth (24 nm). The CsPbBr3 QD film shows an extremely high ECL efficien-cy which is up to 5 times relative to the standard Ru(bpy)32+/ tri-n-propylamine system. This approach is universal and also applies to hybrid organic-inorganic halide perovskite QDs. This work not only extends the properties and applications of halide perovskite materials, but also provides a new method for the in-depth study on the structure and properties of this kind of materials.