Rapid synthesis of highly stable all-inorganic perovskite nanocrystals exhibiting strong blue luminescence

Abstract

With the development of blue-emitting all-inorganic Pb-based perovskite nanocrystals (NCs), the perovskite family (e.g., CsPbCl3−xBrx NCs) has drawn researchers’ attention. Although the hot injection method has been widely used to fabricate blue-emitting perovskite NCs, this synthesis method generally needs an inert gas atmosphere, high temperature, and localized injection operation, leading to high cost and limiting the applications of perovskite NCs. Herein, we synthesized mixed-halide blue-emitting CsPbCl3−xBrx (x = 0.0–2.5) perovskite NCs rapidly at room temperature. The as-prepared perovskite NCs exhibited excellent stability and high photoluminescence quantum yields up to 89% because of their low non-radiative recombination rate. The photoluminescence wavelength of the NCs was precisely regulated across the whole visible region (406–488 nm). Importantly, this facile method to synthesize perovskite NCs not only requires mild experimental conditions, dramatically lowering the cost of synthesis, but also provides a feasible route for the industrial production of efficient blue-emitting devices.