Advancing Scalability and Sustainability of Perovskite Light‐Emitting Diodes Through the Microwave Synthesis of Nanocrystals

Abstract

In recent years, perovskite light‐emitting diodes have witnessed a remarkable evolution in both efficiency and luminance levels. Nonetheless, the production of such devices typically relies on protracted synthesis procedures at elevated temperatures and vacuum/inert conditions (e.g. hot‐injection synthesis), thus rendering them technically unsuitable for extensive display and/or lighting applications manufacturing. Although alternative synthetic protocols have been proposed, e.g. ligand‐assisted reprecipitation, ultrasonic and microwave‐based methods, their suitability for the construction of high‐performing light‐emitting diodes has been reported in only a few studies. In this study, we demonstrate the fabrication of highly efficient lighting devices based on CsPbBr3 colloidal perovskite nanocrystals synthesized by a fast, energetically efficient, and up‐scalable microwave‐assisted method. These nanocrystals exhibit an impressive photoluminescence quantum yield of 66.8% after purification, with a very narrow PL spectrum centered at 514 nm with a full width at half‐maximum of 20 nm. Similarly, the PeLEDs achieve a maximum external quantum efficiency of 23.4%, a maximum current efficiency of 71.6 Cd A−1, and a maximum luminance level that exceeds 4.7 × 104 Cd m−2. Additionally, a significantly lower energy consumption for microwave‐mediated synthesis compared with hot injection is demonstrated. These findings suggest that this synthetic procedure emerges as an outstanding and promising method towards a scalable and sustainable fabrication of high‐quality perovskite light‐emitting diodes.