Synthesis, Fabrication, and Characterization of MAPbBr₃ Quantum Dots for LED Applications: An Easy Laboratory Practice

Currently, perovskites are one of the most explored frontier topics in research and industry due to their exceptional properties that make them a candidate for a wide range of applications, such as solar cells, sensors, and light emitting diodes (LEDs). On the other hand, one of the pedagogical problems is the lack of laboratory practices that can help students to relate the basic concepts of chemistry and physics with the fabrication and characterization process of an electronic device. In this work, a laboratory practice is proposed for undergraduate and postgraduate students in natural sciences and engineering to show an easy route of synthesis and characterization of the MAPbBr3 perovskite quantum dots (PQDs) and their application in LEDs. The step-by-step Ligand-Assisted Re-Precipitation (LARP) method is described for synthesis of luminescent efficient PQDs. A spin-coating method is used to fabricate active layers of perovskite LEDs under ambient conditions with a eutectic field metal as the top contact to avoid the use of expensive high vacuum systems. The positive feedback of the students toward this laboratory practice demonstrates the effective learning on the concept–application relationship through the fabrication and characterization of perovskite LEDs.