Compatible Crystallization Protocol of Mono-Dentate Ligands Cesium-Based Red Emitting Perovskite Quantum Dots
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초록
내용
Perovskite quantum dots (PQDs) show high yields compared to bulk due to their stable phase, and bright exciton triplet states properties. Recently, research on green- and blue-emitting materials among the three primary colors has been continuously reported, but research on red-emitting materials is lacking. In this works, we designed a method to synthesize pure red-emitting PQDs by controlling the ratio of mono-dentate ligands (octylamine-oleic acid) based on DMF polar solvent. In addition, it was confirmed that PQDs were synthesized within a specific range through a plot of compatible/incompatible synthesis conditions based on the LaMer model. Among them, PQDs with high iodine content showed a QY of 76.9% and strong PL intensity. It was confirmed that no discoloration occurred even after 90 h, 88% intensity of photoluminescence was maintained, and there was almost no change in the position of the CIE coordinates. This suggests a facile synthetic strategy to obtain high-quality red PQDs.