Enhancing photoluminescence quantum yield and stability of CsPbCl3 nanocrystals through deep eutectic solvent synthesis: a green approach for optoelectronic applications | Poster Board #392

Despite its potential, CsPbCl₃ faces challenges in its application in blue light-emitting diodes (LEDs) due to its low photoluminescence quantum yield (PLQY). This paper presents a new method using a deep eutectic solvent (DES) for CsPbCl₃ synthesis, replacing toxic solvents like octadecene (ODE) and trioctylphenyl oxide (TOPO) and simplifying the process. These nanocrystals (NCs) also exhibit exceptional stability, maintaining their initial PLQY values over 90 days. This environmentally friendly approach offers NCs superior optical characteristics and stability, promising various optoelectronic applications. Employing a modified hot-injection approach, CsPbCl₃ NCs were synthesized using DES, eliminating the need for traditional co-solvents like TOPO. The DES-synthesized NCs showed a tenfold increase in PLQY compared to those synthesized in ODE, with no post-synthetic treatments required. Furthermore, the DES-synthesized NCs demonstrated enhanced stability under UV irradiation, retaining 76% of their original PLQY after 2 hours of exposure, compared to the 30% retention observed in ODE-synthesized NCs. Additionally, the thermal stability of the NCs was assessed, revealing that CsPbCl₃ synthesized in ODE retained only 30% of its photoluminescence after 10 hours of continuous heating at 90 degrees, whereas CsPbCl₃ synthesized in DES retained 42% of its initial photoluminescence under the same conditions. These findings highlight the promising potential of DES-mediated synthesis in improving the performance and stability of cesium lead halide perovskite NCs for optoelectronic applications.