CsCu₂I₃ Nanocrystals: Growth and Structural Evolution for Tunable Light Emission.

ABSTRACT: CsCu₂I₃ mixed with Cs₃Cu₂I₅ has shown potential applications as white-light-emitting materials, while their growth, structural evolution behaviors, and their impact on photoluminescence of CsCu₂I₃ nanocrystals (NCs) are still not known. In this work, we investigated the growth and structural evolution of CsCu₂I₃ nanocrystals with increasing reaction temperature. At low temperature and in the presence of a high dosage of oleic acid and oleylamine, Cs₃Cu₂I₅ nanoparticles, rather than CsCu₂I₃ NCs, preferred to form in the hot-injection reaction system. Increasing the reaction temperature promoted the formation of CsCu₂I₃ nanorods. Phase-pure CsCu₂I₃ nanorods were steadily obtained at 180 °C. Structural evolution from less copper-containing NCs to copper-rich ones in the low-temperature reaction condition is highly related to the coordination of copper ions with OAm. More importantly, accompanying the growth of nanorods and structural evolution from Cu₃Cs₂I₅ to CsCu₂I₃, the color of photoluminescence emission of NCs changed from blue to nearly white and to yellow, but their photoluminescence quantum yield decreased from 36.00 to 9.86%. The finding in this work would give a view to the structural evolution of copper-containing perovskite-like halides, being helpful for adjusting their photoluminescence in white LEDs.

SUBMITTER: Lu Y 

PROVIDER: S-EPMC7807798 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature