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Controlled Copper Content in CuZnInGaS Nanocrystals for Full-Visible Emitters
Yue Qin1, Siyao Niu1, Xuerong Song1
1Key Laboratory of Physics and Technology for Advanced Batteries, Ministry of Education, College of Physics, Jilin University, Changchun 130012, China.
Abstract:
CuZnInGaS nanocrystals were synthesized by magic-sized cluster-mediated growth. The precise copper content (0.2-20 at. %) and stoichiometric control enable tunable emission (479-671 nm) with narrow full width at half-maximum line widths for 93-105 nm. Trace copper (<5 at. %) passivates sulfur vacancies while inhibiting Zn2+/Cu+ exchange, achieving a record 91% photoluminescence quantum yield with the ZnS shell coating. The resulting quantum dot light-emitting diodes (QLEDs) exhibit record-low on-voltage (2.4 V) and record-breaking ultrahigh brightness (1802 cd/m2), making CZIGS/ZnS a promising candidate for next-generation displays and bioimaging.
