Lead-free copper-based quantum dots (QDs)/nanocrystals (NCs) with a facile preparation method and low price are promising candidates for replacing traditional expensive phosphors for applications in white light-emitting diodes (W-LEDs). In this article, the strategy of secondary excitation of red CIS/ZnS core-shell QDs using green CsCuCl NCs and blue CsCuI NCs was employed. UV-excited W-LEDs with a unique (GB)R layered structure was successfully prepared using green CsCuCl NCs, blue CsCuI NCs and red CIS/ZnS core-shell QD composite materials with different luminescence wavelengths. At the same time, the properties of the synthesized CuInS (CIS) QDs, CuInS/ZnS core-shell QDs and CsCuX (X = C1, Br, I) NCs were characterized and the effect of myristic acid (MA) on the optical properties was discussed. This study has an important reference significance on how to use three different quantum dots/nanocrystals to fabricate W-LEDs.
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