I–III–VI type semiconductor
nanocrystals (NCs) have
attracted considerable attention in the display field. Herein, we
realized the synthesis of narrow-bandwidth blue-emitting Ag–Ga–Zn–S
(AGZS) NCs via a facile one-pot method. Intriguingly, the Ag/Zn feeding
ratio and Ag/Ga feeding ratio are crucial for the realization of narrow-bandwidth
AGZS NCs. By choosing a Ag/Zn feeding ratio of 4:1 and Ag/Ga feeding
ratio of 1:8, AGZS NCs demonstrate a typical blue emission at 470
nm with a narrow full width at half-maximum (fwhm) of 48 nm, which
is mainly generated from the band-to-hole recombination rather than
the donor–acceptor pair (DAP) recombination. Furthermore, a
solution-processed quantum-dot light-emitting device based on AGZS
NCs exhibits a narrow electroluminescent bandwidth of 53 nm and high
luminance over 123.1 cd m–2, as well as a high external
quantum efficiency (EQE) of 0.40%. Our work highlights AGZS NCs with
high color purity as an important candidate for blue-light-emitting
devices.
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