Abstract Highly fluorescent Ag–In–S/ZnS (AIS/ZnS) core/shell quantum dots (QDs) with good crystallinity were synthesized via hydrothermal method with adding ZnS precursors directly into AIS cores initial solution. The influences of… Click to show full abstract
Abstract Highly fluorescent Ag–In–S/ZnS (AIS/ZnS) core/shell quantum dots (QDs) with good crystallinity were synthesized via hydrothermal method with adding ZnS precursors directly into AIS cores initial solution. The influences of shell growth time and Zn/AgIn ratios on the crystal structure, composition and morphology were analyzed by using X-ray diffraction (XRD) and high-resolution transmission electron microscope (HRTEM), and the fluorescence properties of AIS/ZnS core/shell QDs were systematically investigated by absorption and photoluminescence (PL) spectra. In contrast with AIS cores, the AIS/ZnS core/shell QDs showed significantly improved yellow-orange emission with long PL lifetimes, as well as the maximum quantum yield (QY) increased from 21.6% to 45.7%. Moreover, bright white light was successfully generated from the AIS/ZnS QDs and Lu 3 Al 5 O 12 :Ce 3+ phosphors based white light-emitting diode (WLED). Under the forward bias current of 200 mA, the fabricated WLED exhibited a high luminous efficiency of 77.98 lm/W with the Commission Internationale de I'Eclairage (CIE) color coordinate of (0.32, 0.32), a color rendering index (CRI) of 85 and the correlated color temperature (CCT) of 6215 K, demonstrating the prospective application of obtained QDs in solid-state lighting devices.
               
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