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Semiconductor quantum dots (QDs) materials have shown great potential for applications in lighting and display fields due to their wide color gamut, adjustable emission wavelength, high quantum efficiency, high color saturation, and low processing cost. For example, QD materials based on cadmium and perovskite have made remarkable progress, but the use of toxic Cd and Pb has limited their further application.

The Restriction of Hazardous Substances (RoHS) regulation clearly limits the use of Cd and Pb in electronic products to less than 100 ppm and 1,000 ppm, respectively. Therefore, developing new environmentally friendly quantum dot material systems is of great significance.

In recent years, eco-friendly I-III-VI2 QDs, such as Ag-In-Ga-S (AIGS) QDs, have attracted widespread attention due to their large Stokes shift, controllable emission over the entire visible spectrum, and high photoluminescence quantum yield (PLQY).

They show great potential in the fields of lighting and display. Due to the diverse element composition of AIGS, it typically exhibits a broad emission spectrum in the visible range, accompanied by a strong bandgap main emission peak and a weak defect emission peak.

Currently, researchers mostly focus on narrowing the PL spectrum through core-shell structures or alloying to meet the requirements of display. However, the dual emission characteristic of QDs with a wide spectrum in white light applications has obvious advantages, allowing for the realization of single-material white light-emitting devices (WLEDs), avoiding the disadvantages of complex processes, self-absorption, and poor color rendering of multiple fluorescent powder compound white light.

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