Researchers from Zhejiang University and Wenzhou University have developed a new strategy to reconcile high luminance and high photoluminescence quantum yield (PLQY) in perovskite nanocrystal (PNC)‑based glass composites - a key challenge hindering commercial application of next‑generation display technologies.
By introducing fluoride ions through NaF doping, the team successfully modified the glass network to optimize crystallization behavior of all‑inorganic CsPbX₃ (X = Cl, Br, I) PNCs, achieving both full‑spectrum emission and superior optical performance. The fluoride ions depolymerize the originally compact three‑dimensional glass network, lowering the glass transition temperature and creating a favorable micro‑environment for PNC nucleation and growth. This structural modification enables precise control of crystallization and minimizes self‑absorption, resulting in high‑quality nanocrystals uniformly embedded within the transparent matrix.
The emission wavelength of the glass composites can be continuously tuned from approximately 459 nm (blue) to 663 nm (red). Samples optimized for RGB display applications exhibited remarkable PLQY values of 36.0% (479 nm, blue), 78.3% (510 nm, green), and 72.4% (648 nm, red). Notably, the 36% PLQY achieved for pure‑blue emission (< 480 nm) represents a record high for PNCs‑glass systems - addressing one of the most persistent materials bottlenecks in full‑color display development.
Leveraging these high‑performance luminescent glasses, the researchers constructed a dynamic holographic multicolor display system integrating computer‑generated holography (CGH) and a spatial light modulator (SLM). Excited by a single 405 nm laser wavelength, this system achieved an exceptional pixel density of up to 20,247 pixels per inch (PPI) - demonstrating the feasibility of ultrahigh‑resolution holographic imaging using a simple optical configuration.
Beyond this, the team proposed a vertically stacked full‑color architecture using sequentially layered RGB emissive glasses. By adjusting the laser focal depth and phase pattern, selective excitation of color layers is possible, effectively transforming conventional planar sub‑pixel layouts into a three‑dimensional stacking format. This innovation eliminates the light‑utilization losses typical of color filters and dramatically enhances spatial efficiency, enabling full‑color resolution comparable to monochrome displays.
With its high PLQY, strong environmental stability, and outstanding optical tunability, this fluoride‑doped PNCs‑glass composite offers a robust platform for next‑generation display technologies, including energy‑efficient, ultra‑dense holographic and wearable micro‑displays. The work points toward a promising path for achieving full‑spectrum, high‑resolution multicolor displays driven by a single excitation wavelength.
