Narrowing the green emission of CsPbBr3 quantum dot glass via high fluorine doping strategy toward backlit displays

A high-fluorine doping strategy is proposed to improve the optical properties of CsPbBr 3 -containing glass. • A minimum FWHM of 19 nm is achieved, which is narrower than those of most reported CsPbBr 3 -containing glass systems. • AlF 3 incorporation enables modulation of the glass network and passivation of halide vacancies. • The application of the reported CsPbBr 3 -containing PQD glass in backlit displays is demonstrated. Narrow-band emission is essential for wide-color-gamut display applications; however, the emission bandwidth of perovskite quantum dots typically broadens upon embedding into glass matrices. Herein, we report a high‑fluorine-doping strategy to regulate crystallization behavior and optical performance of CsPbBr 3 -containing quantum dot glass toward high-performance backlit displays. High-concentration AlF 3 incorporation into borosilicate glass enables fluorine to modulate the glass network and passivate halide vacancies, thereby regulating CsPbBr 3 nanocrystal precipitation and suppressing defect-related trap states. As a result, the emission linewidth is narrowed from 24 to 19 nm, which is narrower than that of most reported CsPbBr 3 -containing glass systems. In addition, fluorine incorporation induces partial glass network depolymerization, promotes decrease in PQD size distribution, resulting in the observed spectral narrowing and redshift. The CsPbBr 3 -containing PQD glass exhibits good ultraviolet irradiation resistance, thermal reversibility up to 493 K, and strong exciton binding, demonstrating exceptional optical robustness. By modulating halide composition, full-visible-spectrum tunability from blue to green and red is achieved. This work provides a strategy for constructing spectrally pure and robust perovskite quantum dot glass, opening new opportunities for wide-color-gamut display applications. Download: Download high-res image (132KB) Download: Download full-size image