In Situ Glass Crystallization Enables Narrowband Blue Luminescence for Full-Spectrum Lighting and Transparent Display

Currently, narrowband light-convertor is critically urgent for preeminent color representation in lighting and display fields, however, the development of target materials still remains challenging. Herein, glass ceramic (GC) composite based on in situ glass crystallization, where the condense glass network structure acts as effective obstructors for long distance ion diffusion, is elaborately designed to inhibit activators' multi-sites occupation for acquiring narrowband emitting. Following this strategy, an unprecedented narrowband blue emission of Eu2+-activators with a peak at 447 nm and full-width of half maximum (FWHM) of approximate to 30 nm is developed in a new type of Sr5(PO4)3Cl (SPOCl) GC composite. The Eu2+-activators' hindered diffusion inside the GC composite makes preferential and limit occupation of the [Sr1O9] sites, enabling narrowband blue luminescence. Furthermore, the GC composite highlights remarkable performance in high-power violet-excitable full-spectrum lighting and transparent display (TD) prototype fields, due to its high color purity (approximate to 98.1%), photoluminescence quantum field (PLQY, approximate to 80.5%) and thermal stability (approximate to 82.1%@150 degrees C). This work not only promotes the profound understanding of the relationship between light manipulation and glass crystallization, but also paves the way toward the implementation of high-quality lighting and display of GC composites. A narrowband blue emission of Eu2+-activators with full-width of half maximum of approximate to 30 nm is developed in a new type of Sr5(PO4)3Cl glass ceramics, benefiting from the impeding role of glass network for ion diffusion. It is the Eu2+-activators' hindered diffusion inside the GC composite that makes preferential and limit occupation of the [Sr1O9] sites, enabling narrowband blue luminescence.image