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Oxyfluoride glass-ceramics have become a focal point of recent research, positioned to advance significantly in areas such as LED illumination and optical data storage, etc. This study successfully prepared Pr3+-doped fluorosilicate glass and glass-ceramics embedded Na 5 Y 9 F 32 nanocrystals. The introduction of Pr 2 O 3 into the glass matrix disturbs the network structure, leading to a reduction in the band gap from 3.66 eV to 3.42 eV. When subjected to 443 nm light excitation, the 1.0 mol% Pr3+-doped glass-ceramics crystallized at 690 °C for 1.0 h exhibit the most potent luminescence, displaying seven emission peaks resulting from the radiative transition of Pr3+ ions, manifesting yellowish-pink hues. Furthermore, when stimulated by a 450 nm LD, the glass-ceramics display a distinct emission peak at approximately ∼247 nm, attributed to the electron transitions of 4 f 5 d → 3H 4 for Pr3+ ions. The luminescent properties of these glass-ceramics embedded with Na 5 Y 9 F 32 nanocrystals illustrate potential applications in up-conversion and down-conversion luminescence. • A novel Pr3+ doped SiO 2 –Al 2 O 3 –Na 2 O-NaF-YF 3 glass-ceramics was successfully prepared. • Glass-ceramics containing Na 5 Y 9 F 32 crystals exhibit efficient excitation under blue light. • The glass-ceramics exhibit yellowish-pink hues excited by 443 nm light. • The glass-ceramics presents impressive emission peaks at ∼247 nm excited by 450 nm LD. • The work stresses glass-ceramics' huge potential in up-/down-conversion luminescence. [ABSTRACT FROM AUTHOR]

[Display omitted] • Continuous synthesis of Cs x Pb y Br z NCs were realized via a microfluidic system. • Cs x Pb y Br z perovskite NCs with tunable dimensionalities were achieved. • Stable CsPbBr 3 /Cs 4 PbBr 6 composite NCs exhibited bright emissions in solid forms. • Growth and luminescence mechanisms of Cs x Pb y Br z perovskite NCs were revealed. All-inorganic perovskite CsPbBr 3 shows great potential in optoelectronic device applications due to their excellent optoelectrical properties. However, its practical use is still dauntingly plagued by the poor stability. Recently, its derivatives Cs 4 PbBr 6 and CsPb 2 Br 5 featured with good stability and the versatility in crystal structure have emerged as promising alternatives. Nevertheless, synthesizing such a series of perovskites through a facile, scalable, and high-yield method is challenging, and their luminescence mechanisms are still elusive. Herein, we reported a facile and rapid method for continuous synthesis of Cs x Pb y Br z -based perovskites (including Cs 4 PbBr 6 , CsPbBr 3 /Cs 4 PbBr 6 , CsPbBr 3 , CsPbBr 3 /CsPb 2 Br 5 , CsPb 2 Br 5) via a microfluidic system. The transformations of different dimensional perovskite nanocrystals were realized by simply adjusting the precursor flow rate. CsPbBr 3 /Cs 4 PbBr 6 and CsPbBr 3 /CsPb 2 Br 5 composite nanocrystals exhibited bright emissions in their solid forms, where CsPbBr 3 nanocrystals uniformly embedded in Cs 4 PbBr 6 or CsPb 2 Br 5 matrix. Simultaneously, strong green fluorescence exclusively from CsPbBr 3 nanocrystals was detected and related energy transfer in composite nanocrystals was further investigated. Finally, the highly stable CsPbBr 3 /Cs 4 PbBr 6 nanocrystals were used for the construction of WLED with a wide color gamut of 131% NTSC. This work provides a novel path for large-scale and controlled synthesis of the ternary Cs-Pb-Br materials for specific light-emitting applications. [ABSTRACT FROM AUTHOR]