Eu 2+ ‐Activated Osumilite‐Type Glass‐Ceramics for High‐Power White Lighting: Low‐Barrier Crystallization Driven by Topological Homology

ABSTRACT High‐power white light‐emitting diodes (w‐LEDs) urgently require luminescent materials with excellent thermal stability and high color rendering, while conventional phosphors suffer severe luminescence quenching under high‐power excitation. Although aluminosilicate glass‐ceramics (GCs) are promising all‐inorganic emitters, their crystallization regulation is hindered by unclear atomic‐scale disorder‐to‐order transformation mechanisms. Herein, we report Eu 2+ ‐activated osumilite‐type BaMg 2 Al 6 Si 9 O 30 GCs with superior photoluminescence performance, which are selectively crystallized via topological homology between precursor glass network and target crystal lattice. Molecular dynamics simulations verify that moderately depolymerized aluminosilicate tetrahedral frameworks persist during phase transition, yielding a low crystallization‐activation energy of 239.3 kJ/mol and 3D‐diffusion‐dominated crystal growth. The rigid lattice confines Eu 2+ centers, delivering an absolute quantum yield of 74% and 90.4% emission retention at 420 K. High‐power w‐LEDs based on this GC realize a color‐rendering index of 95.9 with negligible chromatic shift (1–10 W). Its broad‐band blue emission matches chlorophyll absorption, enabling plant‐growth lighting. This work demonstrates topological homology as an effective crystallization‐tuning strategy and highlights osumilite GCs for high‐power solid‐state and agricultural lighting.