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Giant luminescence enhancement in Li2MSiO4:Eu2+ (M = Sr, Ba) via two-step synthesis and charge compensation
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DOI：10.1016/j.jre.2026.07.026.png)
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Abstract
En 中文
Eu2+-activated phosphors are prominent candidates for next-generation solid-state lighting, but their performance is often limited by incomplete Eu3+ reduction and poor thermal stability. Herein, we present a universal strategy combining a two-step synthesis with charge compensation to simultaneously stabilize Eu2+ centers and suppress parasitic Eu3+. Initially, M2SiO4:Eu2+ (Pnma) precursors were synthesized to promote effective Eu2+ incorporation. Subsequent P5+ co-doping induces charge-compensated substitution (Si4+→P5+). This structural evolution yields the target phosphor phases: the yellow-emitting Li2SrSi0.96P0.04O4:Eu2+ (P3121) and the green-emitting Li2BaSi0.96P0.04O4:Eu2+ (P63cm) with excitation/emission maxima at 394/580 and 365/520 nm, respectively. Importantly, the heterovalent substitution facilitates the Eu3+→Eu2+ reduction and optimizes the defect distribution. Consequently, the photoluminescence quantum yield (PLQY) is significantly enhanced from 26% to 78% for Li2SrSi0.96P0.04O4:Eu2+ and from 32% to 83% for Li2BaSi0.96P0.04O4:Eu2+, along with improved thermal stability (93.3%@450 K). Fabricated near-UV pumped white light-emitting diodes (LEDs) incorporating these phosphors demonstrate superior color rendering (Ra = 91.1) and stable electroluminescence across varying currents. The robust Eu2+ stabilization and charge compensation paradigm paves the way for rational design of high-performance phosphors for advanced lighting.
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