The Synthesis and Photoluminescence Properties of Novel Sr₈(Al₁₂O₂₄)(WO₄)₂: Eu²⁺ Green‐Emitting Phosphors for White LEDs

Phosphors, as the crucial material of phosphor‐converted white light‐emitting diodes (pc‐WLEDs), have played an essential role in improving luminescent efficiency and regulating color rendering index (CRI). Hence, we have successfully synthesized a novel Eu 2+ doped Sr 8 (Al 12 O 24 )(WO 4 ) 2 (SAWO) green phosphor for the first time using the solid‐state reaction, as well as systematically investigated its phase and crystal structure, luminescent properties, and thermal stability. The SAWO: x mol%Eu 2+ (0.1 ≤ x ≤ 1.0) phosphors were confirmed to be pure phase through XRD Rietveld refinement. The excitation spectrum of SAWO:Eu 2+ monitored at 516 nm exhibited a wide band from 250 to 450 nm, which is well matched with the PL spectrum for near‐ultraviolet chips. Furthermore, it can be known that three distinct Sr 3+ sites in as‐synthesized samples are occupied by Eu 2+ to form a broad emission band of 430–650 nm by the analysis of the crystal structure and spectra. Meanwhile, the optimal doping concentration of Eu 2+ is 0.3 mol%, and the concentration quenching mechanism is electric dipole–dipole interactions. Additionally, the SAWO:Eu 2+ phosphor shows higher color purity (82.0%) and excellent activation energy ( ΔE = 0.312 eV). These results demonstrate that the SAWO:Eu 2+ has remarkable potential as the green ingredient in a tricolor phosphor excited by near‐ultraviolet in pc‐WLEDs.