Synthesis and luminescent properties of Sr3Al2O5Cl2: Eu2+, Dy3+ rod-like nanocrystals

Highlights: • Sr₃Al₂O₅Cl₂: Eu²⁺, Dy³⁺ has been successfully synthesized with rod-like nanocrystals. • Sr₃Al₂O₅Cl₂: Eu²⁺, Dy³⁺ exhibits white-emission under 365 nm light excitation. • The white afterglow duration of Sr₃Al₂O₅Cl₂: Eu²⁺, Dy³⁺ is about 0.5 h (>0.35 mcd/m²). White long afterglow phosphor with nano-rods, Sr₃Al₂O₅Cl₂: Eu²⁺, Dy³⁺, has been successfully synthesized by the solid state reaction. Their structure, morphology, scanning electron microscopy, luminescent properties and long afterglow properties were investigated by X-ray diffraction, transmission electron microscopy luminescence spectra and the luminescence decay curve. The obtained phosphor Sr₃Al₂O₅Cl₂: Eu²⁺, Dy³⁺ exhibits two broad emission bands, which are located at ∼445 nm and ∼590 nm, respectively. White light can be observed from this phosphor with appropriate CIE values (x = 0.357, y = 0.332). The white afterglow duration of this phosphor is about 0.5 h (>0.35 mcd/m²).