Two-step synthesis of SrSi₂O₂N₂: Eu ²⁺ green oxynitride phosphor: Electron-phonon coupling and thermal quenching behavior

SrSi₂O₂N₂: Eu²⁺ green phosphors are prepared using a convenient solid-state reaction with Sr ₂SiO₄: Eu²⁺ as the precursor. The activation energy of crystallization, electron-phonon coupling, and thermal quenching behavior are investigated using differential thermal analysis (DTA) spectra and photoluminescence measurements. SrSi₂O₂N₂: Eu²⁺ green phosphors exhibit excellent thermal stability and color stability due to their weak electron-phonon coupling strength (Huang-Rhys factor 4.2). The thermal quenching temperature (T₅₀) of SrSi ₂O₂N₂: Eu²⁺ is above 200 C. Results show that SrSi₂O₂N₂: Eu²⁺ green phosphors have a broad excitation band and good thermal stability, making them suitable for use in solid-state lighting and GaAsAl solar cells.