Two-Step Synthesis of SrSi2O2N2: Eu2+ Green Oxynitride Phosphor: Electron-Phonon Coupling and Thermal Quenching Behavior

Abstract

SrSi2O2N2: Eu2+ green phosphors are prepared using a convenient solid-state reaction with Sr2SiO4: 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 SrSi2O2N2: 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.