Synthesis, Structure and Luminescence Properties of Novel Red-Emitting Na2SrSi2O6:Eu3+ Phosphors.

Abstract

The novel red phosphors Na₂SrSi₂O₆:xEu³⁺(x = 0.1 ~ 0.5) were successfully prepared using the high-temperature solid-state synthesis method. The phase morphology, luminescence properties, fluorescence quenching, thermal stability, fluorescence lifetime, quantum efficiency, and CIE chromaticity coordinates of the phosphors were characterized. Experimental results show that the Na₂SrSi₂O₆:Eu³⁺ phosphors are capable of emitting intense red light when illuminated by 393 nm excitation wavelength. By studying the fluorescence emission spectra at different doping concentrations, a doping concentration of x = 0.3 was determined. The concentration quenching mechanism of Na₂SrSi₂O₆:Eu³⁺ phosphor was identified as electric dipole-electric dipole (d-d) interactions. At temperatures of 313 K, 373 K, and 433 K, the emission intensity was maintained at 99.2%, 94.6%, and 90.8% of the room temperature value, respectively. Furthermore, the samples displayed high quantum efficiency, extended fluorescence lifetime, superior color purity, and low correlated color temperature. Consequently, the Na₂SrSi₂O₆:Eu³⁺ red phosphor shows significant potential for applications in the realm of white light LEDs.