A novel blue-emitting Eu2+-doped chlorine silicate phosphor with a narrow band for illumination and displays: structure and luminescence properties

摘要

A novel silicate-based phosphor Ba5SiO4Cl6: Eu2+ ( BSOC: Eu2+) was successfully designed and investigated through the solid-state method. The crystal structure, band structure, photoluminescence and cathodoluminescence characteristics were investigated in detail. Under excitation at 345 nm, a narrow blue emission band with a peak at 440 nm ( FWHM similar to 32 nm) could be observed. Moreover, BSOC: Eu2+ showed higher color purity when compared with a commercial BAM phosphor. Under sustained low-voltage electron-beam excitation, the BSOC: Eu2+ phosphor exhibited blue emission with distinguished degradation resistance and perfect colour stability. By combining the BSOC: Eu2+ blue phosphor with green and red phosphors and an n-UV chip, a pc-WLED with a high color rendering index and low correlated color temperature was obtained. The results show that the BSOC: Eu2+ phosphor has wide application prospects in n-UV LED applications and FED devices.