Abstract
Novel red-emitting phosphors Sr7Sb2O12: Sm3+ and Sr7Sb2O12: Sm3+, Eu3+ were successfully synthesized through a high temperature solid-state reaction method. The materials were characterized by X-ray diffraction patterns, scanning electron microscopy, Raman spectra, diffuse reflection spectra, photoluminescence excitation and emission spectra, luminescence decay curves and temperature-dependent emission spectra. The energy transfer between Sm3+ and Eu3+ ions in Sr7Sb2O12 was realized via electric quadrupole–quadrupole interaction with about 42.4% transfer efficiency. The phosphor exhibited good thermal stability with activation energy of 0.180 eV. Color coordinates and color purity of Sr7Sb2O12: 0.08Sm3+, 0.09Eu3+ was (0.620, 0.368) and 87.4% respectively. Combined the red phosphor with the near-UV or blue chips, the fabricated light emitting diode (LED) lamp emitted white light with Ra = 83.7 or 82.4 color rendering index (CRI) respectively. These results demonstrated that Sm3+/Eu3+ co-doped Sr7Sb2O12 red phosphor has a great potential application in white LED.
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