Luminescence properties of a novel red-emitting phosphor LaBMO6: Pr3+ (M = W, Mo)

Abstract A novel blue InGaN-chip-based red-emitting phosphor Pr 3+ : LaBMO 6 (M = W, Mo) in pure phase were synthesized via conventional solid-state reaction in air and the photoluminescence properties of the phosphor were investigated for the application in white LEDs. The as-synthesized phosphors were characterized by the X-ray diffraction; diffuse reflection spectra, photoluminescence excitation and emission spectra, the Commission International de L'Eclairage (CIE) chromaticity coordinates and temperature-dependent emission spectra. Orangish red emission band around 575–625 nm was observed in Pr 3+ -doped LaBMO 6 (M = W, Mo) upon 445 nm excitation. Fluorescence concentration quenching in Pr 3+ -doped LaBMoO 6 were observed and the critical distance between Pr 3+ ions for energy transfer was calculated to be 8.369 nm. The CIE chromaticity coordinates of Pr 3+ -doped LaBMoO 6 were located in the red spectral region and the temperature-dependent luminescence spectra indicated that Pr 3+ -doped LaBMoO 6 show good thermal stability. All results demonstrated the developed Pr 3+ -doped LaBMO 6 (M = W, Mo) was a novel red phosphor.