Tunable white-light emission of SiAlON-base crystal/glass composite phosphor by variation of excitation wavelength

Tunable white light of Eu 2+ doped SiAlON crystal/glass composite phosphor with blue-yellow dual-emissions was demonstrated by variation of excitation wavelength in this work. The excitation properties of blue emission originated from the transition of Eu 2+ ions in the Si–Al–B–O–N glass matrix and that of yellow emission originated from the transition of Eu 2+ ions in the SiAlON lattice were investigated, respectively. By varying the excitation wavelength in the range of 330–380   nm, white emission was tuned from cool white to warm white for this SiAlON crystal/glass composite phosphor owing to the various excitation properties of these two emission bands. Presented results indicate that this tunable SiAlON crystal/glass composite white-light phosphor might be applied in white LED, combining with UV chips with different emitting wavelengths in the range of 330–380   nm.