Abstract
Spectral broadening of blue apatite phosphors (Sr, Ba)5(PO4)3Cl:Ce3+ was achieved by changing Sr-Ba cation combinations. Their blue emission colors come from the 5d1-4f1 transition of Ce3+ ions, and their excitation bands are ranged from 250 nm to 400 nm. The substitution of Ba2+ for Sr2+ ions was confirmed by Raman spectra. The broadest Raman width in Sr2.45Ba2.45(PO4)3Cl:Ce3+ phosphor supported its highest disorder of the host lattice, leading to the emission spectral broadening with a half width of 95.5 nm due to the larger variation in crystal filed strength. The thermal quenching behavior showed the blue emission maintenance of 80 % around 100°C. Finally, the 400 nm-pumped white-LED was optically simulated so as to achieve an excellent color-rendering index (Ra) of 90 at white color point.
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