Sr-Ba Combinational Effect On Spectral Broadening Of Blue (Sr, Ba)(5)(Po4)(3)Cl:Ce3+ Phosphor For A High Color-Rendering Index

Spectral broadening of blue apatite phosphors (Sr, Ba)(5)(PO4)(3)Cl:Ce3+ was achieved by changing Sr-Ba combinations. The blue colors came from 5d(1) to 4f(1) transitions of Ce3+ ions, and the excitation bands were ranged from 250nm to 400nm. The broad Raman spectrum in Sr2.45Ba2.45 (PO4)(3)Cl:Ce3+ supported its highest disorder, leading to the spectral broadening with a half width of 95.5nm. The temperature dependence showed the emission maintenance of 80% around 100 degrees C. The 310 nm-pumped white LED was simulated so as to show a color rendering index (R-a) of 74 at white point. (C) 2015 Elsevier B.V. All rights reserved.