The , phosphors show three emission bands peaking at around (blue), (yellow), and (red). The blue band originates from the allowed transition of ions on Ca sites. The yellow and red bands originate from the forbidden transition of ions on and sites, respectively. Electron paramagnetic resonance measurement demonstrates that ions occupy two different and sites. The mixtures of the green-poor , and the green-to-yellow emissive , excited by the near ultraviolet of , show the various chromaticity of white light depending on the mixture ratio; the correlated color temperatures from , and the color rendering indices from 71% to 88%.
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.© 2006 American Institute of Physics.
2006
American Institute of Physics
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