Abstract
Abstract Hexagonal Ba 1.20 Ca 0.8−2 x − y SiO 4 :xCe 3+ , x Li + , y Mn 2+ phosphors exhibit two emission bands peaking near 400 and 600 nm from the allowed f–d transition of Ce 3+ ions and the forbidden 4 T 1 – 6 A 1 transition of Mn 2+ ions, respectively. The strong interaction between Ce 3+ /Mn 2+ ions is investigated in terms of energy transfer, crystal field effect, and microstructure by varying their concentrations. They show a higher quenching temperature of 250 °C than that of a commercially used (Ba,Sr) 2 SiO 4 :Eu 2+ phosphor (150 °C). Finally, mixtures of these phosphors with green-emissive Ba 1.20 Ca 0.70 SiO 4 :0.10Eu 2+ are tested and yielded correlated color temperatures from 3500 to 7000 K, and color rendering indices up to 95%.
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