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White-light generation through Ce3+/Mn2+-codoped and Eu2+-doped Ba1.2Ca0.8-δSiO4 T-phase phosphors

Ce3+/Mn2+-codoped Ba1.20Ca0.8-2x-ySiO4:xCe3+, xLi+, yMn2+ phosphors show two emission bands peaking at around 600 nm (red) and 400 nm (deep-blue) from the forbidden 4T1-6A1 transition of Mn2+ ions and the allowed 4f-5d transition of Ce3+ ions, respectively. Eu2+-doped Ba1.20Ca0.7SiO4:0.1Eu2+ phosphor shows a broad green emission band from 430 to 550 nm from the allowed f-d transition in Eu2+ ions. The mixtures of both phosphors, excited by the near ultraviolet of 365 nm, show the various qualities of white lights depending on the mixture ratio; the correlated color temperatures from 3500 to 7000 K, and the color-rendering indices up to 95 %. Furthermore, they show a high quenching temperature of about 225 °C.