Abstract
A series of yellow–green (Sr, Ca) 3B 2O 6:Eu phosphors have been synthesized using precursors prepared via a facile sol–gel route. The solid-solution phases crystallized to materials with the formula of Sr 3− x− y Ca x Eu y B 2O 6 with varied Ca 2+ and Eu 2+ contents. The emission peak centered at 540 nm under near-UV excitation exhibited a broad-band distribution in the range of 450–650 nm. The dependences of the luminescence intensity on the contents of Ca 2+ substitution and Eu 2+ dopant were also investigated. The composition in the host lattice sensitively affected the chromaticity index. Sr 1.21Ca 1.7Eu 0.09B 2O 6 (SCB:0.09Eu) was shown to possess the highest intensity and broadest emission band. Calcining temperature was shown to greatly influence the luminescent properties of SCB:0.09Eu. It is concluded that SCB:0.09Eu can be used as an efficient yellow–green phosphor for white light-emitting diodes (white LEDs) applications.
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