Synthesis and photoluminescence characteristics of (Sr, Ca)3B2O6:Eu for application in white light-emitting diodes |
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Authors: | Yanming Xue |
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Institution: | School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, PR China |
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Abstract: | A series of yellow-green (Sr, Ca)3B2O6: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 Sr3−x−yCaxEuyB2O6 with varied Ca2+ and Eu2+ 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 Ca2+ substitution and Eu2+ dopant were also investigated. The composition in the host lattice sensitively affected the chromaticity index. Sr1.21Ca1.7Eu0.09B2O6 (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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Keywords: | Yellow-green phosphors Sol-gel route Solid-solution phases White LEDs |
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