Experimental study demonstrates efficient green luminescence in a novel europium-doped silicate phosphor, suggesting strong potential for blue-pumped white light emitting diodes.
In this paper, a novel divalent europium-doped green emitting blue convertible K 2 Ba 7 Si 16 O 40:Eu 2+ phosphor has been synthesized successfully via high-temperature solid-state reaction. The structure of K 2 Ba 7 Si 16 O 40:Eu 2+ has been refined on the basis of X-ray powder diffraction by Rietveld refinement method, which consists of two infinite dimensional layers of corner-sharing [SiO 4 ] tetrahedral parallel to (201) linked together through eight-coordinate K and seven- and nine-coordinate Ba atoms. Under excitation of blue light, the K 2 Ba 7 Si 16 O 40:Eu 2+ phosphor emits a strong green emission band peaking at 500 nm. The concentration quenching mechanism of the Eu 2+ ion was discussed and the critical distance was calculated. Furthermore, the phosphor exhibits high quantum efficiency and good thermal stability, indicating that the K 2 Ba 7 Si 16 O 40:Eu 2+ phosphor can serve as an effective green emitting candidate for blue light down-conversion white light emitting diodes.
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Lv et al. (2014) studied this question.
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