Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 114, Issue 11, Pages 5160-5167Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp910884c
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The internal luminescence quantum efficiency and color properties of AVO(3) (A: Li, Na, K, Rb, and Cs), M2V2O7 (M: Mg, Ca, Sr, Ba, and Zn), and M3V2O8 (M: Mg, Ca, Sr, Ba, and Zn) have been investigated. These vanadate phosphors exhibited broadband emission from 400 nm to over 800 nm due to the one-electron charge transfer transition in the VO4 tetrahedra, and the color of the lumin escent materials ranged from green to yellow-orange via white, corresponding to 0.277 < x < 0.494 and 0.389 < y < 0.488 on the CIE chromaticity diagram. We found that the luminescence quantum efficiency of the vanadate phosphors with VO4 tetrahedra was strongly enhanced by the strong interaction between V ions and the weak interaction between V and (M) ions in the crystal structures. We hypothesize that the long exciton diffusion lifetime induced by these Structural features enhanced luminescence, leading, to high quantum efficiency.
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