A revisit of photoluminescence property for vanadate oxides AVO3 (A:K, Rb and Cs) and M3V2O8 (M:Mg and Zn) |
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| Authors: | T. Nakajima M. Isobe Y. Ueda |
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| Affiliation: | a Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan
b Materials Design and Characterization Laboratory, Institute for Solid State Physics, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba 277-8581, Japan |
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| Abstract: | We revisited the vanadium oxide phosphors, AVO3 (A:K, Rb, and Cs) and M3V2O8 (A:Mg and Zn) for a revaluation of possibility of these compounds for lighting applications, and the internal quantum efficiency (η) and luminescent colour properties for AVO3 (A:K, Rb, and Cs) and M3V2O8 (A:Mg, and Zn) have been presented. The AVO3 showed the broadband emission from 380 to 800 nm, and the η for the KVO3, RbVO3 and CsVO3 were 4%, 79% and 87%, respectively. The CIE colour coordinates are located at white region on the chromaticity diagram. The M3V2O8 (A:Mg and Zn) also exhibited a quite broadband emission between 410 and 900 nm, indicating yellow luminescent colour. The Zn3V2O8 showed high η value, 52%, compared to that of the Mg3V2O8 (η=6%). This enhancement of η in the Zn3V2O8 could be due to the increasing exciton diffusion assisted by the hybridizations of Zn 3d and O 2p orbitals for the valence band, and Zn 4s and Ti 3d orbitals for the conduction band. |
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| Keywords: | Phosphor Vanadate White light VO4 Internal quantum efficiency |
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