Low-temperature wet chemical synthesis and photoluminescence properties of YVO4: Bi3+, Eu3+ nanophosphors

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Abstract YVO 4 : Bi 3+ , Eu 3+ nanophosphors are prepared by the citrate-assisted low-temperature wet chemical synthesis. When the colloidal solution is aged at 60 °C, the crystalline YVO 4 : Bi 3+ , Eu 3+ nanorods are formed from the amorphous gel precursors, as confirmed by transmission electron microscopy and X-ray diffractometry (XRD). YVO 4 : Bi 3+ , Eu 3+ nanophosphors emit red through energy transfer from Bi 3+ to Eu 3+ under near-UV-light excitation. The emission intensity increases with increasing the fraction of the crystalline phase during aging. The excitation peak corresponding to Bi 3+ –V 5+ charge transfer relative to those of O 2− –V 5+ and O 2− – Eu 3+ charge transfers gradually becomes strong until the completion of the crystallization, although the contents of individual Bi 3+ and Eu 3+ ions incorporated into YVO 4 keep constant. When the aging is continued after the completion of the crystallization, the content of incorporated Bi 3+ gradually increases, and hence the emission intensity decreases as a result of the energy migration among Bi 3+ ions. These results suggest that in addition to the fraction of the crystalline phase and the contents of incorporated Bi 3+ and Eu 3+ ions, the local chemical states around Bi 3+ play significant roles in photoluminescence properties.

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