| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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A novel yellow emitting phosphor Dy3+, Bi3+ co-doped YVO4 potentially for white light emitting diodes |
| Ci Zhi-Peng(慈志鹏)a), Wang Yu-Hua(王育华) a)b)†, and Zhang Jia-Chi(张加弛)a) |
| a Department of Material Science, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China; bKey Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China |
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Abstract Novel Y$_{1 - x - y}$VO$_{4}$:$x$Dy$^{3 + }$, $y$Bi$^{3 + }$ ($0.01 \le x \le 0.05, 0 \le y \le 0.20$) phosphors for light emitting diode (LED) were successfully synthesised by solid-state reaction. The calculation results of electronic structure show that YVO$_{4}$ has a direct band gap with 3 eV at $G$. The top of the valence band is dominated by O 2p state and the bottom of the conduction band is mainly composed of O 2p and V 3d states. An efficient yellow emission under near-ultraviolet (365 nm) excitation is observed. Compared with the pure YVO$_{4}$:Dy$^{3 + }$ samples, the Dy$^{3 + }$, Bi$^{3 + }$ co-doped samples show a more intensive emission peak (at 574 nm) and a new broad emission band (450--770 nm), due to the $^{4}F_{9 / 2}-{}^{6}H_{13 / 2 }$ transition of Dy$^{3 + }$ and the emission of the VO$_{4}^{3 - }-$Bi$^{3 + }$ complex respectively. The optimum chromaticity index of Y$_{1 - x - y}$VO$_{4}$:$x$Dy$^{3 + }$, $y$Bi$^{3 + }$ ($0.01 \le x \le 0.05, 0 \le y \le 0.20$) is (0.447, 0.497), which indicates that YVO$_{4}$:Dy$^{3 + }$, Bi$^{3 + }$ has higher colour saturation than the commercial phosphor YAG: Ce$^{3 + }$. The effects of concentration of Dy$^{3 + }$, Bi$^{3 + }$, electric states and the photoluminescence properties are discussed in details.
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Received: 05 May 2009
Revised: 20 November 2009
Accepted manuscript online:
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PACS:
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85.60.Jb
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(Light-emitting devices)
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71.20.Ps
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(Other inorganic compounds)
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78.55.Hx
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(Other solid inorganic materials)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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| Fund: Project supported by the National
Natural Science Foundation of China (Grant No.~10874061). |
Cite this article:
Ci Zhi-Peng(慈志鹏), Wang Yu-Hua(王育华), and Zhang Jia-Chi(张加弛) A novel yellow emitting phosphor Dy3+, Bi3+ co-doped YVO4 potentially for white light emitting diodes 2010 Chin. Phys. B 19 057803
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