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Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors

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Efficient emission-tunable VUV phosphors Na(2)GdF(2)PO(4):Tb(3+).

Zifeng Tian¹, Hongbin Liang, Wanping Chen

¹MOE Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China.

|January 23, 2009

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Area of Science:

Materials Science
Solid-State Chemistry
Luminescence

Background:

Rare-earth doped phosphors are crucial for lighting and display technologies.
Developing efficient and tunable phosphors is an ongoing research area.

Purpose of the Study:

To investigate the vacuum ultraviolet-visible (VUV-vis) spectroscopic properties of Na(2)GdF(2)PO(4):Tb(3+) phosphors.
To evaluate their potential for applications in display panels and lighting.

Main Methods:

Synthesis of Na(2)Gd(1-x)Tb(x)F(2)PO(4) phosphors at 700 °C.
Characterization using VUV-vis spectroscopy.
Analysis of luminescence properties and chromaticity coordinates.

Main Results:

The synthesized phosphors exhibit intense and broad absorption bands near 147/172 nm.
High luminescence brightness was observed across all doping concentrations.
Tunable chromaticity coordinates were achieved, ranging from blue to yellowish-green, by adjusting Tb(3+) doping levels.

Conclusions:

The Na(2)Gd(1-x)Tb(x)F(2)PO(4) phosphors demonstrate excellent luminescence characteristics.
These phosphors are promising candidates for plasma display panels (PDPs) and mercury-free fluorescent tubes.