一种具有应用潜力的等离子体用绿色荧光粉(英文)

研究了绿色荧光粉Ca2GeO4∶Tb3+的真空紫外光谱性质,用172 nm激发荧光粉,其发射峰在549 nm,此绿色发光峰归属于Tb3+的5D4→7F5磁偶极跃迁,Tb3+离子的最佳摩尔分数x=0.05。激发光谱中147 nm和172 nm的激发强度分别是218 nm的1.5和1.7倍。因为在等离子体显示中激发光波长是147 nm和172nm,因此荧光粉在这两个波长的激发强度对荧光粉在等离子体显示中的应用至关重要。Al3+的共掺杂可使荧光粉的发光强度增强2倍,因此,Ca2GeO4∶Tb3+是一种具有应用潜力的等离子体显示用绿色荧光粉。

A Potential Green Phosphor for Application in PDP

Structural characterization of the luminescent material Ca2GeO4:Tb3+ was carried out with X-ray powder diffraction analysis. The VUV luminescence property of the green emitting phosphor Ca2GeO4:Tb3+ was studied in details. When absorption at 172 nm, the phosphor shows bright green emission at 549 nm due to the 5D4 →7F5 magnetic dipole transition, the optimum Tb3+ doping concentration is x=0.05. The absorption intensity at 147 nm and 172 nm is almost 1.5 and 1.7 times of that at 218 nm, respectively. It is worthy to point out that the intense excitation at 147 nm and 172 nm in UVU region makes it undoubtedly convenient to apply in PDP, because the wavelength of excitation source in PDP is mainly at 147 nm and 172 nm. In addition, the Al3+ co-doping enhances the green emission from Ca2GeO4:Tb3+ by about 2 times under VUV excitation. The excellent luminescence properties make it possible as a good candidate for the PDP application.