La(BO3,PO4):Ce,Tb,Gd的发光研究 | 您所在的位置:网站首页 › 复旦大学丁士进潜山哪里人 › La(BO3,PO4):Ce,Tb,Gd的发光研究 |
以BPO4和稀土氧化物为原料制备了铈、铽、钆共掺杂的硼磷酸镧绿色荧光粉,研究了基质中Gd3+、Ce3+、Tb3+的发光特性及它们之间的相互作用。在该基质中存在Ce3+→Gd3+、Gd3+→Tb3+、Ce3+→Tb3+的能量传递;当钆加入到铈、铽共掺杂的硼磷酸镧基质中会导致铈离子的发射减弱,铽离子5D4→7FJ的发射显著增强,而5D3→7FJ的发射没有明显变化,故有利于提高荧光粉的发光强度和绿色发射纯度。用硼磷酸钆作基质比用硼磷酸镧更能提高荧光粉的发光强度、发光纯度以及发光色坐标x的值,所以La(BO3,PO4):Ce,Tb,Gd和Gd(BO3,PO4):Ce,Tb均是理想的绿色发射材料。 Green- emitting phosphors of lanthanum borophosphate doped with Ce3+,Tb3+and Gd3+ have been prepared using BPO4 and rare earth oxides. The spectroscopic properties of Ce3+ ,Tb3+and Gd3+and interaction among them in lanthanum borophosphate have been studied. There exist three kinds of energy transfer of Ce3+→ Gd3+, Gd3+→Tb3+and Ce3+→ Tb3+. The addition of Gd3+ to lanthanum borophosphate doped with Ce3+, Tb3+ leads to a decrease in Ce3+ emission intensity, a sharp increase in 5D4→ 7FJ emission intensity of Tb3+ and no obvious change in 5D3→ 7FJ emission intensity, which is in favor of enhancing intensity and purity of green emission. Compared with lanthanum borophos- phate, gadolinium borophosphate used as the matrix material enhances intensity and purity of lumines- cence, as well as the x value of chromatic coordinates. So the phosphors of La(BO3,PO4):Ce,Tb,Gd and Gd(BO3,PO4):Ce,Tb are the desired materials with green emission. |
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