摘要
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.
出处
《功能材料与器件学报》
CAS
CSCD
2001年第1期21-26,共6页
Journal of Functional Materials and Devices
