物质发光现象大致分为两类:一类是物质受热,产生热辐射而发光,另一类是物体受激发吸收能量而跃迁至激发态(非稳定态)在反回到基态的过程中,以光的形式放出能量。以稀土化合物为基质和以稀土元素为激活剂的发光材料多属于后一类,即稀土荧光粉。稀土元素原子具有丰富的电子能级,因为稀土元素原子的电子构型中存在4f轨道,为多种 The phenomenon of material luminescence can be roughly divided into two categories: one is the material is heated, generating thermal radiation and glow, the other is the object excited by the absorption of energy and transition to the excited state (unstable state) back to the ground state in the process The form of light emits energy. Rare earth compounds as the matrix and rare earth elements as the activator of luminescent materials belong to the latter category, namely, rare earth phosphors. Rare earth elemental atoms have abundant electron energy levels because there are 4f orbitals in the electronic configuration of the rare earth elemental atoms,