【摘要】 报道了Gd3 + 离子在GdB3 O6基质中的光子级联发射特性。用HitachiM85 0荧光分光光度计测定了Gd3 + 6GJ能态的位置和Gd3 + 离子的光子级联发射光谱 ,Gd3 + 离子的第一个光子发射为6GJ→6PJ(～ 6 0 0nm)和6GJ→6IJ(～ 780nm) ,第二个光子的发射为6PJ→8S7/ 2 (～ 310nm)。由于6D9/ 2 与6I11/ 2 间能级差 (～ 2 90 0cm-1)和6I7/ 2 与6PJ间能级差 (～ 390 0cm-1)较小 ,多声子弛豫的几率明显超过辐射跃迁几率。因此 ,当用8S7/ 2 →6GJ(2 0 2nm)的紫外光激发时 ,只能观察到6PJ→8S7/ 2 (～ 310nm)、6GJ→6PJ(～ 6 0 0nm)和6GJ→6IJ(～ 780nm)的发射跃迁 ,未能观察到6IJ→8S7/ 2 (～ 2 75nm)和6DJ→8S7/ 2 (～ 2 5 0nm)的发射跃迁更多还原

【Abstract】 GdB₃O₆ was synthesized by the solid state reaction at high temperatures. The UV excitation and emission spectra were recorded by a Hitachi M850 fluorescent spectrometer at room temperature. Because the part of （）⁶G_J energy levels of Gd³⁺ are below 50 000 cm^-1, so these ⁶G_J energy levels of Gd³⁺ could be measured by UV excitation. The observation of photon cascade emission of the Gd³⁺ ion in GdB₃O₆ under ⁸S_7/2→⁶G_J ultraviolet excitation （202 nm） was reported. In this host lattice, the lowest energy state of the Gd³⁺ 4f5d excited configuration is located above the ⁶G_J state. The ⁶G_J→⁶P_J and ⁶G_J→⁶I_J transitions are responsible for the first photon emission. The second photon emission originates from the ⁶P_J→⁸S_7/2 transitions. In the GdB₃O₆ host, the energy difference ΔE between the⁶D_9/2 and ⁶I_11/2 (about 2 900 cm^-1), and that between ⁶I_7/2 and ⁶P_J (about 3 900 cm^-1) are smaller, the multiphonon relaxation rate exceeds remarkably the radiative decay rate, so the absence of emission from the ⁶D_J and ⁶I_J states to the ground state ⁸S_7/2 is attributed to the efficient multiphonon ⁶D_J→⁶I_J and ⁶I_J→⁶P_J relaxation.更多还原