【摘要】 研究了碱金属及碱土金属离子掺杂的荧光体Y2 O3∶Eu3+ 0 .0 5,A+ 0 .0 2 (A =Li、Na、K)和Y2 O3∶Eu3+ 0 .0 5,B2 + 0 .0 2 (B =Mg、Ca、Sr、Ba)的荧光、余辉发光及热释光特性。余辉光谱数据表明 :杂质离子掺杂的荧光体Y2 O3∶Eu3+ 的余辉发射主峰与未掺杂荧光体Y2 O3∶Eu3+ 的荧光发射主峰 (611nm)一致 ,为经典Eu3+ 的5D0 7F2 电偶极跃迁 ;杂质离子的引入明显地延缓了Y2 O3∶Eu3+ 的余辉衰减 ,其中Y2 O3∶Eu3+ ,A+ (A =Li、Na、K)的余辉衰减趋势几乎完全一致 ,而Y2 O3∶Eu3+ 、B2 + (B =Mg、Ca、Sr、Ba)的余辉衰减趋势由慢到快依次为Ca、Sr、Ba、Mg。热释光谱数据显示 ,杂质离子的掺杂导致基质中电子陷阱能级的生成 ,这是导致余辉衰减减慢的直接原因。Y2 O3∶Eu3+ ,A+ 的热释峰都位于 175℃左右 ,相应电子陷阱能级深度为 0 .966eV左右 ;而Y2 O3∶Eu3+ ,B2 + 的热释峰由高到低分别位于 192℃ (Ca)、164℃ (Sr)、13 5℃ (Ba)、118℃(Mg) ,电子陷阱能级深度分别为 1.0 0 3eV(Ca)、0 .942eV(Sr)、0 .880eV(Ba)、0 .843eV(Mg)。结合余辉衰减数据 ,可以看到 ,Y2 O3∶Eu3+ ,A+ 和Y2 O3∶Eu3+ ,B2 + 的热释光谱与相应荧光体的余辉衰减趋势吻合得十分好 ,由此可以得出 ,一定相同的条件下 ,热释峰值温度越高 ,杂更多还原

【Abstract】 The afterglow luminescent property and thermoluminescence (TL) of Y 2O 3∶Eu 3+ 0.05 , A + 0.02 (A=Li, Na, K) and Y 2O 3∶ Eu 3+ 0.05 , B 2+ 0.02 (B=Mg, Ca, Sr, Ba) have been systematically investigated. The afterglow emission of impurity ions doped Y 2O 3∶Eu 3+ shows that the predominant emission peaking at 611nm was the typical 5D 0 7F 2 transition of Eu 3+ , which was the same with that of undoped Y 2O 3∶Eu 3+ . It was obviously observed that impurity ions slower the decay of Eu 3+ in Y 2O 3. And the decay behaviors of alkali metal ions doped Y 2O 3∶Eu 3+ were almost identical, while those of alkali earth metal ions doped Y 2O 3∶Eu 3+ follow the sequence from slow to fast decay: Ca, Sr, Ba, Mg. The TL spectra data showed that there were electron traps in Y 2O 3∶Eu 3+ due to doping of impurity ions, which determine the afterglow decay behavior. As the alkali metal ions doped Y 2O 3∶Eu 3+ were concerned, TL peak temperature were all around 175℃, and the trap depth were all around 0.966eV. But for the alkali earth metal ions doped Y 2O 3∶Eu 3+ , the decrease of TL peak temperatures follow the sequeace 191.5℃(Ca), 164.3℃(Sr), 134.5 ℃(Ba), 117.9℃(Mg), and that of trap depth do the sequeace 1.003eV(Ca), 0.942eV(Sr), 0.880eV(Ba), 0.843eV(Mg). By correlating the TL spectra data to the afterglow behaviors of impurity ions doped Y 2O 3∶Eu 3+ , it can be found that the TL spectra were completely consistent with the corresponding afterglow decay. Under the certain condition, the higher TL peak temperature and the deeper trap depth were, the slower the afterglow behavior was.更多还原