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本文利用荧光光谱方法对不同烧结温度下的SrTiO_3:Eu~(3+)、SrTiO_3:Tb~(3+)和SrTiO_3:Eu~(3+):Tb~(3+)光催化剂能量转移情况及稀土离子所处化学环境进行了研究。发现只有在高达1390℃的烧结温度下,SrTiO_3才向Eu~(3+)有能量传递,而SrTiO_3:Tb~(3+)没有发现类似现象。认为在光催化过程中Eu~(3+)可能是光生电子捕获中心,Tb~(3+)可能是光生空穴捕获中心。实验中还观察到了SrTiO_3:Tb~(3+)中Tb~(3+)向Eu~(3+)有能量转移,并提出了能量转移机制。
In this paper, the energy transfer of SrTiO_3: Eu ~ (3 +), SrTiO_3: Tb ~ (3+) and SrTiO_3: Eu ~ (3 +): Tb ~ (3+) The chemical environment in which rare earth ions are located has been studied. It is found that SrTiO_3 has energy transfer to Eu 3+ only at the sintering temperature up to 1390 ℃, whereas no similar phenomenon is found in SrTiO_3: Tb ~ (3+). It is considered that Eu 3+ may be a photo-induced electron capture center during the photocatalytic process, and Tb 3+ may be a photo-hole-capture center. In the experiment, we also observed the energy transfer from Tb 3+ to Eu 3+ in SrTiO 3: Tb 3+, and proposed the energy transfer mechanism.