Y_2O_3纳米晶中两种格位的Eu^(3+)之间的能量传递

Energy Transfer Between Er^(3+)Ions at Different Crystallographic Sites of Eu^(3+)…Y_2O_3 Nanocrystals

讨论了Eu3 + ∶Y2 O3 纳米晶在低温下的发光性质 ,比较了不同颗粒尺寸的Y2 O3 纳米晶中Eu3 + 离子的发射光谱。根据不同温度下的激发谱 ,分析了处于Y2 O3 纳米晶中C2 和C3i两种格位的激发峰强度随温度的变化。选择激发了不同格位的孤立的Eu3 + 离子和处于相邻格位 (C3i-C2 )的Eu3 + 离子对。结果表明 ,相邻Eu3 + 离子对的能量传递速率比孤立的Eu离子之间的能量传递速率快。分析了纳米Eu3 + …Y2 O3

The luminescent properties of Eu 3+ \:Y 2O 3 nanocrystals at low temperature were studied. Emission spectrum of Eu 3+ ions in Y 2O 3 nanocrystals with different size were compared. Based on excitation spectra at various temperatures, the relationship between the intensities of excitation spectra originating from different sites and the temperature has been analyzed. The luminescence decay curves of 5D 0- 7F 2 Eu 3+ (C 2) emission after excitation into the Eu 3+ (C 3i -C 2) pairs and isolated Eu 3+ ions were measured. The results show that the rate of energy transfer from Eu 3+ (C 3i ) to Eu 3+ (C 2) in the case of Eu 3+ (C 3i )-Eu 3+ (C 2) pairs is faster than that for the isolated Eu 3+ ions. The mechanism of quenching concentration increasing in Eu\:Y 2O 3 nanocrystals has been discussed.