Size dependence of Eu2+ fluorescence in ZnS:Eu2+ nanoparticles
Size dependence of Eu2+ fluorescence in ZnS:Eu2+ nanoparticles
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DOI：
10.1063/1.1344582
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发表时间：
2001-03-01
影响因子：
3.2
通讯作者：
Bovin, JO
中科院分区：
文献类型：
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作者：
Chen, W;Malm, JO;Bovin, JO
4.2、3.2和2.6 nm尺寸的ZnS：Eu 2+纳米颗粒的发射带分别在670、580和520 nm处达到峰值。4.2nm尺寸的纳米颗粒的发射源自Eu 2+结合激子的复合，而3.2和2.6nm尺寸的纳米颗粒的发射来自4f（6）5d（1）（t（2g））-4f（7）的Eu 2+离子内跃迁。研究了ZnS：Eu ~（2+）纳米粒子中Eu ~（2+）的4f（6）5d（1）（t（2g））-4f（7）跃迁随尺寸变化的可能机制，认为尺寸减小导致的电子-声子耦合和晶场强度的降低是引起跃迁的两个主要因素。(C)2001年美国物理学会。
The emission bands of the 4.2, 3.2 and 2.6 nm sized ZnS:Eu2+ nanoparticles are peaking at 670, 580 and 520 nm, respectively. The emission of the 4.2 nm sized nanoparticles originates from the recombination of the Eu2+-bound exciton, while the emission of the 3.2 and 2.6 nm sized nanoparticles is from the Eu2+ intra-ion transition of 4f(6)5d(1)(t(2g))-4f(7). Possible mechanisms for the size dependence of the 4f(6)5d(1)(t(2g))-4f(7) transition of Eu2+ in ZnS:Eu2+ nanoparticles were investigated, and it was concluded that the decreases in the electron-phonon coupling and in crystal field strength upon a decrease in size are the two major factors responsible for the shift. (C) 2001 American Institute of Physics.