Emission characteristics of SPAN-80 activated ZnS nanocolloids

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• 作者：Thu Huong Ngo^a ; Hong Van Bui^a ; Van Ben Pham^a ; Thi Hong Tran^a ; An Bang Ngac^a ; Nam Nhat Hoang^b ; ^{namnhat@gmail.com}
• 关键词：Photoluminescence ; ZnS ; TD-DFT ; Nanocolloid
• 刊名：Journal of Luminescence
• 出版年：2012
• 期刊代码：54_00222313
• 类别：ch
• 出版时间：August, 2012
• 卷：132
• 期：8
• 页码：2135-2142
• 文件大小：959 K

摘要

Quantum surface effects (new emission bands, blueshifts, intensity enhancement) were observed in SPAN-80 activated ZnS nanocolloids and explained in terms of time-dependent density functional theory. The experimental evidences were demonstrated for both undoped and Cu, Mn-doped colloidal phases. The photoluminescence spectra of these materials showed a new green band at 520 nm (ZnS:Cu) and a yellow-orange band at 576 nm (ZnS:Mn) besides a blue band at 465 nm. All bands lie in the visible region and are blueshifted, show sharp emissions with narrow widths and have approximately 20-times stronger intensities in comparison with those of the bulk samples. The time-resolved luminescence spectra showed that the life-times of free electrons were 0.12 渭s and 1.9 ms in ZnS:Cu and ZnS:Mn correspondingly.