Yb³⁺/Er³⁺ codoped ¦Â-NaYF₄ microrods: Synthesis and tuning of multicolor upconversion

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• 作者：Dangli Gao^a ; ^{gaodangli@163.com} ; Xiangyu Zhang^b ; Hairong Zheng^c ; Wei Gao^c ; Enjie He^c
• 关键词：Multicolor ; Upconversion ; Microcrystals ; Synthesis ; Tuning
• 刊名：Journal of Alloys and Compounds
• 出版年：2013
• 出版时间：25 March, 2013
• 年：2013
• 卷：554
• 期：Complete
• 页码：395-399
• 全文大小：994 K

文摘

A series of ¦Â-NaYF₄ microrods doped with Yb³⁺/Er³⁺ have been successfully synthesized through a facile hydrothermal method. The fluoride microcrystals have been characterized by XRD, SEM, and the photoluminescence spectra method. The upconversion spectra show that the output light color have been tuned from green to red under near infrared excitation at 977 nm when replacing Y³⁺ ions with a different amount of Yb³⁺ in NaYF₄:Yb/Er microcrystals. The effect of the intrinsic structural feature of fluoride compounds and four external factors, namely the concentration of Yb³⁺, the concentration of Er³⁺, the particle size and the use of an organic additive (EDTA), on the ultimate output light color of samples are investigated detailedly. The results show that the output light color is more sensitive to the concentration of Yb³⁺ than that of Er³⁺. When elevated the concentration of dopants (Er³⁺ or Yb³⁺) in the NaYF₄ host lattice, the cross-relaxation process derived from Er³⁺ promoted the red emission and quenched the green emission.