Upconversion Properties of Ln3+ Doped NaYF4/Polymer Composite Fibers Prepared by Electrospinning

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• 作者：Biao Dong ; Hongwei Song ; Hongquan Yu ; Hui Zhang ; Ruifei Qin ; Xue Bai ; Guohui Pan ; Shaozhe Lu ; Fang Wang ; Libo Fan ; Qilin Dai
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：February 7, 2008
• 年：2008
• 卷：112
• 期：5
• 页码：1435 - 1440
• 全文大小：269K
• 年卷期：v.112,no.5(February 7, 2008)
• ISSN：1932-7455

文摘

Ln³⁺ doped (Yb³⁺,Tm³⁺ codoped and Yb³⁺,Er³⁺,Tm³⁺ tridoped) NaYF₄/poly(vinyl pyrrolidone)(PVP) (M_w 1 300 000) composite fibers with an average diameter of 300-800 nm were prepared by electrospinningand characterized by X-ray diffraction, field emission scanning electron micrography, and Fourier transforminfrared spectra. Their upconversion (UC) luminescence properties were studied in contrast to the correspondingLn³⁺ doped NaYF₄ nanoparticles (15-20 nm) under 980-nm excitation. The results demonstrate that in theYb³⁺,Tm³⁺ codoped composite fibers the blue emission of ¹G₄-³H₆ is dominantly strong, while in thenanoparticles the red emission of ³F_2,3-³H₆ contributes considerably to the increase of the excitation power.This indicates that the color purity of blue is improved greatly by the modification of PVP. In the tridopedYb³⁺,Er³⁺,Tm³⁺ composite fibers, white light with more stable color balance (blue ¹G₄-³H₆ of Tm³⁺, green²H_11/2/⁴S_3/2-⁴I_15/2, and red ⁴F_9/2-⁴I_15/2 of Er³⁺) was obtained. The improved UC properties in the compositefibers are attributed to the suppressed local thermal effect. The energy transfer and UC populating processesare discussed.