Enhancing the upconversion luminescence and photothermal conversion properties of ∼800 nm excitable core/shell nanoparticles by dye molecule sensitization

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• 作者：Qiyue Shao ; ^{qiyueshao@seu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiaosong Li ; Peiyi Hua ; Gongtuo Zhang ; Yan Dong ; Jianqing Jiang
• 关键词：Upconversion nanoparticles ; Dye sensitization ; Photothermal conversion ; Temperature sensing
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：486
• 期：Complete
• 页码：121-127
• 全文大小：2234 K

文摘

Upconversion nanoparticles capable of strongly absorbing photons in a wide spectral range are highly desired for practical applications. In this work, IR-806 dye was used to increase the light absorptivity of Nd³⁺/Yb³⁺/Er³⁺ tri-doped core/shell nanoparticles and then to enhance their upconversion luminescence under ∼800 nm excitation. The IR-806 dye exhibited more efficient energy transfer to Nd³⁺ ions than to Yb³⁺ ions for subsequent upconversion emission due to the increased spectral overlap between the dye emission and Nd³⁺ absorption. The influence of the Nd³⁺ concentration in the shell and the dye/nanoparticle ratio on the dye-sensitization effect was also investigated. A maximum 28-fold overall enhancement in the emission intensity was achieved for NaYF₄:Yb³⁺/Er³⁺@NaYF₄:Yb³⁺/Nd³⁺ core/shell nanoparticles using dye sensitization. The dye-sensitized NaYF₄:Yb³⁺/Er³⁺@NaYF₄:Yb³⁺/Nd³⁺ core/shell nanoparticles also exhibited increased photothermal conversion capabilities and excellent temperature sensing properties, enabling their potential application in photothermal nanoheaters with real-time temperature monitoring under 808 nm single beam excitation.