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Yb3+和Er3+离子掺杂的NaYF4纳米晶在近红外光(980nm)激发下可产生中心位于539和655nm的上转换发光,其中位于539nm的发光与四甲基异氰酸罗丹明(tetrametrylrhodarnine isothiocyante,TRITC)染料分子的吸收光谱部分重叠.本文基于上述光谱重叠特性,构筑了以β-NaYF4:Yb,Er为能量给体、TRITC为能量受体的发光共振能量转移(LRET)体系.TRITC分子通过静电作用紧密吸附于纳米晶表面,其较近距离的相互作用利于提高LRET效率和体系的稳定性.在980nm近红外光激发下,LRET过程使NaYF4:Yb,Er位于539nm的上转换发光减弱,同时可观察到TRITC染料分子的发光.对发光寿命的研究也证实了β-NaYF4:Yb,Er到TRITC的能量传递.
The Yb3 + and Er3 + ion-doped NaYF4 nanocrystals can generate upconversion luminescence centered at 539 and 655 nm under excitation of near-infrared light (980 nm), where the emission at 539 nm is related to tetrametrylrhodarnine isothiocyante (TRITC ) Absorption spectra of dye molecules partially overlap.This paper builds a luminescence resonance energy transfer (LRET) system using β-NaYF4: Yb, Er as energy donor and TRITC as energy acceptor based on the above-mentioned spectral overlap characteristics.TRITC molecules are electrostatically The close-packed interaction facilitates the efficiency of LRET and the stability of the system.In the LRET process, the up-conversion luminescence of NaYF4: Yb and Er at 539 nm is weakened while the near-infrared light is excited by 980 nm, meanwhile, The luminescence of TRITC dye molecules was observed.The study of the luminescence lifetime also confirmed the energy transfer of β-NaYF4: Yb, Er to TRITC.