Abstract
Nanocrystals of Ln3+ (Ln = Yb, Tm and Ho) doped β-NaLuF4 with average diameter about 200 nm are dispersed in silica-based microtube (MT) by a simple flame heating method. The fabricated microtube has a diameter range from 2 μm to 30 μm and lengths up to hundreds microns. The fluorescence of upconversion nanocrystals (UCNCs) can propagate along a single MT and couple into another MT through evanescent field. The guiding performance of the single UCNCs doped MT is measured to prove that it can be used as an active waveguide. Moreover, optical temperature sensing based on the single UCNCs-MT is also demonstrated, and the sensitivity of UCNCs-MT is significantly enough for thermometry applications in the range of 298–383 K.
Highlights
Lanthanide doped upconversion nanocrystals (UCNCs) have been investigated extensively due to their tremendous potential applications such fields as multimodal bioimaging[1,2,3], electro-optical modulator[4,5], magnetic sensors[6,7], and optical temperature sensing[8,9,10]
We have demonstrated a simple method to dope the UCNCs in the MT by flame-heated drawing from the silica capillary tubing
The single MT was proved to be an active waveguide by guiding performance measurement
Summary
Lanthanide doped upconversion nanocrystals (UCNCs) have been investigated extensively due to their tremendous potential applications such fields as multimodal bioimaging[1,2,3], electro-optical modulator[4,5], magnetic sensors[6,7], and optical temperature sensing[8,9,10]. One-dimensional fluorescence micro-wave guide, such as dye-doped polymer nanowire and QDs doped nanofiber, have been studied and applied to a series of integrated microstructure optical devices, including nano lasers, micro-optical sensors, fiber biosensors[19,20,21,22,23]. The fluorescence photons can be coupled into guided modes of microfibers or nanofibers due to the high efficiency evanescence[24]. We demonstrated optical thermometry based on the single MT due to the unique electron configuration of lanthanide active ions
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