研究目的
Investigating the enhancement of optical coupling efficiency in upconversion luminescent waveguides using rare-earth doped microtubes with beveled ends.
研究成果
A high coupling efficiency for near-infrared light and directional visible fluorescence emission could be achieved by employing the beveled ends. The beveled ends could both enable output efficiency and markedly improve the input efficiency. For the optimized beveled waveguide, a coupling efficiency of B15%/22% was obtained for the red/green channel via the conventional excitation mode. The best coupling efficiency of B68% could be obtained by using beveled ends for both the input and output ends.
研究不足
The coupling efficiency is completely dependent on the angle of the incident light, a special incidence angle is required to achieve total reflection for waveguide excitation. Incident light cannot be coupled into the waveguide when the light falls perpendicular to the waveguide, which limits the applications of luminescent waveguides.
1：Experimental Design and Method Selection:
A RE doped microtube with beveled ends was designed and fabricated to realize a high-performance upconversion luminescent waveguide with near-infrared excitation. The beveled ends enabled both a high input efficiency and a high emission efficiency under vertical excitation of the waveguide.
2：Sample Selection and Data Sources:
NaYF4:Yb3+/Er3+ microtubes with beveled ends were synthesized via a one-pot hydrothermal method assisted with trisodium citrate.
3：List of Experimental Equipment and Materials:
SEM, TEM, EDX, XRD, confocal upconversion fluorescence microscopy system, femtosecond laser, spectrometer.
4：Experimental Procedures and Operational Workflow:
The geometry of the beveled end microtubes was characterized via SEM and TEM. The optical measurements were conducted with a home-made confocal upconversion fluorescence microscopy system.
5：Data Analysis Methods:
The optical simulations were done using the geometric optical method, and the model was built according to the experimental geometry.
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