ITO nanoparticles enhanced upconversion luminescence in Er/Yb-codoped silica glasses.

Upconversion (UC) materials have shown many applications in the solar cell industry, biomedical imaging, and LED lighting. For the first time, we report enhanced UC in Er/Yb-codoped silica glasses induced by the energy transfer between rare earth ions and indium tin oxide nanoparticles (ITO NPs), introduced by an in situ growth approach. The enhancements of the intensities of the emissions of red and green light were all more than 10 fold and in some cases up to 42 fold.

Yb heavily doped photonic crystal fiber lasers prepared by the glass phase-separation technology.

We report a Yb heavily doped photonic crystal fiber with 30 μm core diameter manufactured for the first time by an alternative technique. Silica core rods with a diameter of 3 mm and a length of 280 mm were prepared by the sodium-borosilicate glass phase-separation technology. The measurements show that the fiber has an Yb concentration of 22810 ppm by weight, and a resultant absorption of approximately 8.