نتایج جستجو برای: codoped tio2
تعداد نتایج: 23414 فیلتر نتایج به سال:
This paper investigates the upconversion luminescence modification of codoped nanoparticles with lanthanides ions based thin films through adding a coating. First, these composed Er3+-Yb3+ co-doped anatase-TiO2 are prepared using spin coating technique supported by design experiment (DOE) approach Hadamard matrix order 4 to improve deposition conditions. For step, different thicknesses Al2O3 la...
The doping of TiO2-based nanomaterials for semiconductor-sensitised photoreactions has been a practice extensively studied and applied many years. main goal remains the improvement light harvesting capabilities under passive solar irradiation, that in case undoped TiO2 is limited restricted to relatively low latitudes. activity selectivity doped photocatalysts are generally discussed on basis m...
Yb-Bi codoped magnesium germanate glasses were prepared. Their optical properties were investigated by absorption, luminescence spectra and luminescence decay lifetime and compared with single Bi-doped glass. The emission intensity of Yb-Bi codoped glass (MGBY) is ~10 times larger than that of single Bi-doped sample (MGB). The single-pass optical amplification was measured on a traditional two-...
Ho(3+)/Yb(3+) codoped glass ceramic was prepared by melt-quenching and subsequent thermal treatment. Under a 980 nm diode laser excitation, upconversion emissions from Ho(3+) ions centered at 540, 650, and 750 nm were greatly enhanced compared with those in the precursor glass. Especially, the short-wavelength upconversion emissions centered at 360, 385, 418, 445, and 485 nm were successfully o...
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