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- W2070497548 abstract "Intense blue upconversion emission at 480 nm has been obtained at room temperature in Tm3+–Nd3+ co-doped Ta2O5 channel waveguides fabricated on a Si substrate, when the sample is excited with an infrared laser at 793 nm. The upconversion mechanism is based on the radiative relaxation of the Nd3+ ions (4F3/2 → 4I11/2) at about 1064 nm followed by the absorption of the emitted photons by Tm3+ ions in the 3H4 excited state. A coefficient of energy transfer rate as high as 3 × 10−16 cm3/s has been deduced using a rate equation analysis, which is the highest reported for Tm–Nd co-doped systems. The confinement of the 1064 nm emitted radiation in the waveguide structure is the main reason of the high energy transfer probability between Nd3+ and Tm3+ ions." @default.
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- W2070497548 date "2008-07-01" @default.
- W2070497548 modified "2023-09-25" @default.
- W2070497548 title "Efficient blue upconversion emission due to confined radiative energy transfer in Tm3+–Nd3+ co-doped Ta2O5 waveguides under infrared-laser excitation" @default.
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- W2070497548 doi "https://doi.org/10.1016/j.optcom.2008.03.046" @default.
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