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³¬¼¶ÀÏ¿ì: ½ð±Ò+100, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2016-11-29 17:53:00
Recently, NIR to visible light upper-conversion with rare earth-doped nanocrystals has been a hot area to pursue, due to its huge application potential in the fields of biofluorescence,  laser devices, solar cells and 3-D solid colored displays, etc. Currently, most effective UCNPs are those excitable under 980 nm laser, made from rare earth particle-doped fluoride fluorescence materials (such as NaYF4:Yb3+:Eu3+, or Yb3+:Tm3+),  all operated based on trivalent rare earth ions capable of  4f-4f transition with relatively narrow bandwidth. These fluoride fluorescence materials have low photon threshold, and their  electron energy level matches well with the excitation wavelength. However, their relatively low efficiency for upper-conversion cannot satisfy practical needs. Bulk hexagonal NaYF4: Yb3+: Er3+ material, a upper-conversion material that is believe to be one of the  most efficient in this kind, for example, merely has 3% efficiency, while in its nanomaterial form, the efficiency is only one tenth of the bulk material. Up to this point, UC fluorescence materials with high efficiency remains to be a big challenge.
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