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超级老快

木虫之王 (文学泰斗)

[求助] 求汉译英一段话,谢谢大家!

近些年,稀土掺杂的纳米晶的近红外到可见 UCL 成为了重要的科学热点,主要是由于它在生物荧光、激光器、太阳能电池和三维固体彩色显示器等方面有很大的潜在应用。目前,基于三价稀土的 4f-4f 比较窄的谱带跃迁,最有效的UCNPs 是 980 纳米光激发下的稀土粒子掺杂的氟化物荧光材料(比如 NaYF4: Yb3+: Er3+或者Yb3+: Tm3+),这是因为这些氟化物荧光材料具有低的光子阈值,而且它们的能级能有效的与激发光波长相匹配。然而,它们的上转换效率非常低不能满足各种实际应用中的要求。例如,体材料六角相的NaYF4: Yb3+: Er3+被认为最有效的上转换材料,但是它的效率只有 3%。然而纳米材料(<20 纳米)的上转换效率只有体材料的十分之一。直到现在,获得高效率的 UC 荧光材料始终是一个极大的挑战。
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genhunter

至尊木虫 (著名写手)

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超级老快: 金币+100, ★★★★★最佳答案 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.
离成功还差一点
2楼2016-11-29 17:13:19
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