Experimental study demonstrates intense white upconversion emission in a single β-NaYF4:Yb/Er microcrystal under saturated excitation, indicating a method to harness silent optical transitions.
Achieving intense nearly white upconversion emission from a single β-NaYF 4 :Yb/Er microcrystal via saturated excitation.
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Yuan et al. (2018) studied this question.
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