Upconversion Luminescence Nanoprobes: Strategies for Constructing Upconversion Luminescence Nanoprobes to Improve Signal Contrast (Small 1/2020)

Ever since the first report of UC-FRET in 2005, which introduced upconversion (UC) fluorescence into biosensing, imaging and medical applications, it has been growing more and more quickly during the past 15 years. In article number 1905084, Zhihong Liu and co-workers review the efforts to improve the signal contrast of UC probes and sensors, which have gone beyond the FRET principle.