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Achieving single‐band upconversion is a challenging but rewarding approach to attain optimal performance in diverse applications, such as multiplexed molecular imaging, security coding, and nonlinear photonic devices. Here, highly efficient single‐band upconversion luminescence in the green spectral regime (16.4 times increase in emission at 525 nm) accomplished by realizing minimal energy loss from...
In article number 1800008, Dong‐Hwan Kim and co‐workers demonstrate highly efficient green single‐band upconversion luminescence under a near‐infrared light source through the largely elevated transition probability of a specific transition pathway in a liquid‐quenched amorphous host material. An ultrafast decay time results, which is 2–3 orders of magnitude faster than previously reported values...
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