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a) Schematic chemical structures of Q5, Q6, Q7 and Q8. b) UV-vis-NIR absorbance and NIR-II fluorescence emission of Q5-Q8 in dichloromethane. c) NIR-II signals of Q5-Q8 in dichloromethane with various long-pass filters (1000-1250 nm) under an 808 nm excitation laser (180 mW cm−2, exposure time: 20 ms).
