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A star-shaped compound 1 with a pyrene core and four triarylamine arms has been prepared and char-acterized.It exhibits intense intramolecular-charge-transfer(ICT)emissions with strong solvatofluorochromism.On the basis of the temperature-de-pendent emission color and wavelength changes,compound 1 behaves as a fluorescent thermometer between 200 and 400 K with a high theromosensi-tivity.In comparison,model compounds with one or two triarylamine arms show distinctly lower thermosensitivity.