Fig. 3

Photophysical properties. a The emission of THF solution (empty triangles) and solid (full triangles) of COTh, concentration: 10 μM, excitation wavelength is 350 nm. Inset: the fluorescence pictures of THF solution (left, dark) and solid (right, green fluorescence) of COTh taken under an excitation wavelength of 365 nm by a portable UV lamp. b The emission of THF solution (empty triangles) and solid (full triangles) of COTh-TMS, concentration: 10 μM, excitation wavelength is 350 nm. Inset: the fluorescence pictures of THF solution (left, dark) and solid (right, green fluorescence) of COTh-TMS taken under an excitation wavelength of 365 nm by a portable UV lamp