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Comparison between the excitation and emission spectra of QD655 and Alexa Fluor 660. The emission maxima of QD655 and Alexa Fluor 660 occur at 653 and 690 nm, respectively. The excitation spectra were measured by the lab-grade spectrophotometer with quartz cuvettes; the emission spectra were collected by the homemade UV LED/ITO/CCD spectrometer optical sensor.
