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(a) Wearable device and -sensing film for continuous transcutaneous monitoring of . The film emission is excited via two (405 nm and 470 nm) high-intensity LED’s and sampled via a 500 nm long-pass filter and a PIN photodiode. (b) Optical spectra of the two different excitation LEDs and the -sensing dye emission, as shown in the inset. The addition of a 500 nm long-pass filter removes the LED emission.
