As previously mentioned, red carbon thin films possess a strong fluorescence in the red range of the spectrum (675 nm). Therefore, another very attractive opportunity is the change in the photoluminescence for sensing. As expected, photoluminescence also blue-shifts, more for ethylamine and benzylamine than for other amines. In the first case, after 48 hours of exposure, causes a shift of the photoluminescence from 675 nm of the bare red carbon down to the near UV range (384 nm) (SI). In the second one, benzylamine, fluorescence shifts in the cyan region, with a maximum at 499 nm. The blue-shift is however, less strong for diethylamine, trimethylamine and aniline, analogously to the absorption spectrum, shifting to the orange spectral range (≈595-610 nm). It is worth noticing, that in this way the red carbon thin films and its amino-sensed derivatives enable covering almost the full color spectral range, from the red, through yellow, green, and cyan, down to the deep blue and even near-UV spectrum, blue-shifting more for longer exposure times (to amine vapors) and for primary amines, as exemplarily shown by the CIE 1931 graph (Fig ). Such a wide range of bandgap size and photoluminescence tunability in a simple manner as such gained a lot of attention recently for application in optoelectronics, optical sensors, bioimaging with other materials. Therefore, we assume that the herein presented red carbon thin films can take a share in the above applications, especially for their simple synthetic method as well as their easy tunability over a wide spectral range.