*Luminescent Materials with* Turn-on *and* Ratiometric *Sensory Response Based… DOI: http://dx.doi.org/10.5772/intechopen.109189*

**Table 2.** *Turn-onsensors.*

the implementation of a relatively rare TLC mechanism. Similarly, the appearance of a new intense band in the excitation spectrum makes it possible to implement the EWC mechanism.

vi. A combined analysis of both absorption and excitation spectra of the sensor material, which can be used to prove the ETQC mechanism. For a more accurate determination of the latter, a calculation of the energy of the orbitals is required.
