Upconverting luminescent material
The up-conversion luminescent material is a luminescent material that absorbs low-energy light radiation and emits high-energy light radiation. Up-shift luminescence refers to the phenomenon that two or more low-energy photons are converted into one high-energy photon. The luminescence mechanism of up-conversion luminescent materials is due to the coupling effect of two-photon or multi-photon; its characteristic is that the energy of the absorbed photon is lower than the energy of the emitted photon. This phenomenon violates the Stokes law, so this type of The material is also called anti-Stokes luminescent material. In some documents, up-conversion luminescent materials specifically refer to materials that convert infrared light into visible light.