ABSTRACT
The quantum cutting (QC) process helps to obtain two or more photons for each absorbed photon. The phosphor materials doped with rare-earth combinations show a quantum-cutting effect when excited with a suitable wavelength. Quantum cutting materials are also known for their higher quantum efficiency, which is higher than unity. Luminescent materials showing a quantum-cutting phenomenon or higher conversion efficiency show significant applications in the lighting industry and display electronics. As per the principle of QC, any phosphor that generates two or more lower energy photons upon absorption of every high energy photon led to higher quantum efficiency. Phosphor thermometry deals with surface temperature measurement via an optical method. This method includes infrared thermal imaging i.e., detection of infrared radiation in the far infrared region of the spectrum. This chapter will focus on various quantum-cutting phosphors, which have potential applications in thermal sensing.
