Abstract
Photon recycling is a process occurring in a semiconductor with high internal luminescence quantum yield and overlap in the absorption and emission spectra. Emitted photons, generated by a band-to-band recombination event get reabsorbed in the material, generate an electron-hole pair that subsequently emits a further photon and so on. This leads to changes in the emission spectrum and an enhanced occupation of both photonic and electronic density of states, which can be exploited in optoelectronic devices such as solar cells and light-emitting diodes. In this chapter, photon recycling (PR) in metal halide perovskites is discussed including theory and experimental observations of the phenomenon. Focus is on modeling PR in thin-film systems based on detailed-balance, ray-optics, and full-wave approaches. Based on the simulation results, an outlook is given on potential experimental strategies of photonic design for solar cells and LEDs.
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