The laser-induced electron-hole liquid in the diamond: critical lattice temperature and non-equilibrium carrier density

Lipatov, E. I.; Genin, Dmitrii E.; Grigoryev, D V; Тарасенко, В. Ф.

doi:10.1117/12.2225605

Cited by 1 publication

(1 citation statement)

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“…However, research on the temperature dependence of FE and EHL emissions in diamond is not comprehensive enough, with the findings still in controversy. − In addition, because of a limitation of spectral resolution, previous research cannot well distinguish or record the details of how FE and EHL emissions vary with temperature. Therefore, there is a great need for the systematic characterization and study of the temperature dependence of FE and EHL emissions under high-resolution measurements to better understand the band-edge luminescence physics of diamond.…”

Section: Introductionmentioning

confidence: 99%

Anomalous Blue Shift of Exciton Luminescence in Diamond

et al. 2022

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Generally speaking, for a semiconductor, the temperature dependence of excitonic emission corresponds to that of its band gap. However, an anomalous behavior is exhibited by the excitonic luminescence of diamond where as the temperature increases (from 10 to 300 K), its indirect exciton luminescence peak displays a spectral-distinguishable blue shift, whereas the indirect band-gap absorption shows a weak red shift. According to experimental high-resolution deep-ultraviolet spectra and theoretical analysis, the weak red shift of its indirect band gap is ascribed to its large Debye temperature (ΘD ≈ 2220 K), which makes the lattice constant change comparatively little in a large temperature range, so the change of its band gap is relatively small; in this case, as the temperature rises, the thermal population of valence-band holes that moves to a high-energy state far away from the Fermi surface contributes to the macroscopic blue shift of its excitonic emission.

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