Elsevier

Solid State Communications

Volume 99, Issue 11, September 1996, Pages 793-797
Solid State Communications

Photoluminescence and decay kinetics of indirect free excitons in diamonds under the near-resonant laser excitation

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Abstract

Indirect edge emission spectra were observed in types-IIa, -Ib and -Ia diamond crystals, excited with a pulsed laser just above the indirect band gap. In the type-IIa the lifetime of indirect free excitons was also measured, whose temperature dependence was successfully analyzed using a rate-equation model including a bound exciton formation. Weak luminescence observed in other diamonds was qualitatively explained by a strong nonradiative process related to deep impurities.

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