Observation of Second-Generation Nonequilibrium Phonons in Highly Photoexcited CdS Microcrystals
G. Kurilc̆ik, M. Strumskis, S. Jurs̆ėnas and A. Z̆ukauskas
Institute of Materials Science and Applied Research, Vilnius University Naugarduko 24, Vilnius 2006, Lithuania
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Luminescence kinetics of nonthermalized electron-hole plasma in highly excited CdS microcrystals embedded in glass was studied at T=295 K using two pump pulses technique. The observed carrier kinetics shows additional increase in the effective temperature during the pump pulse as a result of the prepump pulse. The increase is shown to be produced by a fusion of long-lived second-generation nonequilibrium phonons generated by the prepump pulse. The experimental results are in good agreement with a model of hot electron-hole plasma energy relaxation with a build-up of two generations of nonequilibrium phonons.
DOI: 10.12693/APhysPolA.90.875
PACS numbers: 63.20.Kr, 78.47.+p, 78.55.Et