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 |