Multiexcitonic two-state lasing in a CdSe nanocrystal laser

Chan, Y.; Caruge, J.-Michel; Snee, P. T.; Bawendi, M. G.
September 2004
Applied Physics Letters;9/27/2004, Vol. 85 Issue 13, p2460
Academic Journal
We report simultaneous amplified spontaneous emission from two different multiexcitonic transitions -1Se-1S3/2 and 1Pe-1P3/2- of colloidal CdSe nanocrystals (NCs) stabilized in high volume fraction in titania matrices. Two-state lasing from both multiexcitonic transitions is achieved in a surface-emitting distributed feedback CdSe NC laser. Variable stripe length measurements show that the gain from the 1Pe-1P3/2 transition is approximately twice that of the -1Se-1S3/2 transition for 4.2 nm radius CdSe/ZnS core-shell NCs.


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