Blue semiconductor nanocrystal laser

Yinthai Chan; Steckel, Jonathan S.; Snee, Preston T.; Caruge, J.-Michel; Hodgkiss, Justin M.; Nocera, Daniel G.; Bawendi, Moungi G.
February 2005
Applied Physics Letters;2/14/2005, Vol. 86 Issue 7, p073102
Academic Journal
We demonstrate tunable room-temperature amplified spontaneous emission and lasing from blue-emitting core-shell CdS/ZnS nanocrystals (NCs) stabilized in a sol-gel derived silica matrix. Variable stripe length measurements show that these NC-silica composites have a modal gain of ∼100 cm-1 at room temperature. Coating microspheres with a NC-silica composite film via a facile process resulted in uniform resonators that exhibit room-temperature lasing over long periods of continuous excitation. This work opens up a spectral window for emission tunable, microscale NC-based lasers.


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