Highly efficient, spatially coherent distributed feedback lasers from dense colloidal quantum dot films

C. Dang, J. Lee, K. Roh, H. Kim, S. Ahn, H. Jeon, C. Breen, J. S. Steckel, S. Coe-Sullivan, A. Nurmikko

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Colloidal quantum dots (CQD) are now making their entry to full-color displays, endowed by their brightness and single-material base. By contrast, many obstacles have been encountered in their use towards lasers. We demonstrate here optically pumped distributed feedback (DFB) lasers, based on close-packed, solid films self-assembled from type-I CQDs. Notably, the single mode CQD-DFB lasers could reach such a low threshold as to be pumpable with a compact pulsed source in a quasi-continuous wave regime. Our results show the spatially and temporally coherent laser beam outputs with power of 400 μW and a quantum efficiency of 32%.

Original languageEnglish
Article number171104
JournalApplied Physics Letters
Volume103
Issue number17
DOIs
StatePublished - 21 Oct 2013

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