Sub–single-exciton lasing using charged quantum dots coupled to a distributed feedback cavity

Oleg V. Kozlov, Young Shin Park, Jeongkyun Roh, Igor Fedin, Tom Nakotte, Victor I Klimov

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Colloidal semiconductor quantum dots (QDs) are attractive materials for realizing highly flexible, solution-processable optical gain media, but they are difficult to use in lasing because of complications associated with extremely short optical-gain lifetimes limited by nonradiative Auger recombination. By combining compositional grading of the QD’s interior for hindering Auger decay with postsynthetic charging for suppressing parasitic ground-state absorption, we can reduce the lasing threshold to values below the single-exciton-per-dot limit. As a favorable departure from traditional multi-exciton–based lasing schemes, our approach should facilitate the development of solution-processable lasing devices and thereby help to extend the reach of lasing technologies into areas not accessible with traditional, epitaxially grown semiconductor materials.

Original languageEnglish
Pages (from-to)672-675
Number of pages4
JournalScience
Volume365
Issue number6454
DOIs
Publication statusPublished - Jan 1 2019

ASJC Scopus subject areas

  • General

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