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

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

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Quantum Dots
Semiconductors
Genetic Recombination
Technology
Equipment and Supplies
LDS 751

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Sub–single-exciton lasing using charged quantum dots coupled to a distributed feedback cavity. / Kozlov, Oleg V.; Park, Young Shin; Roh, Jeongkyun; Fedin, Igor; Nakotte, Tom; Klimov, Victor I.

In: Science, Vol. 365, No. 6454, 01.01.2019, p. 672-675.

Research output: Contribution to journalArticle

Kozlov, Oleg V. ; Park, Young Shin ; Roh, Jeongkyun ; Fedin, Igor ; Nakotte, Tom ; Klimov, Victor I. / Sub–single-exciton lasing using charged quantum dots coupled to a distributed feedback cavity. In: Science. 2019 ; Vol. 365, No. 6454. pp. 672-675.
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