Optical gain in colloidal quantum dots achieved with direct-current electrical pumping

Lim, Jaehoon; Park, Young-Shin; Klimov, Victor Ivanovich

doi:10.1038/nmat5011

Title: Optical gain in colloidal quantum dots achieved with direct-current electrical pumping

Journal Article · Mon Nov 20 00:00:00 EST 2017 · Nature Materials

DOI:https://doi.org/10.1038/nmat5011· OSTI ID:1412893

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of New Mexico, Albuquerque, NM (United States). Centre for High Technology Materials; Ajou University, Suwon (Korea)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of New Mexico, Albuquerque, NM (United States). Centre for High Technology Materials
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Chemically synthesized semiconductor quantum dots (QDs) can potentially enable solution-processable laser diodes with a wide range of operational wavelengths, yet demonstrations of lasing from the QDs are still at the laboratory stage. An important challenge—realization of lasing with electrical injection—remains unresolved, largely due to fast nonradiative Auger recombination of multicarrier states that represent gain-active species in the QDs. Here in this paper, we present population inversion and optical gain in colloidal nanocrystals realized with direct-current electrical pumping. Using continuously graded QDs, we achieve a considerable suppression of Auger decay such that it can be outpaced by electrical injection. Further, we apply a special current-focusing device architecture, which allows us to produce high current densities (j) up to ~18 A cm^-2 without damaging either the QDs or the injection layers. The quantitative analysis of electroluminescence and current-modulated transmission spectra indicates that with j = 3-4 A cm^-2 we achieve the population inversion of the band-edge states.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396; 89233218CNA000001

OSTI ID:: 1412893

Report Number(s):: LA-UR-17-20393; LA-UR-19-29402; TRN: US1800399

Journal Information:: Nature Materials, Vol. 17, Issue 1; ISSN 1476-1122

Publisher:: Springer Nature - Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 146 works

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Title: Optical gain in colloidal quantum dots achieved with direct-current electrical pumping

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