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

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. 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)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of New Mexico, Albuquerque, NM (United States). Centre for High Technology Materials
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1412893
Report Number(s):
LA-UR-17-20393; LA-UR-19-29402
Journal ID: ISSN 1476-1122; TRN: US1800399
Grant/Contract Number:  
AC52-06NA25396; 89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Nature Materials
Additional Journal Information:
Journal Volume: 17; Journal Issue: 1; Journal ID: ISSN 1476-1122
Publisher:
Springer Nature - Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; quantum dot; population inversion; laser; electrical pumping

Citation Formats

Lim, Jaehoon, Park, Young-Shin, and Klimov, Victor Ivanovich. Optical gain in colloidal quantum dots achieved with direct-current electrical pumping. United States: N. p., 2017. Web. doi:10.1038/nmat5011.
Lim, Jaehoon, Park, Young-Shin, & Klimov, Victor Ivanovich. Optical gain in colloidal quantum dots achieved with direct-current electrical pumping. United States. doi:10.1038/nmat5011.
Lim, Jaehoon, Park, Young-Shin, and Klimov, Victor Ivanovich. Mon . "Optical gain in colloidal quantum dots achieved with direct-current electrical pumping". United States. doi:10.1038/nmat5011. https://www.osti.gov/servlets/purl/1412893.
@article{osti_1412893,
title = {Optical gain in colloidal quantum dots achieved with direct-current electrical pumping},
author = {Lim, Jaehoon and Park, Young-Shin and Klimov, Victor Ivanovich},
abstractNote = {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.},
doi = {10.1038/nmat5011},
journal = {Nature Materials},
number = 1,
volume = 17,
place = {United States},
year = {2017},
month = {11}
}

Journal Article:
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Cited by: 23 works
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