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:
-
[1];
[2];
[3]
- 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)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (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); 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. https://doi.org/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. https://doi.org/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 = {Mon Nov 20 00:00:00 EST 2017},
month = {Mon Nov 20 00:00:00 EST 2017}
}
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