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

Jaehoon Lim, Young Shin Park, Victor I Klimov

Research output: Contribution to journalArticle

32 Citations (Scopus)

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 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.

Original languageEnglish
Pages (from-to)42-48
Number of pages7
JournalNature Materials
Volume17
Issue number1
DOIs
Publication statusPublished - Jan 1 2018

Fingerprint

Pumping (laser)
Optical gain
Semiconductor quantum dots
pumping
direct current
quantum dots
population inversion
injection
lasing
Electroluminescence
electroluminescence
Nanocrystals
quantitative analysis
high current
Semiconductor lasers
nanocrystals
Current density
Demonstrations
semiconductor lasers
retarding

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Optical gain in colloidal quantum dots achieved with direct-current electrical pumping. / Lim, Jaehoon; Park, Young Shin; Klimov, Victor I.

In: Nature Materials, Vol. 17, No. 1, 01.01.2018, p. 42-48.

Research output: Contribution to journalArticle

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