Two-band optical gain and ultrabright electroluminescence from colloidal quantum dots at 1000 A cm−2

Jung, Heeyoung; Park, Young-Shin; Ahn, Namyoung; Lim, Jaehoon; Fedin, Igor; Livache, Clément; Klimov, Victor I.

doi:10.1038/s41467-022-31189-4

Title: Two-band optical gain and ultrabright electroluminescence from colloidal quantum dots at 1000 A cm−2

Journal Article · 28 June 2022 · Nature Communications

DOI: https://doi.org/10.1038/s41467-022-31189-4 · OSTI ID:1874419

Jung, Heeyoung;

;

; Fedin, Igor; Livache, Clément;

Abstract Colloidal quantum dots (QDs) are attractive materials for the realization of solution-processable laser diodes. Primary challenges towards this objective are fast optical-gain relaxation due to nonradiative Auger recombination and poor stability of colloidal QD solids under high current densities required to obtain optical gain. Here we resolve these challenges and achieve broad-band optical gain spanning the band-edge (1S) and the higher-energy (1P) transitions. This demonstration is enabled by continuously graded QDs with strongly suppressed Auger recombination and a current-focusing device design, combined with short-pulse pumping. Using this approach, we achieve ultra-high current densities (~1000 A cm ⁻² ) and brightness (~10 million cd m ⁻² ), and demonstrate an unusual two-band electroluminescence regime for which the 1P band is more intense than the 1S feature. This implies the realization of extremely large QD occupancies of up to ~8 excitons per-dot, which corresponds to complete filling of the 1S and 1P electron shells.

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

Sponsoring Organization:: USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1874419

Report Number(s):: LA-UR-22-24389; 3734; PII: 31189

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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