Electrically driven amplified spontaneous emission from colloidal quantum dots

Namyoung Ahn, Clément Livache, Valerio Pinchetti, Heeyoung Jung, Ho Jin, Donghyo Hahm, Young-Shin Park and Victor I. Klimov ()
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Namyoung Ahn: Los Alamos National Laboratory
Clément Livache: Los Alamos National Laboratory
Valerio Pinchetti: Los Alamos National Laboratory
Heeyoung Jung: Los Alamos National Laboratory
Ho Jin: Los Alamos National Laboratory
Donghyo Hahm: Los Alamos National Laboratory
Young-Shin Park: Los Alamos National Laboratory
Victor I. Klimov: Los Alamos National Laboratory

Nature, 2023, vol. 617, issue 7959, 79-85

Abstract: Abstract Colloidal quantum dots (QDs) are attractive materials for realizing solution-processable laser diodes that could benefit from size-controlled emission wavelengths, low optical-gain thresholds and ease of integration with photonic and electronic circuits1–7. However, the implementation of such devices has been hampered by fast Auger recombination of gain-active multicarrier states1,8, poor stability of QD films at high current densities9,10 and the difficulty to obtain net optical gain in a complex device stack wherein a thin electroluminescent QD layer is combined with optically lossy charge-conducting layers11–13. Here we resolve these challenges and achieve amplified spontaneous emission (ASE) from electrically pumped colloidal QDs. The developed devices use compact, continuously graded QDs with suppressed Auger recombination incorporated into a pulsed, high-current-density charge-injection structure supplemented by a low-loss photonic waveguide. These colloidal QD ASE diodes exhibit strong, broadband optical gain and demonstrate bright edge emission with instantaneous power of up to 170 μW.

Date: 2023
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DOI: 10.1038/s41586-023-05855-6

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