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Sub-single exciton optical gain threshold in colloidal semiconductor quantum wells with gradient alloy shelling

Author

Listed:
  • Nima Taghipour

    (Bilkent University)

  • Savas Delikanli

    (Bilkent University
    Nanyang Technological University)

  • Sushant Shendre

    (Nanyang Technological University)

  • Mustafa Sak

    (Bilkent University)

  • Mingjie Li

    (Nanyang Technological University)

  • Furkan Isik

    (Bilkent University)

  • Ibrahim Tanriover

    (Bilkent University)

  • Burak Guzelturk

    (Advanced Photon Source, Argonne National Laboratory)

  • Tze Chien Sum

    (Nanyang Technological University)

  • Hilmi Volkan Demir

    (Bilkent University
    Nanyang Technological University
    Nanyang Technological University)

Abstract

Colloidal semiconductor quantum wells have emerged as a promising material platform for use in solution-processable lasers. However, applications relying on their optical gain suffer from nonradiative Auger decay due to multi-excitonic nature of light amplification in II-VI semiconductor nanocrystals. Here, we show sub-single exciton level of optical gain threshold in specially engineered CdSe/CdS@CdZnS core/crown@gradient-alloyed shell quantum wells. This sub-single exciton ensemble-averaged gain threshold of (Ng)≈ 0.84 (per particle) resulting from impeded Auger recombination, along with a large absorption cross-section of quantum wells, enables us to observe the amplified spontaneous emission starting at an ultralow pump fluence of ~ 800 nJ cm−2, at least three-folds better than previously reported values among all colloidal nanocrystals. Finally, using these gradient shelled quantum wells, we demonstrate a vertical cavity surface-emitting laser operating at a low lasing threshold of 7.5 μJ cm−2. These results represent a significant step towards the realization of solution-processable electrically-driven colloidal lasers.

Suggested Citation

  • Nima Taghipour & Savas Delikanli & Sushant Shendre & Mustafa Sak & Mingjie Li & Furkan Isik & Ibrahim Tanriover & Burak Guzelturk & Tze Chien Sum & Hilmi Volkan Demir, 2020. "Sub-single exciton optical gain threshold in colloidal semiconductor quantum wells with gradient alloy shelling," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-17032-8
    DOI: 10.1038/s41467-020-17032-8
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