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

Taghipour, Nima; Delikanli, Savas; Shendre, Sushant; Sak, Mustafa; Li, Mingjie; Isik, Furkan; Tanriover, Ibrahim; Guzelturk, Burak; Sum, Tze Chien; Demir, Hilmi Volkan

doi:10.1038/s41467-020-17032-8

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

Journal Article · 02 July 2020 · Nature Communications

DOI: https://doi.org/10.1038/s41467-020-17032-8 · OSTI ID:1774318

Taghipour, Nima ^[1]; Delikanli, Savas ^[2]; Shendre, Sushant ^[3]; Sak, Mustafa ^[1]; Li, Mingjie ^[3]; Isik, Furkan ^[1]; Tanriover, Ibrahim ^[1];

^[4];

^[3];

^[2]

Bilkent University, Ankara (Turkey)
Bilkent University, Ankara (Turkey); Nanyang Technological Univ. (Singapore)
Nanyang Technological Univ. (Singapore)
Argonne National Lab. (ANL), Lemont, IL (United States). Advanced Photon Source (APS)

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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Research Foundation Singapore (NRF); Science and Engineering Research Council, Agency for Science, Technology, and Research (A*STAR); Scientific and Technological Research Council of Turkey (TUBITAK); USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1774318

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 11; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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