TY - JOUR
T1 - Sub-single exciton optical gain threshold in colloidal semiconductor quantum wells with gradient alloy shelling
AU - Taghipour, Nima
AU - Delikanli, Savas
AU - Shendre, Sushant
AU - Sak, Mustafa
AU - Li, Mingjie
AU - Isik, Furkan
AU - Tanriover, Ibrahim
AU - Guzelturk, Burak
AU - Sum, Tze Chien
AU - Demir, Hilmi Volkan
N1 - Funding Information:
We gratefully acknowledge the financial support in part from Singapore National Research Foundation under the programs of NRF-NRFI2016-08, NRF-CRP14-2014-03, and the Science and Engineering Research Council, Agency for Science, Technology, and Research (A*STAR) of Singapore and in part from TUBITAK 115E679, 115F279, and 117E713. T.C.S. and M.L. acknowledge the support from Singapore National Research Foundation through the Competitive Research Programme (CRP Award No. NRF-CRP14-2014-03). H.V.D. also acknowledges support from TUBA.
Publisher Copyright:
© 2020, The Author(s).
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/7/3
Y1 - 2020/7/3
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85087422180
U2 - 10.1038/s41467-020-17032-8
DO - 10.1038/s41467-020-17032-8
M3 - Journal article
C2 - 32620749
AN - SCOPUS:85087422180
SN - 2041-1723
VL - 11
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 3305
ER -