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Title: Ultrahigh green and red optical gain cross sections from solutions of colloidal quantum well heterostructures
Authors: Delikanli, Savas
Erdem, Onur
Isik, Furkan
Dehghanpour Baruj, Hamed
Shabani, Farzan
Yagci, Huseyin Bilge
Durmusoglu, Emek Goksu
Demir, Hilmi Volkan
Keywords: Science::Chemistry
Issue Date: 2021
Source: Delikanli, S., Erdem, O., Isik, F., Dehghanpour Baruj, H., Shabani, F., Yagci, H. B., Durmusoglu, E. G. & Demir, H. V. (2021). Ultrahigh green and red optical gain cross sections from solutions of colloidal quantum well heterostructures. Journal of Physical Chemistry Letters, 12(9), 2177-2182.
Journal: Journal of Physical Chemistry Letters 
Abstract: We demonstrate amplified spontaneous emission (ASE) in solution with ultralow thresholds of 30 μJ/cm2 in red and of 44 μJ/cm2 in green from engineered colloidal quantum well (CQW) heterostructures. For this purpose, CdSe/CdS core/crown CQWs, designed to hit the green region, and CdSe/CdS@CdxZn1–xS core/crown@gradient-alloyed shell CQWs, further tuned to reach the red region by shell alloying, were employed to achieve high-performance ASE in the visible range. The net modal gain of these CQWs reaches 530 cm–1 for the green and 201 cm–1 for the red, 2–3 orders of magnitude larger than those of colloidal quantum dots (QDs) in solution. To explain the root cause for ultrahigh gain coefficient in solution, we show for the first time that the gain cross sections of these CQWs is ≥3.3 × 10–14 cm2 in the green and ≥1.3 × 10–14 cm2 in the red, which are two orders of magnitude larger compared to those of CQDs.
ISSN: 1948-7185
DOI: 10.1021/acs.jpclett.0c03836
Schools: School of Electrical and Electronic Engineering 
School of Materials Science and Engineering 
School of Physical and Mathematical Sciences 
Research Centres: LUMINOUS! Centre of Excellence for Semiconductor Lighting & Displays 
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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