Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/140206
Title: Record high external quantum efficiency of 19.2% achieved in light-emitting diodes of colloidal quantum wells enabled by hot-injection shell growth
Authors: Liu, Baiquan
Altintas, Yemliha
Wang, Lin
Shendre, Sushant
Sharma, Manoj
Sun, Handong
Mutlugun, Evren
Demir, Hilmi Volkan
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2020
Source: Liu, B., Altintas, Y., Wang, L., Shendre, S., Sharma, M., Sun, H., . . . Demir, H. V. (2020). Record high external quantum efficiency of 19.2% achieved in light-emitting diodes of colloidal quantum wells enabled by hot-injection shell growth. Advanced Materials, 32(8), 1905824-. doi:10.1002/adma.201905824
Journal: Advanced Materials
Abstract: Colloidal quantum wells (CQWs) are regarded as a highly promising class of optoelectronic materials, thanks to their unique excitonic characteristics of high extinction coefficients and ultranarrow emission bandwidths. Although the exploration of CQWs in light-emitting diodes (LEDs) is impressive, the performance of CQW-LEDs lags far behind other types of soft-material LEDs (e.g., organic LEDs, colloidal-quantum-dot LEDs, and perovskite LEDs). Herein, high-efficiency CQW-LEDs reaching close to the theoretical limit are reported. A key factor for this high performance is the exploitation of hot-injection shell (HIS) growth of CQWs, which enables a near-unity photoluminescence quantum yield (PLQY), reduces nonradiative channels, ensures smooth films, and enhances the stability. Remarkably, the PLQY remains 95% in solution and 87% in film despite rigorous cleaning. Through systematically understanding their shape-, composition-, and device-engineering, the CQW-LEDs using CdSe/Cd0.25 Zn0.75 S core/HIS CQWs exhibit a maximum external quantum efficiency of 19.2%. Additionally, a high luminance of 23 490 cd m-2 , extremely saturated red color with the Commission Internationale de L'Eclairage (CIE) coordinates of (0.715, 0.283), and stable emission are obtained. The findings indicate that HIS-grown CQWs enable high-performance solution-processed LEDs, which may pave the path for future CQW-based display and lighting technologies.
URI: https://hdl.handle.net/10356/140206
ISSN: 0935-9648
DOI: 10.1002/adma.201905824
Rights: This is the accepted version of the following article: Liu, B., Altintas, Y., Wang, L., Shendre, S., Sharma, M., Sun, H., . . . Demir, H. V. (2020). Record high external quantum efficiency of 19.2% achieved in light-emitting diodes of colloidal quantum wells enabled by hot-injection shell growth. Advanced materials, 32(8), 1905824-., which has been published in final form at doi:10.1002/adma.201905824. This article may be used for non-commercial purposes in accordance with the Wiley Self-Archiving Policy [https://authorservices.wiley.com/authorresources/Journal-Authors/licensing/self-archiving.html].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles
SPMS Journal Articles

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