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Title: Electrically control amplified spontaneous emission in colloidal quantum dots
Authors: Yu, Junhong
Shendre, Sushant
Koh, Weon-Kyu
Liu, Baiquan
Li, Mingjie
Hou, Songyan
Hettiarachchi, Chathuranga
Delikanli, Savas
Hernández-Martínez, Pedro
Muhammad Danang Birowosuto
Wang, Hong
Sum, Tze Chien
Demir, Hilmi Volkan
Dang, Cuong
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2019
Source: Yu, J., Shendre, S., Koh, W.-K., Liu, B., Li, M., Hou, S., . . . Dang, C. (2019). Electrically control amplified spontaneous emission in colloidal quantum dots. Science Advances, 5(10), eaav3140-. doi:10.1126/sciadv.aav3140
Journal: Science Advances
Abstract: Colloidal quantum dots (CQDs) are highly promising materials for light amplification thanks to their efficient photoluminescence, tunable emission wavelength and low-cost synthesis. Unfortunately, CQDs are suffering from band-edge state degeneracy which demands multiple excitons to achieve population inversion. As a result, non-radiative Auger recombination increases the lasing threshold and limits the gain lifetime. Here, benefiting from the negative charging, we demonstrate that the amplified spontaneous emission (ASE) threshold is controllable in a device where CQD film is exposed to an external electric field. Specifically, singly charged CQDs lower the threshold due to the preexisting electron in the conduction band, while strongly enhanced Auger recombination in doubly charged CQDs stymies the ASE. Experimental results and kinetic equation model show that ASE threshold reduces 10% even if our device only charges ~17% of the CQD population. Our results open new possibilities for controlling exciton recombination dynamics and achieving electrically pumped CQD lasers.
ISSN: 2375-2548
DOI: 10.1126/sciadv.aav3140
Rights: Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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