Voltage-controlled reversible modulation of colloidal quantum dot thin film photoluminescence
Name
5.0093248.pdf
Description
Published version
Size
1.74 MB
Format
Adobe PDF
Checksum (MD5)
af27167d9b4693a59bdf7d23e1666e44
Author(s)
Xie, Sihan
Zhu, Han
Li, Melissa
Bulović, Vladimir
Date Issued
May 23, 2022
Journal
Applied Physics Letters
Publisher
AIP Publishing
Citation
Xie, Sihan, Zhu, Han, Li, Melissa and Bulović, Vladimir. 2022. "Voltage-controlled reversible modulation of colloidal quantum dot thin film photoluminescence." Applied Physics Letters, 120 (21).
Version
Final published version
Abstract
Active modulation of quantum dot thin film photoluminescence (PL) has been far-reaching potential applications in biomedical and optoelectronic systems, but challenges remain in achieving large PL modulation depth and fast temporal response. Here, we report an efficient voltage-controlled optical down-converter by optically exciting a colloidal quantum dot thin film within a quantum dot light-emitting diode under reverse bias. Utilizing field-induced luminescence quenching, we show that a large electric field can strongly modify carrier dynamics in this nanostructured device, resulting in stable and reversible photoluminescence quenching. The device exhibits photoluminescence reduction of up to 99.5%, corresponding to a contrast ratio of 200:1 under the applied electric field of 3 MV cm−1 with a 300 ns response time. Using excitation wavelength dependent and transient PL spectroscopy, we further show that the high degree of quenching is achieved by a synergistic interplay of quantum-confined Stark effect and field-induced exciton dissociation.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1063/5.0093248
