Voltage-controlled reversible modulation of colloidal quantum dot thin film photoluminescence
<jats:p> 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-contro...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing
2022
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| Online Access: | https://hdl.handle.net/1721.1/145493 |
| _version_ | 1811073179907522560 |
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| author | Xie, Sihan Zhu, Han Li, Melissa Bulović, Vladimir |
| author2 | Massachusetts Institute of Technology. Research Laboratory of Electronics |
| author_facet | Massachusetts Institute of Technology. Research Laboratory of Electronics Xie, Sihan Zhu, Han Li, Melissa Bulović, Vladimir |
| author_sort | Xie, Sihan |
| collection | MIT |
| description | <jats:p> 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<jats:sup>−1</jats:sup> 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. </jats:p> |
| first_indexed | 2024-09-23T09:29:37Z |
| format | Article |
| id | mit-1721.1/145493 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T09:29:37Z |
| publishDate | 2022 |
| publisher | AIP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1454932022-09-26T11:45:41Z Voltage-controlled reversible modulation of colloidal quantum dot thin film photoluminescence Xie, Sihan Zhu, Han Li, Melissa Bulović, Vladimir Massachusetts Institute of Technology. Research Laboratory of Electronics Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science <jats:p> 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<jats:sup>−1</jats:sup> 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. </jats:p> 2022-09-19T16:58:15Z 2022-09-19T16:58:15Z 2022-05-23 2022-09-19T16:50:14Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/145493 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). en 10.1063/5.0093248 Applied Physics Letters Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf AIP Publishing American Institute of Physics (AIP) |
| spellingShingle | Xie, Sihan Zhu, Han Li, Melissa Bulović, Vladimir Voltage-controlled reversible modulation of colloidal quantum dot thin film photoluminescence |
| title | Voltage-controlled reversible modulation of colloidal quantum dot thin film photoluminescence |
| title_full | Voltage-controlled reversible modulation of colloidal quantum dot thin film photoluminescence |
| title_fullStr | Voltage-controlled reversible modulation of colloidal quantum dot thin film photoluminescence |
| title_full_unstemmed | Voltage-controlled reversible modulation of colloidal quantum dot thin film photoluminescence |
| title_short | Voltage-controlled reversible modulation of colloidal quantum dot thin film photoluminescence |
| title_sort | voltage controlled reversible modulation of colloidal quantum dot thin film photoluminescence |
| url | https://hdl.handle.net/1721.1/145493 |
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