Electrically control amplified spontaneous emission in colloidal quantum dots
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 populatio...
| Main Authors: | , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/139758 |
| _version_ | 1811690249362866176 |
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| author | 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 |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering 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 |
| author_sort | Yu, Junhong |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T06:01:00Z |
| format | Journal Article |
| id | ntu-10356/139758 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:01:00Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1397582021-05-01T20:12:10Z Electrically control amplified spontaneous emission in colloidal quantum dots 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 School of Electrical and Electronic Engineering School of Physical and Mathematical Sciences LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays CINTRA UMI CNRS/NTU/THALES Centre for OptoElectronics and Biophotonics The Photonics Institute Research Techno Plaza Engineering::Electrical and electronic engineering Optical Gain Electric Control 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. NRF (Natl Research Foundation, S’pore) ASTAR (Agency for Sci., Tech. and Research, S’pore) MOE (Min. of Education, S’pore) Published version 2020-05-21T06:48:57Z 2020-05-21T06:48:57Z 2019 Journal Article 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 2375-2548 https://hdl.handle.net/10356/139758 10.1126/sciadv.aav3140 31692653 2-s2.0-85074564463 10 5 1 of 10 10 of 10 en Science Advances 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). application/pdf |
| spellingShingle | Engineering::Electrical and electronic engineering Optical Gain Electric Control 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 Electrically control amplified spontaneous emission in colloidal quantum dots |
| title | Electrically control amplified spontaneous emission in colloidal quantum dots |
| title_full | Electrically control amplified spontaneous emission in colloidal quantum dots |
| title_fullStr | Electrically control amplified spontaneous emission in colloidal quantum dots |
| title_full_unstemmed | Electrically control amplified spontaneous emission in colloidal quantum dots |
| title_short | Electrically control amplified spontaneous emission in colloidal quantum dots |
| title_sort | electrically control amplified spontaneous emission in colloidal quantum dots |
| topic | Engineering::Electrical and electronic engineering Optical Gain Electric Control |
| url | https://hdl.handle.net/10356/139758 |
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