Colloidal CdSe/CdS core/crown nanoplatelets for efficient blue light emission and optical amplification
- Author
- Carmelita Rodà, Alessio Di Giacomo, Lucía Camila Tasende Rodríguez, Chandra Sekhar Mutyala (UGent) , Jari Leemans, Zeger Hens (UGent) , Pieter Geiregat (UGent) and Iwan Moreels (UGent)
- Organization
- Project
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- PHOCONA (Photonics in Flatland: Band Structure Engineering of 2D Excitons in Fluorescent Colloidal Nanomaterials)
- Making Nanomaterials Work
- Excitons and Excitonic Complexes in Colloidal Nanocrystals: Impact of Dimensionality, Crystal Structure and Surface (CONEX)
- Cofinanciering core facility - Transmissie Elektronenmicroscopie (TEM)
- Abstract
- The application of CdSe nanoplatelets (NPLs) in the ultraviolet/ blue region remains an open challenge due to charge trapping typically leading to limited photoluminescence quantum efficiency (PL QE) and sub-bandgap emission in core-only NPLs. Here, we synthesized 3.5 monolayer core/crown CdSe/CdS NPLs with various crown dimensions, exhibiting saturated blue emission and PL QE up to 55%. Compared to core-only NPLs, the PL intensity decays monoexponentially over two decades due to suppressed deep trapping and delayed emission. In both core-only and core/crown NPLs we observe biexcitonmediated optical gain between 470 and 510 nm, with material gain coefficients up to 7900 cm-1 and consistently lower gain thresholds in crowned NPLs. Gain lifetimes are limited to 40 ps, due to residual ultrafast trapping and higher exciton densities at threshold. Our results provide guidelines for rational optimization of thin CdSe NPLs toward lighting and light-amplification applications.
- Keywords
- AMPLIFIED SPONTANEOUS EMISSION, THRESHOLD STIMULATED-EMISSION, GAIN, GREEN, ABSORPTION, THICKNESS, BLINKING, RED, colloidal nanoplatelets, transient absorption spectroscopy, stimulated, emission, optical gain
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Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-01H149MWA467CJFH5EZZJHBYX2
- MLA
- Rodà, Carmelita, et al. “Colloidal CdSe/CdS Core/Crown Nanoplatelets for Efficient Blue Light Emission and Optical Amplification.” NANO LETTERS, vol. 23, no. 8, 2023, pp. 3224–30, doi:10.1021/acs.nanolett.2c05061.
- APA
- Rodà, C., Di Giacomo, A., Tasende Rodríguez, L. C., Mutyala, C. S., Leemans, J., Hens, Z., … Moreels, I. (2023). Colloidal CdSe/CdS core/crown nanoplatelets for efficient blue light emission and optical amplification. NANO LETTERS, 23(8), 3224–3230. https://doi.org/10.1021/acs.nanolett.2c05061
- Chicago author-date
- Rodà, Carmelita, Alessio Di Giacomo, Lucía Camila Tasende Rodríguez, Chandra Sekhar Mutyala, Jari Leemans, Zeger Hens, Pieter Geiregat, and Iwan Moreels. 2023. “Colloidal CdSe/CdS Core/Crown Nanoplatelets for Efficient Blue Light Emission and Optical Amplification.” NANO LETTERS 23 (8): 3224–30. https://doi.org/10.1021/acs.nanolett.2c05061.
- Chicago author-date (all authors)
- Rodà, Carmelita, Alessio Di Giacomo, Lucía Camila Tasende Rodríguez, Chandra Sekhar Mutyala, Jari Leemans, Zeger Hens, Pieter Geiregat, and Iwan Moreels. 2023. “Colloidal CdSe/CdS Core/Crown Nanoplatelets for Efficient Blue Light Emission and Optical Amplification.” NANO LETTERS 23 (8): 3224–3230. doi:10.1021/acs.nanolett.2c05061.
- Vancouver
- 1.Rodà C, Di Giacomo A, Tasende Rodríguez LC, Mutyala CS, Leemans J, Hens Z, et al. Colloidal CdSe/CdS core/crown nanoplatelets for efficient blue light emission and optical amplification. NANO LETTERS. 2023;23(8):3224–30.
- IEEE
- [1]C. Rodà et al., “Colloidal CdSe/CdS core/crown nanoplatelets for efficient blue light emission and optical amplification,” NANO LETTERS, vol. 23, no. 8, pp. 3224–3230, 2023.
@article{01H149MWA467CJFH5EZZJHBYX2,
abstract = {{The application of CdSe nanoplatelets (NPLs) in the ultraviolet/ blue region remains an open challenge due to charge trapping typically leading to limited photoluminescence quantum efficiency (PL QE) and sub-bandgap emission in core-only NPLs. Here, we synthesized 3.5 monolayer core/crown CdSe/CdS NPLs with various crown dimensions, exhibiting saturated blue emission and PL QE up to 55%. Compared to core-only NPLs, the PL intensity decays monoexponentially over two decades due to suppressed deep trapping and delayed emission. In both core-only and core/crown NPLs we observe biexcitonmediated optical gain between 470 and 510 nm, with material gain coefficients up to 7900 cm-1 and consistently lower gain thresholds in crowned NPLs. Gain lifetimes are limited to 40 ps, due to residual ultrafast trapping and higher exciton densities at threshold. Our results provide guidelines for rational optimization of thin CdSe NPLs toward lighting and light-amplification applications.}},
author = {{Rodà, Carmelita and Di Giacomo, Alessio and Tasende Rodríguez, Lucía Camila and Mutyala, Chandra Sekhar and Leemans, Jari and Hens, Zeger and Geiregat, Pieter and Moreels, Iwan}},
issn = {{1530-6984}},
journal = {{NANO LETTERS}},
keywords = {{AMPLIFIED SPONTANEOUS EMISSION,THRESHOLD STIMULATED-EMISSION,GAIN,GREEN,ABSORPTION,THICKNESS,BLINKING,RED,colloidal nanoplatelets,transient absorption spectroscopy,stimulated,emission,optical gain}},
language = {{eng}},
number = {{8}},
pages = {{3224--3230}},
title = {{Colloidal CdSe/CdS core/crown nanoplatelets for efficient blue light emission and optical amplification}},
url = {{http://doi.org/10.1021/acs.nanolett.2c05061}},
volume = {{23}},
year = {{2023}},
}
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