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Special Issue:
TOPICAL REVIEW — Exciton physics: Fundamentals, materials and devices
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| SPECIAL TOPIC — Exciton physics: Fundamentals, materials and devices |
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Exciton dynamics and random lasing in surface-passivated CdSe/CdSeS core/crown nanoplatelets |
| Huan Liu(刘欢)†, Puning Wang(王谱宁)†, and Rui Chen(陈锐)‡ |
| Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China |
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Abstract CdSe nanoplatelets (NPLs) are promising candidates for on-chip light sources, yet their performance is hindered by surface defects and inefficient optical gain. Herein, we demonstrate that CdSeS crown passivation significantly enhances the photophysical property of CdSe NPLs. Laser spectroscopy techniques reveal suppressed electronic and hole trapping at lateral surfaces, leading to a 4.2-fold increase in photoluminescence quantum yield and a shortened emission lifetime from 13.5 to 4.8 ns. In addition, amplified spontaneous emission is achieved under nanosecond pulse pumping, with thresholds of 0.75 to 0.16 mJ/cm$^{2}$ for CdSe and CdSe/CdSeS NPLs, respectively. By integrating CdSe/CdSeS NPLs with high-refractive-index SiO$_{2}$ scatters, coherent random lasing is realized at a threshold of 0.21 mJ/cm$^{2}$. These findings highlight the critical role of lateral surface passivation in optimizing optical gain and pave the way for low-cost, multifunctional nanophotonic devices.
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Received: 14 March 2025
Revised: 03 April 2025
Accepted manuscript online: 16 April 2025
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PACS:
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42.62.Fi
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(Laser spectroscopy)
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42.55.-f
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(Lasers)
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61.46.Df
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(Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))
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| Fund: This work is supported by the National Natural Science Foundation of China (Grant No. 62174079), Guangdong Provincial Quantum Science Strategic Initiative (Grant No. GDZX2404006), Science, Technology and Innovation Commission of Shenzhen Municipality (Grant No. JCYJ20220530113015035). |
Corresponding Authors:
Rui Chen
E-mail: chenr@sustech.edu.cn
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Cite this article:
Huan Liu(刘欢), Puning Wang(王谱宁), and Rui Chen(陈锐) Exciton dynamics and random lasing in surface-passivated CdSe/CdSeS core/crown nanoplatelets 2025 Chin. Phys. B 34 094201
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