Exciton dynamics and random lasing in surface-passivated CdSe/CdSeS core/crown nanoplatelets

doi:10.1088/1674-1056/adcd46

中国物理B ›› 2025, Vol. 34 ›› Issue (9): 94201-094201.doi: 10.1088/1674-1056/adcd46

所属专题： TOPICAL REVIEW — Exciton physics: Fundamentals, materials and devices

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

收稿日期:2025-03-14 修回日期:2025-04-03 接受日期:2025-04-16 出版日期:2025-08-21 发布日期:2025-08-28
通讯作者: Rui Chen E-mail:chenr@sustech.edu.cn
基金资助:
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).

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

Received:2025-03-14 Revised:2025-04-03 Accepted:2025-04-16 Online:2025-08-21 Published:2025-08-28
Contact: Rui Chen E-mail:chenr@sustech.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: CdSe nanoplatelets, core/crown heterostructures, surface passivation, amplified spontaneous emission, random lasing

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.

Key words: CdSe nanoplatelets, core/crown heterostructures, surface passivation, amplified spontaneous emission, random lasing

中图分类号: (Laser spectroscopy)

42.62.Fi

42.55.-f (Lasers) 61.46.Df (Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots))

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[J]. 中国物理B, 2025, 34(9): 94201-094201.

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[J]. Chin. Phys. B, 2025, 34(9): 94201-094201.

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Exciton dynamics and random lasing in surface-passivated CdSe/CdSeS core/crown nanoplatelets

Exciton dynamics and random lasing in surface-passivated CdSe/CdSeS core/crown nanoplatelets

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