Enhancement of Optical Gain in Colloidal CdSe/CdS/ZnS Quantum Dots through Nanosecond Optical Pumping,The Journal of Physical Chemistry Letters

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Enhancement of Optical Gain in Colloidal CdSe/CdS/ZnS Quantum Dots through Nanosecond Optical Pumping
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2024-02-07 , DOI: 10.1021/acs.jpclett.4c00123
Suhyeon Kim ₁ , Suhyeon Hwang ₁ , Jiwon Bang ₁

Affiliation

Optical gain and lasing in colloidal nanocrystals are often hindered by sub-nanosecond rapid Auger non-radiative recombination, especially under continuous wave optical or electrical excitation. This study demonstrates amplified spontaneous emission (ASE) from CdSe/CdS/ZnS quantum dot (QD) solids through prolonged pulsed optical pumping over 10 ns. The incorporation of CdS and ZnS double shells on CdSe QDs effectively decelerates the Auger process in multiexcitonic states by extending the electron wave function and enhancing dielectric screening. Furthermore, we engineer smooth, densely packed QD solid films that efficiently guide the optical mode, achieving substantial net gain values under nanosecond pumping. The proposed approach helps observe ASE with gain thresholds of 0.84 and 1.5 mJ/cm² under optical pumping pulse widths of 6 and 15 ns, respectively. This advancement can promote continuous pumping in colloidal QD gain systems, opening new avenues for optoelectronic applications.

中文翻译：

通过纳秒光泵浦增强胶体 CdSe/CdS/ZnS 量子点的光学增益

胶体纳米晶体中的光学增益和激光常常受到亚纳秒快速俄歇非辐射复合的阻碍，特别是在连续波光或电激发下。这项研究展示了通过超过 10 ns 的长时间脉冲光泵浦，CdSe/CdS/ZnS 量子点 (QD) 固体的放大自发发射 (ASE)。在 CdSe 量子点上掺入 CdS 和 ZnS 双壳层，通过扩展电子波函数和增强介电屏蔽，有效地减缓了多激子态的俄歇过程。此外，我们设计了光滑、致密的 QD 固体薄膜，可有效引导光学模式，在纳秒泵浦下实现可观的净增益值。所提出的方法有助于在6 ns 和15 ns 的光泵浦脉冲宽度下观察增益阈值分别为0.84 和1.5 mJ/cm ²的ASE。这一进步可以促进胶体量子点增益系统的连续泵浦，为光电应用开辟新途径。

更新日期：2024-02-07

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