近日，美国芝加哥大学Philippe Guyot-Sionnest团队研究了Purcell增强型中红外级联发光二极管。2026年2月24日出版的《自然—光子学》杂志发表了这项成果。

中红外光谱范围的光子源在气体传感和环境监测应用中备受关注。

研究组开发了一种新型溶液加工电致发光光源，其发射波长为5微米。该发光二极管基于HgSe/CdS胶体量子点的级联带内电致发光与共振等离子体蝴蝶结天线的集成。蝴蝶结结构提供了电极和用于珀塞尔增强的谐振腔，将电能聚焦到纳米间隙中，从而极大提升了发光效率。数值模拟指导了器件结构的设计，并预测了该结构的预期特性。

实验结果表明，这些器件表现出强烈的偏振带内电致发光，功率转换效率超过5%，相较于无蝴蝶结纳米间隙的参考结构提升了270倍。发光的上升和下降时间为20纳秒，证实了其电致发光起源。该方法展示了珀塞尔增强对中红外光源的优势，并为新型红外电光器件的发展带来了前景。

附：英文原文

Title: Purcell-enhanced mid-infrared cascade light-emitting diodes

Author: Caillas, Augustin, Shen, Xingyu, Guyot-Sionnest, Philippe

Issue&Volume: 2026-02-24

Abstract: Photon sources in the mid-infrared spectral range are of great interest for applications in gas sensing and environmental monitoring. Here we develop a new solution-processed electroluminescent source emitting at 5μm. Our light-emitting diode is based on integrating the cascade intraband electroluminescence of HgSe/CdS colloidal quantum dots with resonant plasmonic bowtie antennas. The bowtie provides the electrodes and the cavity for Purcell enhancement, funnelling the electrical power to the nanogap where the emission efficiency is highly enhanced. Numerical simulations guide the design of the device’s architecture and predict the expected characteristics of the structure. Experimentally, the devices exhibit strong polarized intraband electroluminescence, with power conversion efficiency exceeding 5% and a 270-fold increase over reference structures without the bowtie nanogap. The emission rise and fall times is 20ns, confirming its origin from electroluminescence. Our approach demonstrates the benefits of Purcell enhancement for mid-infrared light sources and holds promise for new infrared electro-optical devices.

DOI: 10.1038/s41566-026-01859-6

Source: https://www.nature.com/articles/s41566-026-01859-6