Exciton Localization Engineering in Thermally Evaporated Yb-Doped CsPbCl3 Near-Infrared Light-Emitting Diodes.

IF 26.8 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Materials Pub Date : 2025-10-17 DOI:10.1002/adma.202513853

Shuo Wang,Shuhan Zhang,Xin Li,Dan Huang,William W Yu,Liang Wang

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Abstract

Near-infrared (NIR) emission underpins biomedical imaging, night vision, and optical communication. Yb3+-doped CsPbCl3 have demonstrated ultrahigh photoluminescence quantum yields via quantum cutting, primarily enabled by a singular defect-assisted energy transfer pathway arising from the substitution of Pb2+ by Yb3+. However, whether additional pathways exist to facilitate visible (VIS)-to-NIR conversion, thereby further enhancing the performance of NIR-emissive devices, remains an open and compelling question. Here, strategic engineering of localized bound excitons (BEs) is proposed in the thermally evaporated CsPbCl3:Yb system. Assisted BEs significantly promote energy transfer from CsPbCl3 matrix to Yb dopants, unveiling a previously unknown excitonic energy transfer channel. Atomic-scale characterization combined with first-principles calculations uncovers a BE-driven excitonic transfer mechanism, specifically implicating Cs-vacancy-induced defects in mediating exciton behavior. These insights lead to the fabrication of high-performance NIR-LEDs with an 8.9% external quantum efficiency and 410 mW·Sr-1·m-2 radiance, marking a breakthrough in thermally evaporated NIR (>950 nm) light-emitting diodes.

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热蒸发掺镱CsPbCl3近红外发光二极管的激子局域化工程。

近红外（NIR）发射是生物医学成像、夜视和光通信的基础。Yb3+掺杂的CsPbCl3通过量子切割表现出了超高的光致发光量子产率，主要是由Yb3+取代Pb2+产生的单一缺陷辅助能量转移途径实现的。然而，是否存在其他途径来促进可见光（VIS）到近红外的转换，从而进一步提高近红外发射器件的性能，仍然是一个开放和令人信服的问题。本文提出了热蒸发CsPbCl3:Yb体系中局域束缚激子（BEs）的策略工程。辅助BEs显著促进了CsPbCl3基体向Yb掺杂物的能量转移，揭示了一个以前未知的激子能量转移通道。原子尺度表征结合第一性原理计算揭示了be驱动的激子转移机制，特别暗示了cs空位诱导的激子行为缺陷。这些见解导致了高性能NIR- led的制造，其外部量子效率为8.9%，辐射强度为410 mW·Sr-1·m-2，标志着热蒸发NIR （>950 nm）发光二极管的突破。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advanced Materials 工程技术-材料科学：综合

CiteScore

43.00

自引率

4.10%

发文量

2182

审稿时长

2 months

期刊介绍： Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.