Minimizing Interfacial Energy Losses with Carbon Dot Bifacial Modification Layers for High-Efficiency and Stable Perovskite LEDs

IF 18.5 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Functional Materials Pub Date : 2025-02-16 DOI:10.1002/adfm.202423608

Zhibin Wang, Song Zheng, Naizhong Jiang, Hailiang Huang, Ximing Wu, Ruidan Zhang, Yang Lin, Longqi Lin, Xin Zhou, Rui Zeng, Tao Pang, Tianmin Wu, Feng Huang, Daqin Chen

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Abstract

Perovskite light-emitting diodes (PeLEDs) have reached near-unity photoluminescent quantum yields (PLQYs), but further improvements in electroluminescent efficiency are constrained by interfacial energy losses between the emissive layer and charge transport layers. In this study, multifunctional carbon dot organic frameworks (CDOFs) are introduced as a dual-interface modification material for perovskite layer. This approach effectively passivates both the upper and buried interfaces, boosting the PLQY to nearly 100% and enabling an external quantum efficiency of 28.0%. The CDOFs also facilitate balanced charge injection, achieving a low turn-on voltage of only 1.9 V, significantly below the bandgap voltage. Additionally, the exceptional defect passivation imparted by CDOFs significantly bolsters structural stability, achieving a T₅₀ operational lifetime of 81.7 min at an initial ultrahigh luminance of 10 000 cd m⁻², with no detectable Joule heating. This study underscores the potential of CDOFs in significantly advancing PeLED performance.

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来源期刊

Advanced Functional Materials 工程技术-材料科学：综合

CiteScore

29.50

自引率

4.20%

发文量

2086

审稿时长

2.1 months

期刊介绍： Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.