Achieving Narrowed Bandgaps and Blue-Light Excitability in Zero-Dimensional Hybrid Metal Halide Phosphors via Introducing Cation-Cation Bonding

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外文摘要：Zero-dimensional(0D)hybrid metal halides,which consist of organic cations and isolated inorganic metal halide anions,have emerged as phosphors with efficient broadband emissions.However,these materials generally have too wide bandgaps and thus cannot be excited by blue light,which hinders their applications for efficient white light-emitting diodes(WLEDs).The key to achieving a blue-light-excitable 0D hybrid metal halide phosphor is to reduce the fundamental bandgap by rational chemical design.In this work,we report two designed hybrid copper(I)iodides,(Ph3MeP)2Cu4I6 and(Cy3MeP)2Cu4I6,as blue-light-excitable yellow phosphors with ultrabroadband emission.In these compounds,the[Cu4I6]2-anion forms an I6 octahedron centered on a cationic Cu4 tetrahedron.The strong cation-cation bonding within the unique cationic Cu4 tetrahedra enables significantly lowered conduction band minimums and thus narrowed bandgaps,as compared to other reported hybrid copper(I)iodides.The ultrabroadband emission is attributed to the coexistence of free and self-trapped excitons.The WLED using the[Cu4I6]2-anion-based single phosphor shows warm white light emission,with a high luminous efficiency of 65 Im W-1 and a high color rendering index of 88.This work provides strategies to design narrow-bandgap 0D hybrid metal halides and presents two first examples of blue-light-excitable 0D hybrid metal halide phosphors for efficient WLEDs.

外文关键词：

blue-light-excitablecation-cation bondinghybrid metal halidephosphorzero-dimensional

作者：

Pengfei Fu、Shining Geng、Ruixiang Mi、Ranyun Wu、Guangya Zheng、Binbin Su、Zhiguo Xia、Guangda Niu、Jiang Tang、Zewen Xiao

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作者单位：

Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China

The State Key Laboratory of Luminescent Materials and Devices,Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques,School of Materials Science and Technology,South China University of Technology,Guangzhou 510640,China

School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,China

出版年：

2024

DOI：

10.1002/eem2.12518

能源与环境材料(英文)

ISSN：

年,卷(期)：2024.7(1)