Abstract
Zero-dimensional (0D) metal halides are in a blossoming status for their fascinating optoelectronic properties. Herein, an antimony-based metal halide of (C16H28N)2SbCl5 (C16H28N+ = benzyltripropylammonium cations), where the isolated [SbCl5]2− clusters are surrounded by C16H28N+ to form a 0D square-pyramidal structure, was synthesized and investigated. The (C16H28N)2SbCl5 exhibited a broadband orange emission at 633 nm upon the low-energy irradiation (400 nm) with a near-unity photoluminescence quantum efficiency (97.8%). Interestingly, (C16H28N)2SbCl5 showed an additional emission peak at 477 nm upon the higher-energy irradiation (300 nm), which is attributed to the transformation of the doublet of spin-orbit couplings into two independent self-trapped excitons (STEs). Temperature-dependent Raman spectra clearly revealed the characteristics of multi-phonon coupling, demonstrating a strong anharmonic electron-phonon interaction in (C16H28N)2SbCl5. Temperature-dependent emission spectra and density functional theory results illustrated that the observed dual-band emission originated from singlet and triplet STEs in [SbCl5]2− units. Combined with the efficient emission and excellent stability of (C16H28N)2SbCl5, a stable white-light-emitting diode with an ultra-high color rendering index of 96.6 was fabricated.
摘要
零维金属卤化物因其迷人的光电特性而处于蓬勃发展的状态. 本文报道了一种(C16H28N)2SbCl5(C16H28N+ = 苄基三丙基铵阳离子)的锑基金属卤化物, 其中孤立的[SbCl5]2−团簇被C16H28N+包围, 形成零维方形金字塔结构. (C16H28N)2SbCl5在低能辐照(400 nm)时在633 nm处呈现宽带橙色发射, 具有97.8%的近单位光致发光量子效率. 有趣的是,(C16H28N)2SbCl5在高能辐照(300 nm)时在477 nm处显示出一个额外的发射峰, 这是由自旋-轨道耦合的二重态转变为两个独立的自束缚激子形成的. 变温拉曼光谱显示了多声子耦合的特征, 这证明(C16H28N)2SbCl5中存在强烈的非谐性电子-声子相互作用. 变温发射光谱和密度泛函理论计算表明, 所观察到的双峰发射源于[SbCl5]2−单元中的单重态和三重态自束缚激子. 结合(C16H28N)2SbCl5的高效发光和优异的稳定性, 我们还制备了超高显色指数为96.6的稳定白光发光二极管.
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Acknowledgements
This work was financially supported by Guangxi National Science Foundation project (2020GXNSFDA238004) and the Bagui Scholar Project of Guangxi Province.
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Author contributions Peng H, Wang J, and Zou B designed and carried out the experiments. Peng H and Tian Y performed the material preparation and analyzed the data. Yu Z and Ke B measured the temperature-dependent emission spectra. Wang X performed the theoretical calculation. Zhao Y and Dong T helped to fabricate the LED device. All authors participated in discussing the data and writing the manuscript
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Hui Peng received his MS degree from Zhengzhou University, Zhengzhou, China, and currently he is studying for his PhD degree at Beijing Institute of Technology, China. His research focuses on crystal growth, crystal structure analysis, and luminescent properties of the low-dimensional metal halide materials.
Jianping Wang is a professor of chemistry at the Institute of Chemistry, Chinese Academy of Sciences. His main research interests include ultrafast visible-infrared spectroscopy and ultrafast multidimensional spectroscopy and their applications in chemistry, physics, biophysics, and material sciences. He currently serves as a member of the Editorial Advisory Board of Journal of Physical Chemistry.
Bingsuo Zou received his BS degree from Jilin University in 1985 and obtained his PhD degree from Jilin University in 1991. He joined Guangxi University, Guangxi, China, in 2019, as a professor. His research focuses on optoelectronic materials, nanophotonics, and optics of magnetic semiconductors.
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Peng, H., Tian, Y., Yu, Z. et al. (C16H28N)2SbCl5: A new lead-free zero-dimensional metal-halide hybrid with bright orange emission. Sci. China Mater. 65, 1594–1600 (2022). https://doi.org/10.1007/s40843-021-1937-y
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DOI: https://doi.org/10.1007/s40843-021-1937-y