Surface Effects on Anisotropic Photoluminescence in One‐Dimensional Organic Metal Halide Hybrids
Surface Effects on Anisotropic Photoluminescence in One‐Dimensional Organic Metal Halide Hybrids
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DOI：
10.1002/sstr.202200378
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发表时间：
2022-12
期刊：
影响因子：
15.9
通讯作者：
L. McClintock;Longyun Yuan;Ziyi Song;M. Pettes;D. Yarotski;R. Karkee;David A. Strubbe;L. Tan;Azza Ben‐Akacha;Biwu Ma;Yu Shi;V. Taufour;Dong Yu
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文献类型：
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作者：
L. McClintock;Longyun Yuan;Ziyi Song;M. Pettes;D. Yarotski;R. Karkee;David A. Strubbe;L. Tan;Azza Ben‐Akacha;Biwu Ma;Yu Shi;V. Taufour;Dong Yu
一维有机金属卤化物杂化物（OMHHs）具有强各向异性的光学性质、高效的光发射和大的斯托克斯位移，有望用于新型光电探测和照明应用。然而，其独特的光学性质，特别是表面效应的影响的基本机制还不清楚。在此，1D C4N2H14PbBr4的偏振依赖的时间平均和时间分辨光致发光（TRPL）光谱，作为光激发能量的函数，进行了研究。令人惊讶的是，它被发现，平行于1D金属卤化物链偏振的光激发下的发射可以是强或弱于垂直偏振下，这取决于激发能量。激发能依赖的各向异性发射归因于快速表面复合，这得到了该材料中光吸收的第一性原理计算的支持。快速的表面复合直接确认TRPL测量，当激发极化平行于链。全面的研究提供了一个更完整的图片，更深入地了解光学各向异性的一维OMHHs。
1D organic metal halide hybrids (OMHHs) exhibit strongly anisotropic optical properties, highly efficient light emission, and large Stokes shift, holding promise for novel photodetection and lighting applications. However, the fundamental mechanisms governing their unique optical properties and in particular the impacts of surface effects are not understood. Herein, 1D C4N2H14PbBr4 by polarization‐dependent time‐averaged and time‐resolved photoluminescence (TRPL) spectroscopy, as a function of photoexcitation energy, is investigated. Surprisingly, it is found that the emission under photoexcitation polarized parallel to the 1D metal halide chains can be either stronger or weaker than that under perpendicular polarization, depending on the excitation energy. The excitation‐energy‐dependent anisotropic emission is attributed to fast surface recombination, supported by first‐principles calculations of optical absorption in this material. The fast surface recombination is directly confirmed by TRPL measurements, when the excitation is polarized parallel to the chains. The comprehensive studies provide a more complete picture for a deeper understanding of the optical anisotropy in 1D OMHHs.