激子
化学
光致发光
斯托克斯位移
激发态
发射光谱
声子
发光
拉曼光谱
分子物理学
超快激光光谱学
量子产额
量子点
飞秒
吸收光谱法
光谱学
原子物理学
谱线
凝聚态物理
荧光
材料科学
光电子学
物理
激光器
量子力学
天文
光学
作者
Debendra Prasad Panda,Diptikanta Swain,Mohit Chowdhry,Samita Mishra,Garima Bhutani,Arijit K. De,Umesh V. Waghmare,A. Sundaresan
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2022-10-15
卷期号:61 (43): 17026-17036
被引量:10
标识
DOI:10.1021/acs.inorgchem.2c01581
摘要
We report a large Stokes shift and broad emission band in a Mn-based organic-inorganic hybrid halide, (Guanidinium)6Mn3Br12 [GuMBr], consisting of trimeric units of distorted MnBr6 octahedra representing a zero-dimensional compound with a liquid like crystalline lattice. Analysis of the photoluminescence (PL) line width and Raman spectra reveals the effects of electron-phonon coupling, suggestive of the formation of Frenkel-like bound excitons. These bound excitons, regarded as the self-trapped excitons (STEs), account for the large Stokes shift and broad emission band. The excited-state dynamics was studied using femtosecond transient absorption spectroscopy, which confirms the STE emission. Further, this compound is highly emissive with a PL quantum yield of ∼50%. With chloride ion incorporation, we observe enhancement of the emissive properties and attribute it to the effects of intrinsic quantum confinement. Localized electronic states in flat bands lining the gap and their strong coupling with phonons are confirmed with first-principles calculations.
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