发光
化学
价(化学)
负热膨胀
密度泛函理论
猝灭(荧光)
热的
热膨胀
光化学
化学物理
计算化学
光电子学
热力学
有机化学
荧光
材料科学
量子力学
物理
作者
Liang Chen,Xin Chen,Rui Ma,Kun Lin,Qiang Li,Jian‐Ping Lang,Chunyu Liu,Kenichi Kato,Ling Huang,Xianran Xing
摘要
Overcoming thermal quenching is an essential issue in the practical application of luminescent materials. Herein, we found that negative thermal expansion (NTE) can achieve the thermal enhancement of luminescence in molecular materials based on three metal–organic frameworks CuX-bpy (X = Cl, Br, I; bpy = 4,4′-bipyridine). All complexes exhibit NTE on the c-axis, and the strongest NTE leads to a contraction of the Cu...Cu distance in CuCl-bpy, which further intensifies the luminescence emission. This phenomenon indicates the existence of thermally enhanced charge transfer. Moreover, the origin of the distinction in charge transfer attributed to the different valence states of the copper is investigated through the combined studies of X-ray photoelectron spectroscopy, X-ray absorption near-edge structure, and density functional theory calculations. This research provides a new approach to modulating the luminescence thermal enhancement by NTE.
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