材料科学
发光
咔唑
金属有机骨架
分子
配体(生物化学)
激发态
热稳定性
溶剂
纳米技术
磷光
光化学
光电子学
化学工程
荧光
物理化学
有机化学
化学
生物化学
受体
物理
吸附
核物理学
工程类
量子力学
作者
Yuchen Hu,Rebecca Shu Hui Khoo,Jingzhi Lu,Xu Zhang,Jian Zhang
标识
DOI:10.1021/acsami.2c09497
摘要
Rare-earth metal-organic frameworks (RE-MOFs) are an attractive platform to construct luminescent materials for practical applications in lighting, optoelectronics, and sensing. By adjusting the metal composition in mixed RE-MOFs, one can not only realize tunable emission but also construct ratiometric luminescent sensors. As such, it is highly desirable to prepare robust RE-MOFs that display efficient, multifunctional sensing capability. In this work, we designed and synthesized a series of RE-MOFs that exhibit both excellent thermal and chemical stability due to the incorporation of a bulky tert-butyl group on a new carbazole-based ligand. By rationally tuning the molar ratio of Eu3+/Tb3+/Y3+, a white-light-emitting MOF was developed as an excellent thermal sensor that exhibits a temperature-induced ratiometric luminescence response between 278 and 378 K. After removing the coordinated solvent molecules via thermal treatment, the desolvated MOF materials exhibit excellent turn-on or color change sensitivity to recognize dimethylformamide (DMF) molecules. Such high sensitivity is attributed to the DMF coordination that induces the framework structure change and shifts the ligand's excited-state energy level to facilitate the ligand-to-metal energy transfer process. Taking together, NPF-700-RE represents a new class of robust, tunable luminescent materials that have great potential in white-light emission and thermal- and DMF-sensing applications.
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