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journal article·2024-10

A 2D Metal‐Free Inorganic Covalent Framework: Synthesis, Crystal Structure, and Room‐Temperature Phosphorescence

Qiang Dong, Guigui Ye, Lei Zhang, Cailing Chen, Miaomiao Xue, Chun‐Sing Lee, Yu Han, Zhen Li, Qichun Zhang

Small· Volume 20· Issue 43
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Source abstract

Abstract

Abstract The synthesis, crystal structure and room‐temperature phosphorescence (RTP) of a 2D metal‐free inorganic covalent framework ((H 2 en) [B 5 O 8 (OH)], named as CityU‐12 , and en represents for ethylenediamine) are reported. The precise structure information of CityU‐12 has been disclosed through both single‐crystal X‐ray diffraction (SCXRD) analysis and low‐dose high‐resolution transmission electron microscopy (LD‐HRTEM) study. The SCXRD results show that CityU‐12 composes of 2D anionic B─O‐based covalent inorganic frameworks with protonated ethylenediamine locating in the pore sites of 2D B─O layers while LD‐HRTEM suggests that CityU‐12 has an interplanar distance of 0.60 nm for (00) crystal plane and 0.60 nm for (10) crystal plane. The optical studies show that CityU‐12 is an excellent nonconventional RTP material with the emission peak at 530 nm and a lifetime of 1.5 s. The quantum yield is 84.6% and the afterglow time is as long as 2.5 s. This work demonstrates that metal‐free B─O frameworks can be promising nonconventional phosphors for RTP.
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Research context

OpenAlex topics: Luminescence and Fluorescent Materials · Covalent Organic Framework Applications · Molecular Sensors and Ion Detection

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering City University of Hong Kong Tat Chee Avenue Kowloon Tong Hong Kong SAR 999077 P. R. China

Hubei Key Lab on Organic and Polymeric Opto‐Electronic Materials Department of Chemistry TaiKang Center for Life and Medical Sciences Wuhan University Wuhan 430072 P. R. China

Physical Sciences and Engineering Division Advanced Membranes and Porous Materials (AMPM) Center King Abdullah University of Science and Technology (KAUST) Thuwal Thuwal Makkah 23955‐6900 Saudi Arabia

Department of Chemistry & Center of Super‐Diamond and Advanced Films (COSDAF) City University of Hong Kong Kowloon Tong Hong Kong SAR 999077 P. R. China

Center for Electron Microscopy South China University of Technology Guangzhou 510640 P. R. China

Kong Institute of Clean Energy City University of Hong Kong Kowloon Tong Hong Kong SAR 999077 P. R. China

Funding

City University of Hong Kong · Innovation and Technology Fund · Jilin University

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