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Achieving a blue-excitable yellow-emitting Ca-LMOF phosphor via water induced phase transformation

Journal Article · · Chemical Science
DOI:https://doi.org/10.1039/d1sc05594a· OSTI ID:1859723
 [1];  [2];  [2];  [3];  [4];  [5];  [3];  [6];  [2];  [3]
  1. Rutgers Univ., Piscataway, NJ (United States); Chinese Academy of Sciences (CAS), Fuzhou (China). Fujian Institute of Research on the Structure of Matter
  2. Chinese Academy of Sciences (CAS), Fuzhou (China). Fujian Institute of Research on the Structure of Matter
  3. Rutgers Univ., Piscataway, NJ (United States)
  4. Synfuels China Technology Co. Ltd., Beijing (China)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  6. Harbin Institute of Technology (China)
Luminescent metal-organic frameworks (LMOFs) with diverse structural features and promising fluorescence-based applications have attracted wide attention in the past two decades. In this work, a LMOF with the formula [Ca4(tcbpe-F)2(H2O)3] (1, LMOF-411) has been constructed from calcium (Ca) and 1,1,2,2-tetrakis(4-(4-carboxyphenyl)phenyl)ethene (H4tcbpe-F). Compound 1 features a three-dimensional framework with a 10-nodal net topology. Due to the relatively high hydration energy of Ca2+, compound 1 readily transforms into a new phase formulated as [Ca(H2tcbpe-F)(H2O)2] (1') upon exposure to water. Combining experimental characterization and theoretical calculations, we elucidated the mechanism of H2O-induced phase transition from 1 to 1'. Notably, the water induced phase transformation can be detected visibly from the change in luminescence, which originates from the fluorescent linker. Compound 1 emits green light (λem = 490 nm) under UV excitation, while compound 1' emits bright yellow light (λem = 550 nm) under blue excitation (450 nm). Compound 1' represents the first Ca based LMOF yellow phosphor and its luminescence quantum yield reaches 68%. It can be coated directly onto a commercial blue light-emitting-diode (LED) chip to fabricate a white LED (WLED).
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1859723
Journal Information:
Chemical Science, Journal Name: Chemical Science Journal Issue: 5 Vol. 13; ISSN 2041-6520
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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