High-Performance Blue-Excitable Yellow Phosphor Obtained from an Activated Solvochromic Bismuth-Fluorophore Metal–Organic Framework

We report the synthesis, structure, and photoluminescence properties of a new bismuth based luminescent metal–organic framework (LMOF). The framework is comprised of a 9-coordinated Bi3+ building unit and 4′, 4‴, 4⁗′, 4⁗‴-(ethene-1,1,2,2-tetrayl)­tetrakis­([1,1′-biphenyl]-4-carboxylic acid) (H4tcbpe...

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Bibliographic Details
Published in:Crystal growth & design 2016-08, Vol.16 (8), p.4178-4182
Main Authors: Deibert, Benjamin J, Velasco, Ever, Liu, Wei, Teat, Simon J, Lustig, William P, Li, Jing
Format: Article
Language:English
Subjects:
bismuth
chromophore
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
luminescent MOF
MATERIALS SCIENCE
phosphor
White LED
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Summary:We report the synthesis, structure, and photoluminescence properties of a new bismuth based luminescent metal–organic framework (LMOF). The framework is comprised of a 9-coordinated Bi3+ building unit and 4′, 4‴, 4⁗′, 4⁗‴-(ethene-1,1,2,2-tetrayl)­tetrakis­([1,1′-biphenyl]-4-carboxylic acid) (H4tcbpe) organic linker, which has strong yellow aggregation induced emission (AIE). The structure can be viewed as two interpenetrated 4,4-anionic nets that are stabilized by K+ ions forming one-dimensional helical inorganic chains by connecting bismuth nodes through shared oxygen bonds. The as-made LMOF has a bluish emission centered at 459 nm with an internal quantum yield of 57% when excited at 360 nm. The emission properties of the LMOF were found to be highly solvochromic with respect to DMF. Upon partial solvent removal, the framework undergoes significant red-shifting to a greenish emission centered at 500 nm. Complete removal of DMF results in additional red-shifting fluorescence coupled with structural changes. The resulting material has strong blue-excitable (455 nm) yellow emission centered at 553 nm, with a quantum yield of 74%, which is maintained after heating in air for 5 days at 90 °C. This is the second highest quantum yield value for blue-excited yellow emission among all reported LMOFs.
ISSN:1528-7483
1528-7505
DOI:10.1021/acs.cgd.6b00622