Electronic and vibrational properties of a MOF-5 metal-organic framework: ZnO quantum dot behaviour.
UV-Vis DRS and photoluminescence (PL) spectroscopy, combined with excitation selective Raman spectroscopy, allow us to understand the main optical and vibrational properties of a metal-organic MOF-5 framework. A O(2-)Zn(2+)[rightward arrow] O(-)Zn(+) ligand to metal charge transfer transition (LMCT) at 350 nm, testifies that the Zn(4)O(13) cluster behaves as a ZnO quantum dot (QD). The organic part acts as a photon antenna able to efficiently transfer the energy to the inorganic ZnO-like QD part, where an intense emission at 525 nm occurs.
Dipartimento di Chimica IFM and NIS centre of excellence, Via P. Giuria 7, I-10125, Torino, Italy. silvia.bordiga@unito.it.
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Bordiga
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Lamberti
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Ricchiardi
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Regli
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Bonino
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Damin
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Lillerud
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Bjorgen
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Zecchina