Κατεύθυνση Ανόργανη Χημεία και Εφαρμογές της στη Βιομηχανία
Library of the School of Science

2020-02-25

2020

Koliopanos Filippos

ΙΩΑΝΝΗΣ ΠΑΠΑΕΥΣΤΑΘΙΟΥ, Αναπληρωτής καθηγητής, Τμήμα Χημείας, ΕΚΠΑ

Νέες Μεταλλο-Οργανικές Κατασκευές που Βασίζονται σε Οξαλαμιδικούς Υποκαταστάτες ως Υλικά για την Εκπομπή Λευκού Φωτός.

Greek

New Metal-Organic Frameworks Based on Oxalamide Ligands as Materials for White Light Emission.

In the context of this thesis, the use of a known tetratopic ligand along with the extensive study of the chemical system Y3+/ tetratopic ligand led to the formation of a new Metal-Organic Framework containing Y3+ metal centers. Based on this new MOF and utilizing the results of the chemical system’s study, nine new MOFs containing metal centers of almost all of the lanthanide series were isolated. The sum of these new MOFs was characterized with the use of various techniques, with the most important being single-crystal X-Ray crystallography and Powder X-Ray Diffraction. The results that stemmed from these techniques were used to classify these new materials to three groups of isostructural compounds while we also studied their chemical behavior and investigated their properties.
Over the last few years white light emitting MOFs have been synthesized following a strategy that contains one material with multiple emission points. This luminescence originates either from the organic ligand or the metal center or ligand to metal charge transfer and vice versa or by the combination of all the above. Being aware of the luminescence properties that distinguish lanthanide-MOFs from the rest of metal-organic frameworks our goal became the isolation of novel white light emitting materials. With that in mind, we proceeded in the synthesis of a series of new materials by utilizing the RBG (Red Green Blue) strategy. So, one compound from each group was selected and was doped in situ with Eu3+ and Tb3+ ions. The novel materials that derived from the use of this method were characterized and their luminescence properties were investigated. The results of this investigation were utilized to evaluate which materials were capable of white light emission.

Science

Metal-Organic Frameworks, Crystal Structure, Porous Materials, White Light Emission

No

0

Yes

61

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https://pergamos.lib.uoa.gr/uoa/dl/object/2898124