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Blue highly fluorescent boron difluoride complexes based on phthalazine–pyridine†
Thi Minh Ha Vuong,Jennifer Weimmerskirch-Aubatin,Jean-François Lohier,Nathalie Bar,Sophie Boudin,Christophe Labbé,Fabrice Gourbilleau,Hien Nguyen,Tung Thanh Dang,Didier Villemin
New Journal of Chemistry Pub Date : 04/27/2016 00:00:00 , DOI:10.1039/C6NJ00726K
Abstract

Three new boron difluoride complexes based on phthalazine–pyridine, denoted (6), (7) and (8), have been synthesized and their photophysical and electrochemical properties have been studied. Solutions of these new BF2-complexes exhibit an intense blue fluorescence under UV light at low concentrations. Fluorescence quantum yields (QYs) have been determined by photoluminescence (PL) spectroscopy and decay times (τ) by semi-empirical methods. QYs of (6), (7) and (8) vary from 25% to 79%. HOMO and LUMO energy levels have been estimated by cyclic voltammetry and PL spectroscopy. The HOMO and LUMO energy levels, at ∼−5.3 eV and ∼−2.3 eV, respectively, make these new complexes interesting candidates as blue emitters in OLED applications.

Graphical abstract: Blue highly fluorescent boron difluoride complexes based on phthalazine–pyridine
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