A highly-efficient blue-light excitable red phosphor: intramolecular π-stacking interactions in one dinuclear europium(iii) complex. Issue 7 (17th December 2015)

• Record Type: Journal Article
• Authors: Wang, Zhengliang; Yang, Hui; He, Pei; He, Yonghui; Zhao, Jishou; Tang, Huaijun
• Is Part Of: Dalton transactions. Volume 45:Issue 7(2016)
• Page Start: 2839
• Page End: 2844
• Publication Date: 2015-12-17
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c5dt04407c
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : The europium(iii ) complex [Eu2 (2, 7-BTFDBC)(DBM)4 (Phen)2 ] with multiple T-shaped and parallel-displaced π-stacking interactions exhibits intense red emission under blue light excitation with high colour purity. Abstract : A series of ternary dinuclear europium(iii ) complexes [Eu2 (2, 7-BTFDBC)3− n (DBM)2 n (Phen)2 ] ( n = 0, 1, or 2) were synthesized by using 2, 7-bis(4′4′4′-trifluoro-1, 3-dioxobutyl)-(9-ethyl-9 H -carbazole) (2, 7-BTFDBC), dibenzoylmethane (DBM), 1, 10-phenanthroline (Phen) and europium(iii ) ions. All these complexes display a broad excitation band in the blue region and high intensity emission with high colour purity. The intensity of emission significantly increases with the increase of DBM in [Eu2 (2, 7-BTFDBC)3− n (DBM)2 n (Phen)2 ] ( n = 0, 1, or 2). The theoretical predictions of the molecular geometry and electronic absorption spectrum of [Eu2 (2, 7-BTFDBC)(DBM)4 (Phen)2 ] confirm that the pendant phenyl domains engage in multiple T-shaped and parallel-displaced π-stacking interactions with the coordination sphere of two europium(iii ) centers. Using [Eu2 (2, 7-BTFDBC)(DBM)4 (Phen)2 ] as a red phosphor, a single red LED has been obtained with a ∼460 nm-emitting GaN chip.