Wang H.,Ministry of Education Laboratory of Bioinorganic and Synthetic Chemistry |
He P.,Ministry of Education Laboratory of Bioinorganic and Synthetic Chemistry |
Liu S.,Ministry of Education Laboratory of Bioinorganic and Synthetic Chemistry |
Liu S.,Zhanjiang Normal University |
And 2 more authors.
Inorganic Chemistry Communications | Year: 2010
Two new multinuclear europium(III) complexes, [Eu(AFTFBD) 3] 2(1,4-bmb) and [Eu(AFTFBD) 3] 3(tmb) were designed and synthesized, where HAFTFBD was 2-acetylfluorene-4,4,4-trifluorobutane-1,3-dione, 1,4-bmb was 1,4-bis[2-(2′-pyridyl)benzimidazolyl]benzene and tmb was 1,3,5-tris[2-(2′-pyridyl)benzimidazolyl]benzene. The complexes were characterized by IR, UV-visible, photoluminescence (PL) spectroscopy and thermogravimetric analysis (TGA). The complexes emit the characteristic red luminescence of Eu 3+ ion due to the 5D 0- 7F J (J = 0-4) transitions under 395 nm-light excitation. Bright red light-emitting diodes were fabricated by coating the selected complex (Eu(AFTFBD) 3) 3(tmb) onto ∼395 nm-emitting InGaN chips, and the LEDs show appropriate CIE chromaticity coordinates in red area. All these results suggest that the Eu(III) complexes are promising candidates as red component for application in fabrication of near UV-based white light-emitting diodes. Crown Copyright © 2009. Source