A luminescent Eu(III) complex based on 2-(4 ', 4 ', 4 '-trifluoro-1 ', 3 '-dioxobutyl)-dibenzothiophene for light-emitting diodes

摘要

Complex Eu(dbt)(3)(phen) (Hdbt=2-(4',4',4'-trifluoro-1',3'-dioxobutyl)-dibenzothiophene,phen=1,10 -phenanthroline) was synthesized. The complex emits red luminescence, characteristic of the D-5(0) -> F-7(J) (J = 0-4) emission bands of Eu3+ under near ultraviolet. A red conversion light-emitting diode (LED) device was fabricated by coating complex onto InGaN-based-LED chip that emits 395 nm ultraviolet light. When the mass ratio of the red phosphor to the silicone is 1:25, the LED device's CIE chromaticity coordinates are x = 0.5835, y = 0.2857,and the luminescence efficiency is 1.29 lm/w. All the results show that this europium complex may act as a red component in fabrication of white LEDs with high color-rendering index. (C) 2009 Elsevier B.V. All rights reserved.