A luminescent Eu(III) complex based on 2-(4', 4', 4'-trifluoro-1', 3'-dioxobutyl)-dibenzothiophene for light-emitting diodes.
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 (5)D(0)-->(7)F(J) (J=0-4) emission bands of Eu(3+) under near ultraviolet. A red conversion light-emitting diode (LED) device was fabricated by coating complex onto InGaN-based-LED chip that emits 395nm 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.
Liu
Sheng-Gui
SG
School of Chemistry Science and Technology, Development Center for New Materials Engineering & Technology in Universities of Guangdong, Zhanjiang Normal University, Zhanjiang, 524048, China. lsgui@sohu.com
Gong
Meng-Lian
ML
Wang
Sheng
S
Tan
Xiu-Mei
XM
D005063:Europium / Q000737:chemistry*; D008027:Light; D049449:Luminescence; D055095:Optics and Photonics; D013876:Thiophenes / Q000737:chemistry*
D013876:Thiophenes; D005063:Europium; C016366:dibenzothiophene