Development of ultraviolet LED devices containing europium (III) complexes in fluorescence layer

Enhancement of the Luminescence Efficiency of Europium(III) Tris(β-diketonato) Complex in Organic Media by Quaternary Ammonium Salts with Anionic Ligands

“…The solid substance was dried at 80 C for 1 day, and was recrystallized from n-hexane. 1 Tris(1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl-4,6-octadionato)-europium(III) was obtained from Azmax. Tri-n-octylphosphine oxide and 1,10-phenanthroline were obtained from Dojindo and Aldrich, respectively.…”

“…Europium(III) complexes, especially, with β-diketones have been promising for red luminescent material in white LED's 1,2 and electroluminescence. [3][4][5][6][7] It has been known that the luminescence efficiency of tris(β-diketonato)europium(III) complexes is increased by the addition of second ligands (X).…”

Structural characterization of impurified zinc oxide thin films

“…There are numerous studies concerning the doping effect (nature and concentration) of the rare earths (RE) on the crystalline structure of certain materials [3,4,5], including ZnO [6,7,8]; using RE as dopants has an important drawback due to its limited solubility in various hosts [9,10,11,12]. Europium based compounds are of great interest due to its potential applications in spintronics [13,14,15,16,17] or for light emitting diodes (LEDs) [18,19]. For LED applications, ZnO host enables full color (from blue to red) via energy transfer to longer wavelength emitters [20]; in particular, trivalent europium doped ZnO (ZnO:Eu 3+ ) is suitable for optoelectronic applications involving red emission (the 5 D 0 → 7 F J (J = 0, 1, 2) transitions) while ZnO:Eu 2+ can be used for blue emission ( 4 f 5 6 d 1 (T 2g ) → 4 f 7 ( 8 S 7/2 ) transition) [20,12,21,22].…”

Color-tunable and white-light emitting lanthanide complexes based on (CexEuyTb1−x−y)2(BDC)3(H2O)4

“…Currently, the most commonly employed white-light emitting fluorescent materials were the inorganic salt and/or oxide doped with rare earth or transition metal ions [4][5][6][7], while whitelight emission from organic molecules have also been reported [8][9][10][11]. Besides these materials, lanthanide complexes, composed of lanthanide ions and organic ligands by coordination bonds or hydrogen-bonds, and -interactions as one kind of coordination polymers [12], have been applied in various fields such as displays, illumination, biomedicine, agriculture and military [13][14][15] due to their features including the high quantum efficiency and brightness, good color purity, and long fluorescence lifetime.…”