New multinuclear europium(III) complexes as phosphors applied in fabrication of near UV-based light-emitting diodes

Zinc(ii) complexes containing bis-benzimidazole derivatives as a new class of apoptosis inducers that trigger DNA damage-mediated p53 phosphorylation in cancer cells

“…The ligand was synthesized according to a previous method. 31 Briefly, a mixture of bromobenzene (1.75 g, 11 mmol), 2,6-bis-Fig. 7 Regulation of phosphorylated p53, total p53 and phosphorylated histone H2A.X expression levels by complex 2 in MCF-7 cells.…”

Influence of Synthesis Parameters on Luminescence of Thenoyltrifluoroacetone Europium Powders

“…The trivalent europium ion (Eu 3+ ) specifically has a narrow emission band that provides highly pure red color emission and also has a considerably long lifetime which makes it very useful in applications in display devices [2] [3] [4] as well as in medical diagnosis [5] [6] [7] [8].…”

Application of a novel cationic iridium(iii) complex as a red phosphor in warm white light-emitting diodes

“…Good red phosphors are very essential as they play a key role in the second approach, and to date, numerous red phosphors (such as Ce 3+ , Eu 2+ or Mn 4+ activated inorganic oxysalts; silicon nitrides; silicon oxynitrides; and thiosilicates; 15,[18][19][20][21][22][23] quantum dots; 16,[24][25][26] Mn 4+ activated fluorides; 7,17,27 and organic europium(III) complexes [28][29][30] ) have been developed for LEDs; however, perfectly satisfactory red phosphors for practical applications in WLEDs based on YAG:Ce and blue GaN chips are still very scarce due to various drawbacks and problems. These drawbacks and problems include excessively strong thermal quenching even at low temperatures (such as CaZnOS:Eu 2+ and Sr 2 CeO 4 :Eu 3+ ); 19,31 deep red and near-IR emission obtaining the low eye sensitivity (such as Ca 14 Al 10 Zn 6 O 35 :Mn 4+ ); 18 the excitation/absorption bands of red phosphors showing poor overlap with blue light emitting from GaN chips and therefore making them almost useless (such as organic europium(III) complexes); [28][29][30] and potential degradation under high temperature and humidity conditions (such as M 2 SiO 4 :Eu 2+ (M = Ca 2+ , Sr 2+ , Ba 2+ ), (Sr,Ca) 3 Si 1Àx -Al x O 4+x F 1Àx :Ce 3+ and K 2 SiF 6 :Mn 4+ ). 32 At present, the most active and promising red phosphors systems, such as semiconductor quantum dots (QDs) 16,[24][25][26] and Mn 4+ doped fluorides, 7,17,27 are also beset with some drawbacks.…”

“…To date, most of the phosphors used in LEDs are inorganic down-conversion luminescent materials, which is mainly due to their high stability and energy conversion efficiency. 34 At the same time, many organic down-conversion luminescent materials, such as organic rare earth complexes, [28][29][30] organic boron complexes, 35 organic iridium(III) complexes, [36][37][38] luminescent polymers 39,40 and small-molecule fluorescent dyes [40][41][42] have also been used as phosphors in LEDs and some other advantages, such as broad emission spectra, good color tenability and hydrophobic nature without susceptibility to humidity, have been exhibited. Organic cationic iridium(III) complex luminescent materials have been rapidly developed in the last decade and have been widely applied in light-emitting electrochemical cells (LECs) 43,44 and organic light-emitting diodes (OLEDs) [45][46][47] due to their high efficiency of 100% theoretical quantum efficiency, hydrophobic nature, broad emission, excellent color tunability via various ligands, and high thermal and photic stability.…”