Energy transfer from organics to rare-earth complexes

Abstract

Energy transfer from several semiconducting organic molecules and polymers to rareearth complexes in the form of spin-cast films is reported. Energy transfer is observed in poly(N-vinylcarbazole) (PVK) films doped with various europium and samarium complexes. Polystyrene films containing the hole-transporting organic molecule 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) and the electron-transporting molecule N,N′-bis(3-methylphenyl)-N,N-diphenylbenzidine also show energy transfer to the europium complexes, but not to the samarium ones. We show that energy transfer from PBD to the europium complexes is more efficient than from PVK. These films are semiconducting and easy to process, so they are candidates for monochromatic light-emitting diodes.

Synthesis, spectral characterization, crystal structures of lanthanide(III) pyrrolidine dithiocarbamate complexes and their catalytic activity

“…Lanthanide complexes have been of considerable interest because of their potential applications in fluorescent labeling reagents, imaging agents, emitter materials in organic light emitting diodes, luminescent probes, and sensory materials [1][2][3][4][5][6][7]. During attempts to prepare these complexes for various applications, organic ligands having oxygen and/or nitrogen donors have been utilized in the sensitization of lanthanide ions, in particular, aromatic amines, carboxylic acids, and β-diketones provide efficient energy transfer to lanthanide ions [8][9][10].…”

Light-Emitting Polymer Nanocomposites

“…Analysis of the UV-Vis spectra (Figure 8) suggests that the excitation wavelength for PA is 265 nm and ASA is 275 nm hence both nanocomposites exhibited the characteristic Tb 3+ emission peaks. Sharp emission spectra (FWHM < 5 nm) are generally preferred than broad emission spectra (FWHM = 50-200 nm) which organic dyes typically produce for photonic devices [25]. Sharp or narrow emission peaks are preferred as a result of improving color saturation where saturation is the perceived intensity relative to its own brightness [26].…”

The Influence of Synthesis Parameters on Particle Size and Photoluminescence Characteristics of Ligand Capped Tb3+:LaF3

“…Excitation spectra of Tb 3+ and ASA at the 540 nm emission wavelength were measured and are displayed in Figure 4. Direct excitation of Tb 3+ (350 nm) and ligand excitation (276 nm) were evaluated for each solvent as is shown in Figure 5(a,b) Organic dyes utilized in photonic devices produce broad emission spectra (FWHM = 50-200 nm) where narrow emission spectra (FWHM < 5 nm) are generally preferred [30] for improving color saturation [31] in various light-emission applications such as displays and fashion. The photoluminescence of the polymer nanocomposites synthesized in water and in methanol was measured by normalizing the spectra at 543 nm and applying Lorentzian fits.…”