Red emissive ternary europium complexes: synthesis, optical, and luminescence characteristics

Abstract

Solid ternary europium complexes consisting of fluorinated β‐diketone (thenoyltrifluoroacetone, TTFA) and heteroaromatic bidentate auxiliary ligands were synthesized. The luminescence features of the complexes were estimated using various spectral measurements and clearly proved that the Eu3+ ion is efficiently sensitized by ligands by an antenna effect. Photoluminescence excitation spectra have shown that Eu(III) complexes are excited effectively in the ultraviolet (UV) region and the corresponding emission spectra consist of characteristic peaks attributed to the 5D0→7FJ transitions of the europium ion with the strongest emission peak at 611 nm (5D0→7F2). From photoluminescence (PL) data, decay time, Judd–Ofelt parameters, transition rates, and quantum efficiency of the complexes were also determined. The Commission Internationale de l'éclairage (CIE) colour coordinates indicated the bright red emission of ternary europium complexes. Correlated colour temperature values indicated the utilization of these complexes in display devices. Judd–Ofelt and photophysical parameters were also estimated theoretically using LUMPAC software. Various frontier molecular orbitals and their respective energy were determined. These red emissive europium complexes could be utilized for fabricating solid‐state lighting systems.

Fluorinated β‐diketone‐based Sm(III) complexes: spectroscopic and optoelectronic characteristics

“…[ 35 ] The Sm(III) complexes were synthesized in a one‐step reaction as shown in Figure 1. [ 36–39 ] CHN analysis confirmed the elemental composition of the four complexes Sm1–Sm4. Here, 6.48 mmol of TFNB in 5 ml EtOH was taken in a 50 ml beaker and 6.48 mmol of 25% NH 4 OH was added into it.…”

Mesoporous silica nanoparticles with dual-targeting agricultural sources for enhanced cancer treatment via tritherapy

“…† Used PL spectroscopy to demonstrate the imaging capabilities of rMSN-EuGd-Bi. It was excited by a light source with a wavelength of 395 nm, generating radiative absorption peaks at 590 nm and 615 nm, centered on the red emission peaks of Eu 3+ at 5 D 0 / 7 F 1 (590 nm) and 5 D 0 / 7 F 2 (615 nm), receive excitation light, 26 as shown in Fig. 2a.…”

Optical, electrochemical and photophysical analyses of heteroleptic luminescent Ln(iii) complexes for lighting applications

“…[14][15][16] Existence of solvent units in lanthanide complexes are greatly unsuitable on account of highly energized stretching vibrators of hydroxyl and amino modes which leads to luminescence quenching. 17,18 It can prominently restrict the practicability of ternary complexes as luminescent material. The high energetic oscillators in chromophoric moieties are also reasonable to quench the luminescence phenomenon in lanthanide ions.…”