Synthesis and characterization of a strong-fluorescent Eu-containing hydrotalcite-like compound

Abstract

A novel strong-fluorescent Eu-containing hydrotalcite-like compound (Eu-HTlc) was synthesized using the coprecipitation method, in which aluminum(III) was partially substituted by Europium (III) in the hydrotalcite-like layers, and thenoyltrifluoroacetone, 1,10-phenanthroline were dispersed into the anions in the interlayer region. The sample was characterized by XRD, XPS, FT-IR, ICP, TG-DSC, TEM and fluorescence spectra, and its composition and structure were determined. The results indicated that the sample exhibited a characteristic red light (614 nm). The fluorescent lifetime and fluorescence quantum yield of Eu-HTlc were measured to be respectively 893 s and 66.44%, higher than those of Eu(III)-thenoyltrifluoroacetone-1,10-phenanthroline complex [Eu(TTA) 3 phen]. The result of TG-DSC measurement showed the enhanced thermal stability of Eu-HTlc compared with that of MgAl-LDHs and Eu(TTA) 3 phen. With excellent photoluminescent property and thermal stability, low contents of rare earth ions and ligands, the Eu-HTlc may become one of the novel fluorescent materials with potential applications.hydrotalcite-like compound, Europium, fluorescence, intercalation, supramolecule

Photoluminescent CdSe@CdS/2D as potential biocompatible materials

“…7, HTas-NR and HTd-NR exhibit PL decay spectra intermediates between those of HTas and CdSe@CdS, thus con-rming the presence of two different environments in the hybrid nanomaterials. An analogous behavior was observed when uorescent molecules like chromophores [21][22][23] or lanthanide-based complexes 20,24 were impregnated or intercalated between the hydrotalcite layers.…”

“…20 So far, only uorescent molecules like chromophores, dyes, lanthanide-based complexes, or quantum nanocrystals were impregnated or intercalated between the hydrotalcite layers. [21][22][23][24] Nevertheless, the chromophore or QD guest species provide optical functions such as color, uorescence, and nonlinear (dyes) or a mixture of linear and nonlinear (QD) optical properties. [25][26][27][28] Unlike spherical nanoparticles, elongated and rod-shaped direct-band semiconductor nanocrystals, such as CdS, CdSe, or core-shell CdSe@CdS nanorods, possess a high photoluminescence quantum efficiency, 29 suppressed Auger recombination, 30 stimulated emission, 31 fast carrier relaxation, 32 and increased Stokes shi in photoluminescence.…”

Transparent red ‐emitting silicone resin for color conversion and encapsulation of NUV light‐emitting diodes

“…When excited at 392 nm, all samples exhibit fluorescence emission peaks located at 595 nm, 613 nm, and 653 nm, revealing the well-known bands of europium red luminescence based on 5 D 0 → 7 F 1 , 5 D 0 → 7 F 2 , and 5 D 0 → 7 F 3 , respectively, similar to the case of the KH-550-Eu(TTA) 3 Phen-HTlc powder. 5 The PLE spectra of the EFHSNs were monitored at around 390 nm and closely matched the emission of an InGaN near-UV LED chip. It can be seen that the sample exhibits bright red color when under 365 nm UV illumination.…”

“…Secondly, the Eu-HTlc was prepared according to our previous work. 5 In addition, surface modification was carried out using silane coupling agent (3-aminopropyltriethoxysilane, KH-550) to improve the dispersion of Eu-HTlc in SI. Thirdly, exfoliated KH550-Eu-HTlc was prepared using just SI as the processing solvent through ultrasound.…”

“…However, they have so far been excluded from practical applications as LED devices due to their poor photo and thermal stability, and mechanical properties. In our previous work, 5 we incorporated Eu(III)-thenoyltrifluoroacetone-1,10-phenanthroline complex [Eu(TTA) 3 phen] into hydrotalcite-like compounds (HTlc) and synthesized red light-emitting Eu-containing hydrotalcite-like compound (Eu-HTlc), in which aluminum (III) was partially substituted by Europium (III) in the hydrotalcite-like layers, and thenoyltrifluoroacetone, 1,10-phenanthroline were dispersed into the anions in the interlayer region. Research shows that the Eu-HTlc possesses excellent photoluminescent property and thermal stability.…”