Synthesis, Photoluminescence Behavior of Green Light Emitting Tb(III) Complexes and Mechanistic Investigation of Energy Transfer Process

A series of five new terbium(III) ion complexes with 4,4-difluoro-1-phenylbutane-1,3-dione (HDPBD) and anciliary ligands was synthesized. The composition and properties of complexes were analyzed by elemental analysis, IR, NMR, powder X-ray diffaraction, TG-DTG and photoluminescence spectroscopy. These complexes exhibited ligand sensitized green emission at 546 nm associated with ⁵D₄ → ⁷F₅ transitions of terbium ion in the emission spectra. The photoluminescence study manifested that the organic ligands act as antenna and facilitate the absorbed energy to emitting levels of Tb(III) ion efficiently. The enhanced luminescence intensity and decay time of ternary C2-C5 complexes observed due to synergistic effect of anciliary ligands. The CIE color coordinates of complexes came under the green region of chromaticity diagram. The mechanistic investigation of intramolecular energy transfer in the complexes was discussed in detail. These terbium(III) complexes can be thrivingly used as one of the green component in light emitting material and in display devices. Graphical Abstract Illustrate the sensitization process of the Tb ion and intramolecular energy transfer process in the Tb³⁺ complex.

Efficient visible and near-infrared photoluminescent attapulgite-based lanthanide one-dimensional nanomaterials assembled by ion-pairing interactions

Efficient photoluminescent attapulgite-based one-dimensional lanthanide hybrid nanomaterials are first fabricated by ion-pairing interactions.

Lanthanide mesoporous SBA-15 hybrids through functionalized 6-hydroxybenz[de]anthracen-7-one linkage: UV-visible light sensitisation and visible-NIR luminescence

A series of new visible and near-infrared (NIR) luminescent lanthanide-hydroxybenz[de]anthracen derivatives (Ln(HBAN)(3)(H(2)O)(2)(NO(3))(3), Ln(HBAN)(3)phen(NO(3))(3)) were synthesized (HBAN-6-hydroxybenz[de]anthracen-7-one, Ln=Eu, Yb, Nd). Further, chemically bonded lanthanide hybrids of functionalized mesoporous silica (SBA-15) are prepared using HBAN-functionalized alkoxysilane (HBAN-Si) as linker, which is named as Ln(HBAN-SBA-15)(3)(NO(3))(3), Ln(HBAN-SBA-15)(3)phen(NO(3))(3) (Ln=Eu, Yb, Nd), respectively. The physical characterization and especially the photoluminescence properties for these hybrids are performed. SAXRD and BET of them revealed that all of these hybrid materials have uniformity in the mesostructure. Worth noting here is that the excitation spectra of these hybrid materials are extended to visible light region (439-535 nm). Upon ligand-mediated excitation with the ultraviolet and visible light, the visible luminescence for europium hybrids and NIR luminescence for Yb(3+) and Nd(3+) hybrids are obtained.