Intercalation of Diverse Organic Guests into Layered Europium Hydroxides – Structural Tuning and Photoluminescence Behavior

Abstract

Organic anions of two benzenepolycarboxylic acids [1,3,5benzenetricarboxylic acid (BTA) and 2,2Ј-biphenyldicarboxylic acid (BDA)], two pyridinecarboxylic acids [quinolinic acid (QA) and 2,5-pyridinedicarboxylic acid (PDA)], and two amino acids [phenylalanine (Phe) and tyrosine (Tyr)] were intercalated into the galleries of NO 3 --type layered europium hydroxide (NO 3 -LEuH). All the prepared products displayed XRD patterns with series of diffractions due to layered materials. The composite structures and the arrangement of the guests in the galleries were investigated in detail. The structure of the organic guests (such as the number and position of carboxyl groups) affects the arrangement in the interlayer. SEM observations showed that the NO 3 -LEuH precursor and its intercalates crystallize in a columnar or layered stacking[a] Beijing Key

Delaminated layered rare-earth hydroxide composites with ortho-coumaric acid: color-tunable luminescence and blue emission due to energy transfer

“…With regard to LRH/organic composites, most of the investigations focused on Eu-involving LRHs, for example our recent work for LEuH, LYH:Eu and LGdH:Eu, in which enhancement or quenching for Eu 3+ luminescence by the introduced organics was found. [29][30][31][32] Studies on layered terbium hydroxide (LTbH) composites with organic compounds are relatively rare, 33,34 and they mainly involve the luminescence of the layer Tb 3+ rather than interlayer organics.…”

Enhanced photoluminescence of LEuH nanosheets: 2D photonic crystals self-assembled by core–shell SiO2@LEuH spheres

“…Second, as the emission band lies out of the range of the photonic band- gap, (1) the suppression of the emission is ascribed to the higher site symmetry of Eu 3+ ions compared with that of the precursor 17 and (2) the enhancement of the PL properties is ascribed to the higher effective refractive indices that minimize the surface scattering of both the excitation and emission lights aer close packing of the core-shell structures. 8 In this experiment, we synthesized a periodic hexagonal close-packed single layer parallel to the laminate, and it was considered that a photonic band gap would be present in the direction parallel to the laminate rather than in the direction perpendicular to the laminate. Fig.…”

“…7 In order to improve the PL performance of LRHs, various organic anions have been intercalated into the interlayers of LRHs based on the sensitization enhancement effect. [8][9][10] Other studies achieved the PL enhancement by converting LRHs into rareearth oxides 11 via calcination or a topological reaction. 12 Byeon et al prepared multi-colored LRH lms via alternately stacking the LEuHs and LTbH nanosheets.…”

Rare earth and zinc layered hydroxide salts intercalated with the 2-aminobenzoate anion as organic luminescent sensitizer

“…5A-c). The benzene ring and carboxylate groups may enhance the luminescence of Eu 3+ , but the ÀNH 2 may quench the luminescence, possibly as a result of significant nonradioactive relaxation channels as observed by Gu et al [31]. However, although the 2-aminobenzoate anion enhances the luminescence of Tb 3+ , this anion decreased the emission intensity of Eu 3+ .…”