Younes Abid

University of Sfax | US · Departement of physics

Clusterization-triggered emission (CTE) of nonconventional chromophores has recently attracted increased interest for its synergetic photophysical properties and promising applications, such as optical anticounterfeiting, white-light emission devices, or molecular sensing. Many studies have been conducted on pure organic clusteroluminogens (CLgens)...

The photophysical properties of a set of new synthesized iminocoumarins and their N-substituted dyes have been investigated by means of experimental spectroscopy and DFT and TDDFT theoretical calculations. These materials act as push-pull systems consisting of free iminocoumarins and N-substituted by the dicyanovinyl function, that bearing differen...

The structural and optical properties of a new Cd-based Metal-Organic-Framework are presented. The structure consists of isolated hybrid clusters formed by CdCl4O2 octahedra linked covalently to two aminocoumarin groups via ligand to metal Cd-O bonds. The optical UV-Visible absorption (OA) shows features related to Ligand to Ligand Charge Transfer...

The solid state photophysical properties of the 3,3'-paraphenyl bis[6,8-dimethoxy-2H-chromen-2-one] symmetrical biscoumarin material were investigated by optical spectroscopy techniques and by theoretical calculations. Vibrational analysis using IR absorption and Raman scattering techniques carried out together with DFT theoretical calculations hav...

The present work deals with the optical properties of hybrid organic metal halide material namely (C9H8NO)2SnCl6·2H2O. Its structure is built up from isolated [SnCl6]2- octahedral dianions surrounded by Hydroxyl quinolinium organic cations (C9H8NO)+, abbreviated as [HQ]+. Unlike the usual hybrid materials, where metal halide ions are luminescent se...

In this work we focus on the optoelectronic properties and white light emission process of a new 2D organic inorganic perovskite (C3H8N6)PbCl4. Its structure determined by X-ray diffraction it's built up from a stack of PbCl6 corner sharing octahedra layers separated by organic melamine cations (C3H8N6)2+. Under UV excitation (300 nm) this material...

Organic-inorganic hybrid (OIH) materials have emerged as high-performance class of light emitters, which can be used as phosphors for optically pumped white light-emitting diodes (WLEDs). Here, we report a new example of broadband white light (WL) emission from zero-dimensional lead chloride-based OIH material namely (TAE)2[Pb2Cl10](Cl)2 (TAE = tri...

This work deals with normal luminescence and up-conversion luminescence involving charge transfer and triplet- triplet annihilation in the free lead hybrid materials (HQ)2[ZnCl4 and HQCl, HQ is the Hydroxylquinolinate cation (HQ+ = C9H8NO+). The crystal structures were determined by X ray diffraction and the optical properties were investigated by...

Organic-inorganic Hybrid (OIH) materials have the potential of providing synergetic properties and promising novel optical properties. This work focuses on the charge transfer (CT) excitons which play a critical role in a new OIH material, with formula (C7H7N2S) [PbCl3] abbreviated as ABTPbCl3. Its crystal structure is built up from [Pb2Cl8]4- clus...

In the present paper, the synthesis, X-ray structural characterization, optical properties and electronic structures of three novel organic–inorganic hybrid compounds of the general formula [CH3SC(NH2)2]xBiAx+3, (A = I, Br, Cl, and x = 1 or 2) are reported. All of them show intense narrow excitonic peaks at the absorption spectra and narrow photolu...

The synthesis and the optical properties of a new organic–inorganic hybrid material (C6H22N4)[Pb2Br8] (abbreviated as TETAPb2Br8) is reported here. Its ladder‐like crystal structure is built up from infinite 1D chains of corner‐sharing [Pb2Br8]4− bi‐octahedra surrounded by tetra‐protonated triethylenetetramine (abbreviated as TETA4+) organic cation...

Three organic-inorganic hybrid compounds based on chlorometalate anions and 1,4-Diazoniabicyclo[2.2.2]oc-tane cations [(DABCOH 2) 2+ ] have been synthesized by slow evaporation technique at ambient temperature. Their chemical formulas are (DABCOH 2) 2 [Sb 2 Cl 10 ]·2H 2 O (1), (DABCOH 2) 2 [Sb 2 Cl 10 ]·H 2 O (2) and (DABCOH 2) 4 [Cd 2 Cl 7,83 ][Sb...

This paper reports on the optical properties of new organic metal halide material [C6N2H5]3BiCl6. The crystal structure is built up from the packing of distorted [BiCl6]³⁻ octahedra surrounded by organic cation [C6N2H5]⁺. Unlike the classical metal halide materials in which organic molecules are optically inactive, both organic and inorganic compon...

This work focus on the white light emission process occurring in a new organic-inorganic hybrid metal halide material, whith formula (C7H12N2S)2[PbBr3] abbreviated as (ABT)2[PbBr3]. Its structure consists on one-dimensional PbBr3 twin chains surrounded by 2-aminobenzothiazole (ABT) organic cations. The introduction of the optically active organic l...

We investigated by means of optical microscopy (OM) the spatiotemporal features of the thermo-induced spin transition of the [Fe(2-pytrz)2{Pd(CN)4}].3H2O (1) (2-pytrz = 4-(2-pyridyl)-1,2,4,4H-triazole) single crystals having two different shapes (triangle and rectangle). While magnetic and calorimetric measurements, performed on a polycrystalline m...

Organic-inorganic hybrid perovskites (OIHP) are developing rapidly as high-performance semiconductors for solid-state solar cells and light emitting devices. Recently, lead-halide two-dimensional (2D) OIHP were found to present bright broadband visible emission, thus highlighting their potential as single-component white-light (WL) emitters. This c...

This paper reports on the optical properties of organic – inorganic natural self assembled bimodal quantum dots (dimetylammonium) hexa-iodobismuthate [(CH3)2NH2]3[BiI6]. The crystal structure consists of isolated BiI6 octahedra, as inorganic ions, surrounded by dimethylamine cations. At room temperature, we investigate the optical properties by: UV...

The rise of lead halide perovskites as light harvesters has stunned the photovoltaic community, due to high efficiencies achieved. The hybrid metal halide perovskites, due to unique optical and electronic properties and the corresponding application in optoelectronic devices are a hot topic of academic research. Although the Pb and Sn hybrids are u...

Keywords: Organiceinorganic material FRET Photoluminescence Quasi-white light and intense emission a b s t r a c t This work deals with optical properties of a new organic inorganic material: 3, 3 0-Diaminodiphenyl-sulfone tin chloride with the formula (C 12 H 14 N 2 O 2 S)[SnCl 6 ]H 2 O abbreviated as (AMPS)[SnCl 6 ]H 2 O. Single crystals of (AMPS...

The control of the composition of mixed organic-inorganic hybrid perovskites by solid-state alloying is a very efficient tool to tune the band gap of the material, leading to enhanced optical performances. At this end, we have elaborated a series of mixed-halide two-dimensional hybrid perovskites (C6H11NH3)2[PbBr4−xIx], with 0 ≤ x ≤ 4, for which we...

In this study we report results of first-principles density functional calculations using the full-potential linearized augmented plane wave (FP-LAPW) method as implemented in the WIEN2K code. We employed the generalized gradient approximation (GGA) for the exchange-correlation energy to calculate electronic and linear optical properties of the (C9...

The L-Leucine L-leucinium picrate (LLLLP), an organic optical material was synthesized and single crystals were grown by slow evaporation technique. The optical properties were investigated by optical absorption, ellipsometry and photoluminescence spectroscopy. Photoluminescence measurements showed that this compound exhibits a green emission aroun...

Single crystals of L-asparaginium nitrate (LAsnN) were grown by slow evaporation technique. To confirm the crystalline nature of the obtained compound, samples were the subject of an XRPD. The density functional theory (DFT) computations were carried out at B3LYP/6-31G (d) level to reach the optimized geometry, the vibrational spectra and the NLO p...

The 2,5-dimethylanilinium chloride monohydrate compound is obtained by slow evaporation at room temperature. This material is characterized by DSC, X-Ray powder diffraction, Raman and impedance spectroscopy technique measured in the 2.102–5.106 Hz frequency and 292–422 K temperature ranges. The calorimetric study has revealed three endothermic peak...

In this article we focus on the optical properties of a luminescent two dimensional organic- inorganic material (thiopheneethyl ammonium lead iodide) with the formula (C4H3SC2H4NH3)2[PbI4]. This compound exhibits a self-assembled nano-layered structure, forming a multi-quantum wells (QWs) structure. X-ray diffraction patterns revealed that thin fil...

The dynamics of the thermally induced first-order structural phase transition in a high-quality single crystal of the organic-inorganic perovskite (C12H25NH3)2PbI4 was investigated by optical microscopy. The propagation of the straight phase front (habit plane) during the phase transition along the cooling and heating pathways of the thermal hyster...

Optical and structural properties of the organic-inorganic hybrid perovskite-type (C6H11NH3)2[PbI4] (abbreviated as C6PbI4) were investigated using optical absorption, photoluminescence (PL), and x-ray diffraction measurements. Room temperature, optical absorption measurements, performed on spin-coated films of C6PbI4, revealed two absorption bands...

The performance of hybrid organic perovskite (HOP) for solar energy conversion is driving a renewed interest in their light emitting properties. The recent observation of broad visible emission in layered HOP highlights their potential as white-light emitters. Improvement of the efficiency of the material requires a better understanding of its phot...

The thermal properties of the organic-inorganic hybrid material (C6H11NH3)2[PbI4] are investigated using diffuse reflectivity, spectroscopic ellipsometry, differential scanning calorimetry, Raman spectroscopy, and X-ray diffraction. The diffuse reflectivity, performed in heating mode, clearly evidences the presence of a singularity at 336 K. This i...

A new organic-inorganic material, diethylenetriammonium hexabromobismuthate (C4H16N3)BiBr6, was synthesized and characterized by X-ray diffraction, infrared absorption, Raman spectroscopy scattering and optical absorption. The crystal lattice is composed of discrete [BiBr6] anions surrounded by diethylenetriammonium cations. The title compound crys...

In this work, we investigate the optical properties of triangular gold nanoprisms synthesized following a one-pot chemical process and using triethylene glycol (TREG) and polyvinylpyrrolidone (PVP) as solvent and capping agents. The nanoprisms sustain a strong localized surface plasmon resonance (LSPR) which is exploited in surface-enhanced Raman s...

A new organic-inorganic hybrid material, 1,4-bis(3-ammoniumpropyl) piperazinium pentachloridocuprate(II) chloride tetrahydrate [(C10H28N4)CuCl5Cl⋅4H2O], has been synthesized and characterized by X-ray diffraction, UV-visible absorption, Infrared and Raman spectroscopy. The compound crystallizes in the orthorhombic system and Pnma space group with a...

Single crystals of 2,5-dimethylanilinium dihydrogen phosphate were grown by slow evaporation method at room temperature. The synthesized compound was characterized by powder X-ray diffraction analysis to confirm its crystalline nature. The optimized molecular structure, vibrational spectra and the optical properties were calculated by the density f...

In the title compound, [Ni(C3H10N2)3]2[Ni(C3H10N2)2(H2O)2]Br6·2H2O, one Ni(2+) cation, located on an inversion centre, is coordinated by four N atoms from two ligands and by two water O atoms. The other Ni(2+) cation, located in a general position, is coordinated by six N atoms from three ligands. In both cases, the Ni(2+) cation has an octa-hedral...

The crystals of the family of alkylammonuim tetrachloridocuprate (II), (C5H7N2)(2)CuCl4H2O, have been grown, structurally characterized and their vibrational as well as optical properties been studied. A preliminary single crystal X-ray diffraction structural analysis has revealed that the title compound belongs to the monoclinic system with space...

The zero dimensional organic-inorganic hybrid compound (C7H7N2S)2CuCl4 was synthesized and characterized by X-ray diffraction, infrared absorption, Raman spectroscopy scattering and optical transmission measurements. The title compound crystallizes in the monoclinic system with P21/c space group. The unit cell parameters are a=7.060 (5)Å, b=9.748 (...

Single crystals of l-leucine l-leucinium picrate were grown by slow evaporation at room temperature and were characterized by X-ray powder diffraction study to confirm the crystalline nature of the synthesized compound. The optimized molecular structure, vibrational spectra and the optical properties were calculated by the Density Functional Theory...

The present research work accounts for a combined experimental and theoretical study on crystal structure and vibrational spectra of a new organic inorganic hybrid compound (C7H8N3)2CdI4. In fact, the single crystals of bis (2-aminobenzimidazolium) tetraiodocadmate (C7H8N3)2CdI4, were obtained by slow evaporation of an aqueous solution at room temp...

In this work, we study the mixed convection cooling of electronic components (blocks) placed on horizontal parallel plates (horizontal channel with openings). The periodic geometry configuration allowed us to reduce the study area to a T form cavity or inverted T form cavity(when the blocks are placed on the upper plate of the channel). The cavity...

In this work we investigate the excitonic properties of (4-FC6H4C2H4NH3)(2)PbI4 hybrid organic/inorganic thin films. We first use a standard point-by-point photoluminescence mapping. The maps formed using the photoluminescence intensity, line width, and broadening reveal the presence of structural defects. Using a statistical treatment of the data...

A new organic–inorganic hybrid material of formula (C6H13N3)2Pb3I10, was synthesized and characterized by X-ray diffraction, infrared absorption and Raman spectroscopy scattering. The titled compound, abbreviated API PbI, crystallizes as an organic–inorganic one-dimensional (1D) structure built up from infinite PbI6 octahedra surrounded by organic...

An organic–inorganic quantum well embedded on porous anodic alumina was synthesized and studied by MEB, AFM, optical absorption and photoluminescence. The morphology determined by the MEB and the AFM, shows that the size of the pores is about 10 nm for alumina evaporated on glass substrate and about 35 nm for alumina template prepared in sulfuric a...

The new organic–inorganic hybrid compound [C10H7NH3]BiI4 has been grown by the solvent evaporation method. The one-dimensional (1D) structure for [C10H7NH3]BiI4 has been determined by the single-crystal X-ray diffraction to be orthorhombic, Pbca with a = 15.515(3) Å, b = 7.643(2) Å, c = 29.067(5) Å and Z = 8. The structure consists of corrugated la...

a b s t r a c t Single perovskite slab alkylammonium lead iodides bromides (C 9 H 19 NH 3) 2 PbI 2 Br 2 is a new member of the family of hybrid organic-inorganic perovskite compounds. It exhibits a single structural phase transition with changes in the conformation of alkylammonium chains below room temperature. Differential scan-ning calorimetry (...

The thermal properties of the perovskite slab alkylammonium lead iodide (FC6H4C2H4NH3)2[PbI4] are investigated using spectroscopic ellipsometry, differential scanning calorimetry, photoluminescence, and Raman spectroscopy. The spectroscopic ellipsometry, performed in the heating mode, clearly evidenced the presence of a singularity at 375 K. This i...

α-[C6H4(NH3)2]2Bi2I10, which is a new material containing low-dimensional iodobismuthate anions, was synthesized and through its single crystal X-ray diffraction measurements, was proven to crystallize at room temperature in the centrosymmetric space group P21/c. It consists of a p-phenylenediammonium dication and a discrete (0-D) anion built up of...

(C9H19NH3)2PbI2Br2 compound is a new crystal belonging to the large hybrid organic–inorganic perovskites compounds family. Optical properties are investigated by optical absorption UV–visible and photoluminescence (PL) techniques. Bands to band absorption peak at 2.44eV as well as an extremely strong yellow–green photoluminescence emission at 2.17e...

This paper presents the results of our calculations on the geometric parameters, vibrational spectra and hyperpolarizability of a nonlinear optical material L-histidine oxalate. Due to the lack of sufficiently precise information on geometric structure in literature, theoretical calculations were preceded by re-determination of the crystal X-ray st...

A new organic–organic salt, melaminium 2,5-dinitrophenolate monohydrate has been synthesized and characterized by X-ray diffraction, FT-IR and FT-Raman spectroscopies for the protiated and deuteriated crystals. The title compound crystallizes in triclinic system (Ci in Schönflies notation). Its vibrational spectra have been discussed on the basis o...

Bismuth-iodide type zero-dimensional (0-D) organic/inorganic hybrid compound [C6H4(NH3)2]2Bi2I10·4H2O was synthesized and characterized by single-crystal X-ray diffraction. It crystallizes in the monoclinic space group P21/n, with a = 11.483(5), b = 12.896(5), c = 14.974(5) Å, β = 112.437°(5) and Z = 4; and consists of a p-phenylenediammonium dicat...

The organic-inorganic hybrid, {(C(6)H(13)N(3))(2)[Pb(3)I(10)]}(n), was obtained by the reaction of 1-(3-ammonio-prop-yl)imidazolium triiodide and PbI(2) at room temperature. The structure contains one-dimensional {[Pb(3)I(10)](4-)}(n) polymeric anions spreading parallel to [001], resulting from face-face-edge association of PbI(6) distorted octa-he...

We use spectroscopic ellipsometry to study the elastic and thermodynamic properties of the structural first-order transition of the cooperative Jahn–Teller solid, RbMn[Fe(CN)6]. While the analysis of the thermal dependence of the dielectric constant revealed a remarkable energy shift in the metal-to-ligand charge transfer band, that of the refracti...

The tri (dimetylammonium) hexa-iodobismuthate of general formula [(CH3)2NH2]3[BiI6] is an organic–inorganic hybrid material. The crystal lattice is composed of discrete [BiI6] anions surrounded by dimethylamine cations. The X-ray diffraction pattern was obtained and indexed on the basis of rhombohedra unit cell with the R space group. Room temperat...

Single crystals of [C5H11NH3]Pb2I5, abbreviated C5Pb2I5, have been prepared. This compound is a new member of the family of the bilayered organic–inorganic lead–iodide based perovskites. Its crystal structure has been determined by X-ray diffraction. The inorganic sub-lattice consists of periodic bilayers of iodoplumbate octahedra. Each PbI6 octahe...

In this work, we report a theoretical study on molecular structure, vibrational spectra and nonlinear optical properties of orthoarsenic acid-tris-(hydroxymethyl)-aminomethane (OATA). The theoretical geometrical parameters in the ground state have been investigated by density functional method (B3LYP and BLYP) with 6-311G(d,p) basis set. The influe...

Single crystals of a hybrid organic/inorganic material with the formula (4-FC6H4C2H4NH3)2[PbI4] were synthesized and studied by X-ray diffraction, ellipsometry, and photoluminescence. The crystals consist of a self-assembled multilayer structure with a P21/a space group. The inorganic semiconductor sublattice is built up from corner-sharing PbI6 oc...

This paper presents the results of our calculations on the geometric parameters, vibrational spectra and hyperpolarizability of a non-linear optical material L-histidine chloride monohydrate. Due to the lack of sufficiently precise information on geometric parameters available in literature, theoretical calculations were preceded by re-determinatio...

An organic–inorganic hybrid perovskite (C4H9NH3)4Pb3I4Br6 was synthesized and studied by X-ray diffraction, Raman and infrared spectroscopies, optical transmission and photoluminescence. The title compound, abbreviated (C4)4Pb3I4Br6, crystallises in a periodic two-dimensional multilayer structure with P21/a space group. The structure is built up fr...

Theoretical calculations were performed using density functional theory for studying the molecular structure and vibrational spectra of the asymmetric squaraine [(2-dimethylamino-4-anilino) squaraine] (ADTCH3) in the ground state. The influence of intermolecular interactions effects on molecular properties have been considered by calculation perfor...

In this work, we report a combined experimental and theoretical study on molecular structure and vibrational spectra of l-histidinium dihydrogen phosphate-phosphoric acid, with particular emphasize on the correlation between the intermolecular hydrogen bonds and the hyperpolarizability. Single crystal of l-histidinium dihydrogen phosphate-phosphori...

This paper presents the results of our calculations of the geometric parameters, vibrational spectra and hyperpolarizability of a non linear optical material, l-histidine bromide. Due to the lack of sufficiently precise information on the geometric structure available in literature, theoretical calculations were preceded by re-determination of the...

Self-assembled organic–inorganic [C6H14N]PbI3 crystals were synthesized. The crystal structure consists of one-dimensional semiconductor chains formed by infinite PbI6 face-sharing octahedra aligned along the a-axis. The organic cations are linked to the inorganic chains by NH· · ·I hydrogen bonds and act as insulator barriers. The vibrational prop...

A new organic-inorganic hybrid, [Pb(2)I(4)(C(4)H(13)N(3))](n), was obtained by the reaction of C(4)N(3)H(10) and PbI(2) at room temperature. The structure is a three-dimensional polymer resulting from the association of PbI(6) octa-hedra and a mixed lead organic-inorganic PbI(4)(C(4)N(3)H(13)) coordination polyhedron. Both Pb atoms, two I atoms and...

Raman spectra (100-3200 cm(-1)) of polycrystalline samples of C(6)H(5)CH(2)NH(2)CH(3)H(2)PO(4).H(2)O were studied at temperature ranging from 77 to 350 K. By comparison with homologue compounds and calculated wavenumbers, an assignment of the observed bands is proposed. The thermal evolution of Raman spectra reveals an order-disorder phase transiti...

Raman spectra of LiCe(PO3)4 and KCe(PO3)4 powder samples were recorded at room temperature in the frequency range 200–1400 cm−1. In order to characterize the structure of the phosphate anion, we have performed a comparative study with the isomorphic compounds and we have undertaken a density functional theory DFT calculation of the geometries and t...

The molecular structure and vibrational spectra of 2-tert-butyldithio-5-methyl-1,3,4-thiadiazole (C7H12N2S3) in the ground state have been investigated by Hartree–Fock and density functional method (B3LYP and BLYP) with the 6-31G(d) basis set. The optimized geometric bond lengths and bond angles obtained by using HF and DFT show the best agreement...

We have prepared new semiconductor H3N(CH2)6NH3PbBr4 crystals which are self-assembled organic–inorganic hybrid materials. The grown crystals have been studied by X-ray diffraction, infrared absorption and Raman spectroscopy scattering. We found that the title compound, abbreviated 2C6PbBr4, crystallizes in a two-dimensional (2D) structure with a P...

The conformational stability and vibrational modes of the N-diethylendiamine organic cation (N-DD(2+)) were studied by experimental (Raman) spectroscopy combined with theoretical calculations. Various ab initio theories were used: Hartree-Fock (HF) theory, Möller-Plesset second-order perturbation (MP2) theory and density functional theory (DFT). Th...