Spectroscopic and optoelectronic investigations of 3,8-bis(3,4-(ethylenedioxy)thien-2-yl)-1,10-phenanthroline

Abstract

1,10-Phenanthroline-based luminescent materials play an important role as an excellent class of optoelectronic materials due to their remarkable and novel attributes for optoelectronic applications. There is an enormous demand of luminescent materials in many fields. The foremost objective of this paper is to synthesize fluorescent derivatives of 1,10-phenanthroline. The electronic effect of the substituents on the heteroaromatic ligand has been reviewed in solid state. These ligands were characterized by electrochemical study and spectroscopically. The value of energy band gap is estimated to be 3.0-4.5 eV for synthesized compounds. Photophysical features were analyzed through photoluminescence spectrometer, which indicates a strong impact of the substituents on the photoluminescent properties of the phenanthroline ligand. Upon excitation in ultraviolet region, intense broad band appeared in emission spectra of synthesized compounds lie in visible region which is further supported by CIE color coordinates. The detailed explanation about the geometry and frontier molecular orbitals calculation was carried out with the help of Avogadro and ORCA software.

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

“…From absorption spectral data of the complexes, the optical band gap (E g ) can be estimated easily. Tauc's relationship (Equation 1) helps in the estimation of the band gap values of the complexes [ 40,41 ] : where α, E and m represent the absorption coefficient, energy of photons, and optical parameters, respectively. In Tauc's plot a tangent is drawn to the x‐axis that provides the value of E g of the complexes.…”

“…[39] From absorption spectral data of the complexes, the optical band gap (E g ) can be estimated easily. Tauc's relationship (Equation 1) helps in the estimation of the band gap values of the complexes [40,41] :…”

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

“…The colour parameters were calculated from the emission spectra of the complexes by means of the CIE calculator. The CIE (1971) colour coordinates (u′, v′) provided more consistent colour spacing and were estimated from the (x, y) colour coordinates using Equation (2): [ 60,61 ] Correlated colour temperature (CCT) is the significant luminescence parameter used for the lighting industry. CCT was estimated from the (x, y) coordinates as represented by the McCamy equation (3) written as: [ 62 ] The symbol n represents the inverse slope line and can be calculated using (x − x e )/(y − y e ), where x e and y e are chromaticity epicentre coordinates with values 0.332 and 0.186, respectively.…”

“…The colour parameters were calculated from the emission spectra of the complexes by means of the CIE calculator. The CIE (1971) colour coordinates (u 0 , v 0 ) provided more consistent colour spacing and were estimated from the (x, y) colour coordinates using Equation ( 2): [60,61]…”

Mononuclear luminous β‐diketonate Ln(III) complexes with heteroaromatic auxiliary ligands: synthesis and luminescence characteristics

“…3,8‐dibromo‐1,10‐phenanthroline (PBr), 3‐bromo‐8‐(3,4‐[ethylenedioxy]thien‐2‐yl)‐1,10‐phenanthroline (MP), and 3,8‐bis(3,4‐[ethylenedioxy]thien‐2‐yl)‐1,10‐phenanthroline (DP), were prepared in the laboratory. [ 22 ] Complexes Sm(Hfodo) 3 Phen (Sm1), Sm(Hfodo) 3 PBr (Sm2), Sm(Hfodo) 3 MP (Sm3), Sm(Hfodo) 3 DP (Sm4), Tb(Hfodo) 3 Phen (Tb1), Tb(Hfodo) 3 PBr (Tb2), Tb(Hfodo) 3 MP (Tb3), and Tb(Hfodo) 3 DP (Tb4) have been reported. Complexes such as Sm1 and Tb1 have already been described in the literature.…”