Portrayal of structural, thermal and optical properties of pH sensitive Eu(TTA)3bipy hybrid organic complex for OLEDs

Chitnis, Dipti; Kalyani, N. Thejo; Dhoble, S.J.

doi:10.1016/j.ijleo.2016.08.127

Cited by 16 publications

(6 citation statements)

References 14 publications

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“…It can be associated with one, two or three additional neutral ancillary ligands (Lewis bases) in addition to the three β-diketones, depending in general on steric factors, due to the tendency of the Ln 3+ ion to expand its sphere of coordination, reaching coordination numbers of seven, eight and nine. The most commonly used ancillary ligands are pyridine (PY), bipyridine (BIPY), terpyridine (TERPY) and phenanthroline (PHEN) [23][24][25][26][27]. In the specific case of this work, ligands derived from 2-aminopyridine, 2aminopyrimidine, and bipyridine were used.…”

Section: Introductionmentioning

confidence: 99%

Novel trivalent europium β-diketonate complexes with N-(pyridine-2-yl)amides and N-(pyrimidine-2-yl)amides as ancillary ligands: Photophysical properties and theoretical structural modeling

Lima

Bueno

Silva

et al. 2020

Journal of Luminescence

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Section: Introductionmentioning

confidence: 99%

Novel trivalent europium β-diketonate complexes with N-(pyridine-2-yl)amides and N-(pyrimidine-2-yl)amides as ancillary ligands: Photophysical properties and theoretical structural modeling

Lima

Bueno

Silva

et al. 2020

Journal of Luminescence

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“…The peak at ~1145 cm −1 was attributed to an alkyl C–F bond. [ 36 ] Vibrational spectral data of complexes showed the isostructural nature of synthesized europium complexes.…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2022

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Solid ternary europium complexes consisting of fluorinated β‐diketone (thenoyltrifluoroacetone, TTFA) and heteroaromatic bidentate auxiliary ligands were synthesized. The luminescence features of the complexes were estimated using various spectral measurements and clearly proved that the Eu3+ ion is efficiently sensitized by ligands by an antenna effect. Photoluminescence excitation spectra have shown that Eu(III) complexes are excited effectively in the ultraviolet (UV) region and the corresponding emission spectra consist of characteristic peaks attributed to the 5D0→7FJ transitions of the europium ion with the strongest emission peak at 611 nm (5D0→7F2). From photoluminescence (PL) data, decay time, Judd–Ofelt parameters, transition rates, and quantum efficiency of the complexes were also determined. The Commission Internationale de l'éclairage (CIE) colour coordinates indicated the bright red emission of ternary europium complexes. Correlated colour temperature values indicated the utilization of these complexes in display devices. Judd–Ofelt and photophysical parameters were also estimated theoretically using LUMPAC software. Various frontier molecular orbitals and their respective energy were determined. These red emissive europium complexes could be utilized for fabricating solid‐state lighting systems.

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“…As the granules are in μm range, the amount of light absorption and emission increases due to high packing density. [24][25][26] Thermal analysis.-Thermo gravimetric analysis (TGA) and differential thermal analysis (DTA).-Simultaneous measurements of TGA and DTA were carried out to assess the direct co-relation between weight and heat changes as a function of time and temperature in various gaseous environments. Thermal stability was evaluated using the TGA curve in the temperature range of 35 °C-500 °C.…”

Section: Resultsmentioning

confidence: 99%

Appraisal of Structural, Thermal, and Optical Properties of Novel Bluish-Violet Light-Emitting Cyclometallated Iridium (III) (Cl-H-DPQ)2Ir(acac) Complex for OLED Devices

Khotele

Kalyani

Pode

et al. 2021

ECS J. Solid State Sci. Technol.

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Synthesis and evaluation of structural, thermal, and optical properties of a novel bluish-violet light-emitting cyclometallated Iridium (Ir3+) complex [(Cl-H-DPQ)2Ir(acac)] containing 4-(6-chloro-4-phenylquinolin-2-yl) phenol as main ligand and acetyl acetone (acac) as ancillary ligand by employing Friedlander reaction at 105 °C is reported. X-ray diffraction of the complex reveals its crystalline nature and scanning electron microscopy illustrates polygonal morphology within the nm range. FTIR spectra confirms the structure formation and molecular bonding of the synthesized complex. DTA/TGA curves reveal its thermal stability to about 252 °C demonstrating its potential at elevated temperatures. UV–vis optical absorption and photoluminescence spectra were carried out in solid state form and in various organic solvents ranging from basic to acidic media. This facilitated estimation of the energy band gap and Stokes shift in various organic solvents. When excited at 350 nm light, the complex emits prominent bluish-violet light peaking at 468 nm in the solid-state form. However, it shows a bathochromic shift in acidic media and a hypsochromic shift in basic media. CIE chromaticity coordinates (x, y) of (Cl-H-DPQ)2Ir(acac) complex in solid state form was found to be (0.2631, 0.2358), and in acetic acid and formic acid they were found to be (0.325, 0.159) and (0.402, 0.198), respectively, while in chloroform and dichloromethane they were found to be (0.1616, 0.043) and (0.1756, 0.062), respectively. The Stokes shift was found to be in the range of 6480–15,719 cm−1 in various acidic and basic solvents. The solvent sensitivity to chromophore was probed by a Lippert–Mataga plot. These results reflect the potential of the (Cl-H-DPQ)2Ir(acac) complex as a bluish-violet light-emitting material for organic light-emitting diodes, displays, and solid-state lighting.

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Portrayal of structural, thermal and optical properties of pH sensitive Eu(TTA)3bipy hybrid organic complex for OLEDs

Cited by 16 publications

References 14 publications

Novel trivalent europium β-diketonate complexes with N-(pyridine-2-yl)amides and N-(pyrimidine-2-yl)amides as ancillary ligands: Photophysical properties and theoretical structural modeling

Novel trivalent europium β-diketonate complexes with N-(pyridine-2-yl)amides and N-(pyrimidine-2-yl)amides as ancillary ligands: Photophysical properties and theoretical structural modeling

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

Appraisal of Structural, Thermal, and Optical Properties of Novel Bluish-Violet Light-Emitting Cyclometallated Iridium (III) (Cl-H-DPQ)2Ir(acac) Complex for OLED Devices

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