Exploration of spectroscopic properties of solvated tris(thenoyltrifluoroacetonate)(2,2′-bipyridine)europium(III)red hybrid organic complex for solution processed OLEDs and displays

Chitnis, Dipti; Thejokalyani, N.; Dhoble, S.J.

doi:10.1016/j.jlumin.2016.12.049

Cited by 25 publications

(5 citation statements)

References 41 publications

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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%

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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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Section: Resultsmentioning

confidence: 99%

“…18. 20,26,29,[38][39][40][41][42][43] The best linear fit of the data points, which is a straight line little more inclined than the actual one has been plotted. The results of the optical measurements and photo-physical properties of the synthesized (Cl-H-DPQ) 2 Ir(acac) complex are summarized in Table II.…”

Section: Stokesmentioning

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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“…To verify the effect of solvent polarity, Stokes shifts (Δ ν ) of 1 – 8 in a variety of solvents were plotted against the solvent polarity parameter Δ f ( ε , n ) with the general form of the Lippert-Mataga equation given below [ 19 , 20 ]

in which Δ ν = ν abs − ν em stands for Stokes shift, ν abs and ν em are absorption and emission frequency (cm −1 ), ħ is the Planck’s constant, c is the velocity of light in vacuum, a is the Onsager radius, and b is a constant. Δ f is the orientation polarizability, ε is the refractive index, n is the dielectric constant, μ e and μ g are the dipole moments of the emissive and ground states, respectively, and ε 0 is the permittivity of the vacuum.…”

Section: Resultsmentioning

confidence: 99%

“…To verify the effect of solvent polarity, Stokes shifts (∆ν) of 1-8 in a variety of solvents were plotted against the solvent polarity parameter ∆f (ε, n) with the general form of the Lippert-Mataga equation given below [19,20]…”

Section: Solvatochromismmentioning

confidence: 99%

Substituted 2-Phenacylbenzoxazole Difluoroboranes: Synthesis, Structure and Properties

Skotnicka

Czeleń

2020

Molecules

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Novel fluorescent dyes such as benzoxazole-boron complexes, bearing β-ketoiminate ligands, have been synthesized and characterized with a focus on the influence of a substituent on the basic photophysical properties. 1H, 11B, 13C, 15N, and 19F nuclear magnetic resonance (NMR) spectra of substituted 2-phenacylbenzoxazole difluoroboranes have been recorded and discussed. It is worth mentioning that a high correlation coefficient was found between 15N-NMR parameters and substituent constants. The photophysical properties of these new dyes have been investigated by fluorescence and ultraviolet-visible (UV-Vis) absorption spectroscopy. The geometry optimization, vibrational spectra, and the HOMO and LUMO energies were calculated based on density functional theory with the use of the B3LYP functional and 6-311++G(d,p) basis set.

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“…For large flat‐panel displays and inexpensive lighting applications, solution coating processes are preferred due to their low fabrication cost and easy scalability . The choice of solvent is significant as the emission intensity in that particular solvent depends upon the absorption spectra of the solvated complex . The advantage of most of the organic/hybrid organic complexes is their solubility in most of the organic solvents irrespective of acidic or basic, paving an approach to study the absorption as well as emission spectra in different solvents with different molar ratios.…”

Section: Introductionmentioning

confidence: 99%

Assessment of spectroscopic parameters of solvated Eu(dmh)₃phen organometallic complex in various basic and acidic solvents

Chitnis

Kalyani²,

Dhoble

2018

Luminescence

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We report on the comprehension of novel europium activated hybrid organic Eu(dmh) phen (Eu: europium, dmh: 2,6-dimethyl-3,5-heptanedione, phen: 1,10 phenanthroline) organo-metallic complexes, synthesized at different pH values by the solution technique. Photo physical properties of these complexes in various basic and acidic solvents were probed by UV-vis optical absorption and photoluminescence (PL) spectra. Minute differences in optical absorption peaks with variable optical densities were encountered with the variation in solvent from basic (chloroform, toluene, tetrahydrofuran) to acidic (acetic acid) media, revealing bathochromic shift in the absorption peaks. The PL spectra of the complex in various acidic and basic organic solvents revealed the position of the emission peak at 613 nm irrespective of the changes in solvents whereas the excitation spectrum almost matched with that of the UV-vis absorption data. The optical density was found to be maximum for the complex with pH 7.0 whereas it gradually decreased when pH was lowered to 6.0 or raised to 8.0 at an interval of 0.5, demonstrating its pH sensitive nature. Several spectroscopic parameters related to probability of transition such as absorbance A(λ), Napierian absorption coefficient α(λ), molecular absorption cross-section σ(λ), radiative lifetime (τ ) and oscillator strength (f) were calculated from UV-vis spectra. The relative intensity ratio (R-ratio), calculated from the emission spectra was found to be almost the same in all the organic solvents. The optical energy gap, calculated for the designed complexes were found to be well in accordance with the ideal acceptance value of energy gap of the emissive materials used for fabrication of red organic light-emitting diode (OLED). The relation between Stoke's shift and solvent polarity function was established by Lippert-Mataga plot. This remarkable independence of the electronic absorption spectra of Eu complexes on the nature of the solvent with unique emission wavelength furnishes its potential to serve as a red light emitter for solution processed OLEDs, display panels and solid-state lighting.

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Exploration of spectroscopic properties of solvated tris(thenoyltrifluoroacetonate)(2,2′-bipyridine)europium(III)red hybrid organic complex for solution processed OLEDs and displays

Cited by 25 publications

References 41 publications

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

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

Substituted 2-Phenacylbenzoxazole Difluoroboranes: Synthesis, Structure and Properties

Assessment of spectroscopic parameters of solvated Eu(dmh)₃phen organometallic complex in various basic and acidic solvents

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Exploration of spectroscopic properties of solvated tris(thenoyltrifluoroacetonate)(2,2′-bipyridine)europium(III)red hybrid organic complex for solution processed OLEDs and displays

Cited by 25 publications

References 41 publications

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

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

Substituted 2-Phenacylbenzoxazole Difluoroboranes: Synthesis, Structure and Properties

Assessment of spectroscopic parameters of solvated Eu(dmh)3phen organometallic complex in various basic and acidic solvents

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Assessment of spectroscopic parameters of solvated Eu(dmh)₃phen organometallic complex in various basic and acidic solvents