Preparation and characterization of ruthenium based organic composites for optoelectronic device application

Basha, Sk. Shahenoor; Sundari, G. Sunita; Kumar, K. Vijay; Rao, K. Ramachandra; Rao, M. C.

doi:10.1016/j.ijleo.2018.03.071

Cited by 4 publications

(3 citation statements)

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“…Because of their unique and remarkable luminescent properties, trivalent lanthanide cations remain extensively studied for applications in optoelectronic devices [16], telecommunications, sensors, biomedical imaging [17,18] and solar energy conversion [19]. Often, their luminescent complexes with various ligands have been incorporated into various host matrices, with particular attention being paid to polymer matrices [20,21]. Tb(III) cations were introduced into poly(vinyl alcohol) (PVA) matrices, resulting in monoliths with intense emission at 543 nm due to the 5 D 4 → 7 F 5 transition used in the preparation of doped monolithic silica glass [22].…”

Section: Introductionmentioning

confidence: 99%

Photoluminescent Polymer Aerogels with R, G and B Emission

Stan

Măluțan

Volf

et al. 2022

IJMS

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In this work, three new polymer aerogels based on 2-hydroxy ethyl methacrylate (HEMA) complexes with Eu(III), Tb(III) and La(III) are prepared and investigated. The polymer aerogels present strong photoluminescence with emissions located in the red, green and blue regions of the visible spectrum. Depending on the water content used during the preparation path, the consistency of the photoluminescent aerogels varies from rigid, regularly shaped monoliths to a flexible, fibrous material with very low density. The morpho-structural investigation was performed by FT-IR, XPS and SEM. Thermal behavior was also evaluated, while steady-state fluorescence spectroscopy, absolute PLQY and lifetime were used for the investigation of their luminescent properties. The impressive photoluminescent emission located in the red, green and blue areas of the visible spectrum is preserved irrespective of the selected porosity. Their photo-emissive properties, tunable porosity and the convenience of the preparation path could be some arguments for applications as photonic conversion mediums in special-purpose optoelectronic devices or sensors.

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Section: Introductionmentioning

confidence: 99%

Photoluminescent Polymer Aerogels with R, G and B Emission

Stan

Măluțan

Volf

et al. 2022

IJMS

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“…The excited states of ruthenium polypyridyl complexes have been used extensively in many applications, including photoelectrosynthesis cells, 1,2 dye-sensitized solar cells, 3−6 DNA intercalation and sensing, 7 charge transfer, 8 photon upconversion, 9,10 release of drug molecules, 11 photonasty, 12 sensing, 13 optoelectronics, 14 and catalysis, 15 among others. 16−19 Because of the wide range of uses, there has been great interest in understanding and controlling the excited states of Ru(II) complexes to improve their properties, including lifetime, reactivity, and excitation energy.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The excited states of ruthenium polypyridyl complexes have been used extensively in many applications, including photoelectrosynthesis cells, , dye-sensitized solar cells, − DNA intercalation and sensing, charge transfer, photon upconversion, , release of drug molecules, photonasty, sensing, optoelectronics, and catalysis, among others. − Because of the wide range of uses, there has been great interest in understanding and controlling the excited states of Ru(II) complexes to improve their properties, including lifetime, reactivity, and excitation energy. For example, the steric bulk and bite angle of the ligands have been shown to have a pronounced effect on the excited state reactivity and lifetime in Ru(II) complexes, , and the replacement of nitrogen atoms by isoelectronic carbon, as well as the use of N-heterocyclic carbenes result in marked changes to the excited state parentage and dynamics. , The desirable properties of Ru(II) complexes can vary from one application to another, such as the requirement of low-lying dissociative metal centered ( 3 MC) states for drug release. , In contrast, higher energy 3 MC states are required to attain longer lifetimes of the lowest energy metal-to-ligand charge transfer ( 3 MLCT) excited state useful for solar energy conversion, sensing, and photoredox catalysis. − One particular property that may be useful for both areas, enhanced charge injection into semiconductors and increased population of the 3 MC state(s) for drug release, is the presence of a 3 MLCT state at higher energy that is sufficiently long-lived to afford reactivity.…”

Section: Introductionmentioning

confidence: 99%

Unusually Slow Internal Conversion in N-Heterocyclic Carbene/Carbanion Cyclometallated Ru(II) Complexes: A Hammett Relationship

Kender

Turró

2019

J. Phys. Chem. A

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A series of six [Ru(bpy) 2 (NHC-R)] + complexes were synthesized and characterized, where bpy = 2,2′-bipyridine and NHC-R is an N-heterocyclic carbene covalently linked to a carbanion with a number of substituents, R = −OMe (1), −Me (2), −H (3), −Cl (4), −CO 2 Et (5), and −NO 2 (6). The effects of these strongly σ-donating NHC-R ligands on the ground-state electronic structure and on the excited-state character and dynamics were probed using electrochemistry, TD-DFT calculations, and steady-state absorption and emission spectroscopies, along with ultrafast transient absorption and timeresolved IR measurements. The excitation of 1−5 with a 400 nm pulse (irf = 85 fs) results in the population of a high energy singlet state, S n , that rapidly intersystem crosses into a high-lying triplet state, T n . Over the course of 7−22 ps, T n relaxes to the lowest lying triplet state, T 1 , which is metal/ligand-to-ligand charge transfer, 3 Ru(d)/NHC(π) → bpy(π*) in character. These 3 ML-LCT states decay to regenerate the ground state with lifetimes, τ, that range from <8 to 15 ns at 298 K and from 10 to 23 ns at 77 K in CH 3 CN. Both the excited-state lifetime at 77 K and the T n → T 1 rate of internal conversion of 1−5 are dependent on the substituent R, and the latter correlates with the Hammett parameter (σ + p ) of the NHC-R ligand. Excitation of 1−5 with low energy light, 550−670 nm, does not result in the population of T n , as only T 1 is observed. In the case of 6, excitation is expected to populate a 1 Ru(d)/NHC(π) → NHC(π*) state localized on the NHC-NO 2 ligand, which decays to a higher energy 3 Ru(d)/NHC(π) → NHC(π*) state followed by internal conversion to the 3 Ru(d)/NHC(π) → bpy(π*) T 1 state with τ = 250 ps; the population of both states is independent of excitation wavelength in 6. This work demonstrates that the introduction of one NHC-R ligand in these complexes permits the population of a higher energy triplet state that decays to T 1 in the picosecond time range. The relatively slow T n → T 1 internal conversion in these complexes makes the population of the higherenergy state potentially useful for more efficient charge injection into semiconductors for solar energy conversion or to aid in accessing dissociative metal-centered states for drug delivery. Overall, this work shows the ability to synthetically access valuable excited-state dynamics using the two different Ru−C bonds of the asymmetric NHC-R ligands.

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Structural, electrical and dielectric studies of PVA based NaNO ₃ Polymer electrolytes for battery applications

Kiran

Jyothi²,

Rao³

et al. 2022

International Journal of Ambient Energy

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Preparation and characterization of ruthenium based organic composites for optoelectronic device application

Cited by 4 publications

References 50 publications

Photoluminescent Polymer Aerogels with R, G and B Emission

Photoluminescent Polymer Aerogels with R, G and B Emission

Unusually Slow Internal Conversion in N-Heterocyclic Carbene/Carbanion Cyclometallated Ru(II) Complexes: A Hammett Relationship

Structural, electrical and dielectric studies of PVA based NaNO ₃ Polymer electrolytes for battery applications

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Preparation and characterization of ruthenium based organic composites for optoelectronic device application

Cited by 4 publications

References 50 publications

Photoluminescent Polymer Aerogels with R, G and B Emission

Photoluminescent Polymer Aerogels with R, G and B Emission

Unusually Slow Internal Conversion in N-Heterocyclic Carbene/Carbanion Cyclometallated Ru(II) Complexes: A Hammett Relationship

Structural, electrical and dielectric studies of PVA based NaNO 3 Polymer electrolytes for battery applications

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Structural, electrical and dielectric studies of PVA based NaNO ₃ Polymer electrolytes for battery applications