Judd-Ofelt analysis on pH sensitive Eu(tta)3bipy and Eu(dmh)3phen hybrid organic complexes in various organic solvents for solution processed OLEDs

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

doi:10.1016/j.mset.2019.06.005

Cited by 5 publications

(2 citation statements)

References 39 publications

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“…[17,18] It is a prime time to come-up with new, novel materials that may lead to innovative ideas. [19] Investigators have already come up with more interesting techniques in developing materials of nanometre dimensions. [20] However, in practice the synthesis of the pigments with desired characteristics can be quite difficult.…”

Section: Phenomenon Types Applicationsmentioning

confidence: 99%

Persistent phosphors for luminous paints: A review

Kalyani¹,

Jain

Dhoble

2022

Luminescence

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The article briefly reports the fundamental scientific principles and landmarks in the field of luminescence and further enlightens the importance of persistent phosphor that is now widely used in luminous paints. Its main focus is on phosphorescence that makes use of lanthanides that have gained paramount importance in various crosssections of luminescent applications. Both inorganic and organic afterglow materials, synthesis and characterization along with skilled researchers' essential updates on emerging trends and efforts are elucidated at length. It exclusively reviews the red/green/blue organic/inorganic/hybrid phosphorescent materials and the latest advances in the development of novel long afterglow materials that can accelerate the green technology in the world of luminescence.

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Section: Phenomenon Types Applicationsmentioning

confidence: 99%

Persistent phosphors for luminous paints: A review

Kalyani¹,

Jain

Dhoble

2022

Luminescence

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“…Additionally, non-radiative deactivation by co-coordinated, high frequency oscillators like H 2 O must be suppressed for high efficiency, which can be accomplished by the employment of ancillary ligands to avoid H 2 O-coordination. Dibenzylsulfoxide, triphenylphosphinoxide (TPPO), trioctylphosphinoxide (TOPO) or bidentate phenanthroline and bipyridine are well known examples ( Malta et al, 1998 ; e Silva et al, 2000 ; Teotonio et al, 2008 ), whereby the bypyridine co-ligands are less efficient in the Eu-diketonates under discussion ( Faustino et al, 2005 ; Thejo Kalyani et al, 2019 ). For Eu 3+ , which is in focus here, β-diketones are among the most investigated and attractive ligands, especially with fluoro-substituted alkyl groups and aromatic substituents ( Binnemans, 2005 ; Brito et al, 2009 ; Wang, 2010 ).…”

Section: Introductionmentioning

confidence: 99%

High brightness red emitting polymer beads for immunoassays: Comparison between trifluoroacetylacetonates of Europium

et al. 2023

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Efficiently luminescing spherical polymer particles (beads) in the nanoscale regime of up to approximately 250 nm have become very valuable tools in bioanalytical assays. Eu3+- complexes imbedded in polymethacrylate and polystyrene in particular proved to be extraordinarily useful in sensitive immunochemical and multi-analyte assays, and histo- and cytochemistry. Their obvious advantages derive from both, the possibility to realize very high ratios of emitter complexes to target molecules, and the intrinsically long decay times of the Eu3+-complexes, which allows an almost complete discrimination against bothersome autofluorescence via time-gated measuring techniques; the narrow line emission in conjunction with large apparent Stokes shifts are additional benefits with regard to spectral separation of excitation and emission with optical filters. Last but not least, a reasonable strategy to couple the beads to the analytes is mandatory. We have thus screened a variety of complexes and ancillary ligands; the four most promising candidates evaluated and compared to each other were β-diketonates (trifluoroacetylacetonates, R-CO-CH-CO-CF3, R = - thienyl, -phenyl, -naphthyl and -phenanthryl); highest solubilities in polystyrene were obtained with trioctylphosphine co-ligands. All beads had overall quantum yields in excess of 80% as dried powders and lifetimes well beyond 600 µs. Core-shell particles were devised for the conjugation to model proteins (Avidine, Neutravidine). Their applicability was tested in biotinylated titer plates using time gated measurements and a Lateral Flow Assay as practical examples.

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Investigations on optical properties of Eu_0.5Sm_0.5(TTA)₃tppo hybrid organic complexes molecularly doped in PMMA and PS matrices

Ugale

Kalyani²,

Dhoble

2020

Luminescence

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An attempt has been made to synthesize orange–red light‐emitting rare earth‐doped polymer matrices Eu0.5Sm0.5(TTA)3tppo (Eu = europium, Sm = samarium, TTA = thenoyltrifluoroacetone, tppo = triphenylphosphine oxide) hybrid organic complex by solution technique. Blended thin films were made by molecularly doping the complex in polymethylmethacrylate (PMMA) and polystyrene (PS) polymers at different weight percentages (5%, 10%). These films were solvated in basic and acidic media to explore the effect of solvent on its luminescence properties. UV–visible absorption spectra of these solvated films portray two peaks corresponding to π→π* and n→π* optical transitions in the range 240–275 nm and 370–390 nm in basic medium. Energy band gap of these thin films in basic medium was found between 3.16 eV to 3.20 eV and 3.12 eV to 3.22 eV in acidic medium. Photoluminescence spectra of all films in dichloromethane showed an intense peak at 614 nm, whereas in formic acid, the same were found at 475 nm, which fell in the orange–red and blue region of the visible spectrum, respectively. CIE coordinates of these solvated films in various solvents and at different weight percentages revealed tunable orange–red to blue light emission with change in polarity of the solvent. Therefore the synthesized complexes blended in the polymers can be shaped into flexible films for fabrication of organic light‐emitting diodes (OLEDs) with consistent results, proving their prospect as colour tunable light emissive materials for OLED devices, lasers, displays, and solid‐state lighting.

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Judd-Ofelt analysis on pH sensitive Eu(tta)3bipy and Eu(dmh)3phen hybrid organic complexes in various organic solvents for solution processed OLEDs

Cited by 5 publications

References 39 publications

Persistent phosphors for luminous paints: A review

Persistent phosphors for luminous paints: A review

High brightness red emitting polymer beads for immunoassays: Comparison between trifluoroacetylacetonates of Europium

Investigations on optical properties of Eu_0.5Sm_0.5(TTA)₃tppo hybrid organic complexes molecularly doped in PMMA and PS matrices

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Judd-Ofelt analysis on pH sensitive Eu(tta)3bipy and Eu(dmh)3phen hybrid organic complexes in various organic solvents for solution processed OLEDs

Cited by 5 publications

References 39 publications

Persistent phosphors for luminous paints: A review

Persistent phosphors for luminous paints: A review

High brightness red emitting polymer beads for immunoassays: Comparison between trifluoroacetylacetonates of Europium

Investigations on optical properties of Eu0.5Sm0.5(TTA)3tppo hybrid organic complexes molecularly doped in PMMA and PS matrices

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Investigations on optical properties of Eu_0.5Sm_0.5(TTA)₃tppo hybrid organic complexes molecularly doped in PMMA and PS matrices