Enhanced red emissions of europium(<scp>iii</scp>) chelates in DNA–CTMA complexes

Nakamura, Kazuki; Minami, Haruki; Sagara, Amika; Itamoto, Natsumi; Kobayashi, Norihisa

doi:10.1039/c8tc00255j

Cited by 20 publications

(16 citation statements)

References 42 publications

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“…The emission lifetimes were determined using a time-resolved fluorescence spectrometer (Quantaurus-Tau C11367-21, Hamamatsu photonics K. K., Japan). CPL measurements were conducted using a previously reported system 40 , 60 , which consisted of the following components: 375 nm LED (M365L2, Thorlabs Japan Inc., Japan), LED driver (DC2100, Thorlabs Japan Inc., Japan), photoelastic modulator (PEM-90, Hinds instruments, Inc. United States), photomultiplier tube (H7732-10, Hamamatsu photonics K. K., Japan), linearly polarized cubic prism (200,000:1), photomultiplier tube (H7732-10, Hamamatsu photonics K. K., Japan), and dual phase DSP lock-in amplifier (7265, Signal Recovery Ltd., United Kingdom). The appropriate detection wavelength of the monochromator and PEM was controlled by a PC.…”

Section: Methodsmentioning

confidence: 99%

“…On the other hand, the emission enhancement of luminophores due to their association with DNA was widely reported 36 – 39 . In our previous study, emission enhancement and induced CPL were achieved by associating an achiral Eu(III) complex with DNA-CTMA 40 . Therefore, a more distinctive enhancement of the optical properties can be expected by adding chiral sites to the Eu(III) complex, which interacts with DNA.…”

Section: Introductionmentioning

confidence: 99%

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Chiroptical property enhancement of chiral Eu(III) complex upon association with DNA-CTMA

Minami

Itamoto

Watanabe

et al. 2020

Sci Rep

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DNA-based materials have attracted much attention due to their unique photo-functional properties and potential applications in various fields such as luminescent and biological systems, nanodevices, etc. In this study, the photophysical properties of a chiral Eu(III) complex, namely (Eu(D-facam)3), within DNA films were extensively investigated. The enhancement of photoluminescence (more than 25-folds increase of luminescence quantum yield) and degree of circularly polarization in luminescence (glum = − 0.6) was observed upon interaction with DNA. Various photophysical analyses suggested that the emission enhancement was mainly due to an increase of the sensitization efficiency (high ηsens) from the ligands to Eu(III) and suppression of the vibrational deactivation upon immobilization onto the DNA molecule. From CD and VCD measurements, it was suggested that the coordination structure of Eu(D-facam)3 was affected by the interaction with DNA, suggesting that the structural change of Eu(D-facam)3 contributed to the improvement of its luminescent properties.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chiroptical property enhancement of chiral Eu(III) complex upon association with DNA-CTMA

Minami

Itamoto

Watanabe

et al. 2020

Sci Rep

Self Cite

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“…Only a few red emitters with high fluorescent QYs are reported for OLED fabrications till date [110,111]. Though few europium chelate complexes, pyran and porphyrin derivatives [112][113][114][115][116] are among those investigated as red-emitting materials, they suffer from various disadvantages such as (1) concentration/aggregation caused fluorescence quenching, (2) lack of good chromaticity, (3) lower EQE, (4) complicated synthetic routes, (5) inadequate overlap between the emission bands of the red dopant and the host matrix, (6) low doping levels and (7) high production cost [117][118][119][120]. Therefore, developing red emitters with improved color purity and high efficiency still remain a challenge.…”

Section: Red Emittersmentioning

confidence: 99%

A systematic review on 1,8-naphthalimide derivatives as emissive materials in organic light-emitting diodes

Kagatikar

Sunil

2022

J Mater Sci

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Organic light-emitting devices (OLEDs) have garnered significant research attention owing to their immense application prospects in leading technologies for full-color flat panel displays and eco-friendly solid-state lighting. They demonstrate exceptional features such as mercury-free construction, wide viewing angle, superior color quality and captivating flexibility. The requirements of light-emitting organic materials pertaining to high stability, lifetime and luminescence quantum yield, combined with the fabrication of devices with high performance efficiency, are highly challenging. Rational molecular design of 1,8-naphthalimide (NI) derivatives can offer quite promising results in achieving standard-light-emitting materials with a wide range of colors for OLED applications. This review is mainly focused on the synthesis and usage of varyingly substituted NI frameworks as luminescent host, dopant, hole-blocking and electron-transporting materials for OLEDs that emit not only red, orange, green and blue colors, but also function as white emitters, which can really have an impact on reducing the energy consumption. The future prospects that could be explored to improve the research in the highly promising field of OLEDs are also discussed. Graphical abstract

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“…[117][118][119][120] The lanthanide ions may be complexed directly to the molecule of interest, for instance in studies of metal binding proteins [121,122] and nucleic acids. [123] Alternatively, one can also use specific lanthanide chelates to probe nucleic acids, [124][125][126] amino acids, [127][128][129][130] proteins [131,132] and sugars [133][134][135] In these studies one has to rely on relatively strong interaction of the lanthanide chelate with the analyte to induce some change in the transition probabilities of the lanthanide ion. Using lanthanide chelates one can also go one step further and probe even weaker binding events by making use of energy and/or electron transfer processes with the analyte.…”

Section: Cpl From Isolated Small Moleculesmentioning

confidence: 99%

Circular Polarization of Luminescence as a Tool To Study Molecular Dynamical Processes

Meskers

2021

ChemPhotoChem

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Circular polarization of luminescence is a phenomenon that can be observed for chiral molecules in isotropic solution, for molecular aggregates and molecular materials. Also, the electroluminescence from chiral molecular materials in organic light emitting diodes can be nearly completely circularly polarized. In this review we focus on the latest developments in experimental results for the categories listed above. A unifying description of the origin of the circular polarization is still missing. We revisit the very earliest efforts to measure and understand circular polarization in light emission in order to better understand the present day confusion on the origins of the polarization. It seems that quantum field theory of electromagnetic interactions could provide leads for a comprehensive description of the circular polarization including contributions from helicity at all possible length scales from the molecular to the macroscopic.

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Enhanced red emissions of europium(iii) chelates in DNA–CTMA complexes

Abstract: Incorporation of a europium(iii) complex in DNA–CTMA enhances red emission and induces circularly polarized luminescence.

Cited by 20 publications

References 42 publications

Chiroptical property enhancement of chiral Eu(III) complex upon association with DNA-CTMA

Chiroptical property enhancement of chiral Eu(III) complex upon association with DNA-CTMA

A systematic review on 1,8-naphthalimide derivatives as emissive materials in organic light-emitting diodes

Circular Polarization of Luminescence as a Tool To Study Molecular Dynamical Processes

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