Synthesis of indenocarbazole-based efficient deep-blue fluorescent emitter with a narrow emission band

Park, Eun Young; Shin, Seongjun; Vasudevan, Thangaraji; Kim, Soyeon; Lee, Jihoon; Suh, Min Chul

doi:10.1016/j.jiec.2021.11.053

Cited by 5 publications

(2 citation statements)

References 29 publications

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“…The emission FWHM values of these compounds are relatively narrow for pyrene-based luminescent materials (Figure D and Table S3). ,− This is mainly attributed to the presence of the −OH group at the 2-position acting as a steric hindrance group, which enhances the rigidity of the molecular scaffolds and suppresses vibrational coupling via a steric effect and strong hydrogen bonding, facilitating the lower fwhm both in solution and in the film state. On the other hand, the increased FWHM for 5 may be ascribed to the molecular aggregation of the large π-conjugated planar molecules.…”

Section: Resultsmentioning

confidence: 99%

Pyrene-Based Deep-Blue Fluorophores with Narrow-Band Emission

Liu,

Zhang,

Wang

et al. 2024

J. Org. Chem.

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High-efficiency narrow-band luminescent materials have attracted intense interest, resulting in their great colorimetric purity. This has led to a variety of high-tech applications in highdefinition displays, spectral analysis, and biomedicine. In this study, a rigid pyrene core was employed as the molecular backbone, and four narrow-band pyrene-based blue emitters were synthesized using various synthetic methods (such as Lewis-acid catalyzed cyclization domino reactions, Pd-catalyzed coupling reactions like Suzuki− Miyaura and Sonogashira). Due to the steric effect of the hydroxy group at the 2-position, the target compounds exhibit deep blue emission (<429 nm, CIEy < 0.08) with full width at half-maximum (FWHM) less than 33 nm both in solution and when solidified. The experimental and theoretical results indicated that the substituents at the 1-and 3-positions afford a large dihedral angle with the pyrene core, and the molecular motion is almost fixed by multiple intra-and intermolecular hydrogen bonding interactions in the crystallized state, leading to a suppression of the vibrational relaxation of the molecular structure. Moreover, we observed that the suppression of the vibrational relaxation in the molecular structures and the construction of rigid conjugated structures can help develop narrow-band organic light-emitting materials.

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Section: Resultsmentioning

confidence: 99%

Pyrene-Based Deep-Blue Fluorophores with Narrow-Band Emission

Liu,

Zhang,

Wang

et al. 2024

J. Org. Chem.

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“…Stable and efficient blue fluorescent materials are critical for full‐color displays and efficient and stable white light emission 1,2 . Conventional blue fluorescent materials have defects such as high toxicity, poor stability, poor compatibility, and pollution of the environment, which seriously limit their practical application and development 3–6 . Blue fluorescent transition metal complexes have attracted much attention due to their many advantages such as non‐toxicity, low cost, good stability, and high fluorescence efficiency.…”

Section: Introductionmentioning

confidence: 99%

Blue fluorescent waterborne polyurethane‐based transition metal complexes with antibacterial activity

Hu,

Cheng,

Yang

et al. 2024

J of Applied Polymer Sci

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Efficient and stable blue fluorescent materials are the key components of light‐emitting devices and have received wide attention. Herein, transition metal complexes Zn(5‐AQ)2, Cu(5‐AQ)2, and Cd(5‐AQ)2 are prepared by using 5‐aminoquinoline (5‐AQ) as ligand and Zn2+, Cu2+, and Cd2+ as the central ions, respectively. Then, waterborne polyurethane (WPU)‐based transition metal complexes Zn(5‐AQ)2‐WPU, Cu(5‐AQ)2‐WPU, and Cd(5‐AQ)2‐WPU with different emission wavelengths of blue fluorescence are prepared by bonding Zn(5‐AQ)2, Cu(5‐AQ)2, and Cd(5‐AQ)2 to polyurethane chains as chain extenders, respectively. Noteworthily, with the increase of transition metal ion radius (Zn2+ < Cu2+ < Cd2+), the fluorescence emission wavelengths of the complexes showed different degrees of blue‐shift, and the blue‐shifted wavelengths showed a decreasing trend. Importantly, their fluorescence colors are blue‐shifted from blue‐green to blue with different emission wavelengths after accessing the polyurethane backbone, which has potential applications in the field of tuning white LED materials. The thermal decomposition temperatures of Zn(5‐AQ)2‐WPU, Cu(5‐AQ)2‐WPU, and Cd(5‐AQ)2‐WPU are above 220°C with good thermal stability, and their fluorescence lifetimes are prolonged by 8.817, 8.896, and 6.489 ns, respectively, compared with the complexes. Furthermore, WPU transition metal complexes with water as a dispersive medium have an antibacterial efficiency of up to 100% against Escherichia coli, which is an environmentally friendly antibacterial material with broad application prospects.

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