Dual-Functional Carbon Dot Films: Blue-Light Filtration and Cyan-Light Conversion for Healthier White Light-Emitting Diodes

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 23, 2025

Blue light emitted by commercial white light-emitting diodes (WLEDs) in the 440-470 nm range poses ocular health risks with prolonged exposure. Effective filtration is crucial for health-conscious lighting, but traditional filters often cause color distortion completely removing blue emission. In this study, we address challenge synthesizing carbon dots (CDs) strong absorption at 460 and bright cyan emission 485 nm, featuring a photoluminescence quantum yield of 65% narrow full width half-maximum 30 nm. When embedded poly(vinyl alcohol) (PVA) matrix, CDs@PVA films effectively filter UV-to-blue light, reducing blue-light ratio from 27.2% to 2.7%. At same time, preserves light's spectral composition, achieving rendering index 83 ± 5. This dual functionality demonstrates potential CDs enable safer WLEDs that improve both lighting quality.

Language: Английский

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Challenges in Synthesizing Hexagonal Boron Nitride “Quantum” Dots

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 27, 2025

Fluorescent nanodots derived from hexagonal boron nitride (h-BN) have garnered significant attention over the past decade. As a result, various synthesis methods─encompassing both bottom-up hydrothermal reactions and top-down exfoliation processes─have been deemed "successful" in producing BN nanodots. Nevertheless, this Perspective emphasizes that substantial challenges remain of "true" composed mainly h-BN units, as many so-called successful syntheses reported literature involve some mischaracterizations. Here, we highlight crucial necessity for strict conditions to facilitate production authentic Furthermore, it is imperative re-evaluate optical properties photoluminescence mechanisms these nanodots, entailing establishment clear criteria what constitutes

Language: Английский

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Deep-Blue and Narrowband-Emitting Carbon Dots from a Sustainable Precursor for Random Lasing

ACS Applied Nano Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 30, 2025

Deep-blue (DB) emitters that feature high photoluminescence quantum yield (PLQY) and narrow spectral bandwidth are desired for a variety of optoelectronic applications, particularly lighting, illumination, lasing. Currently favored DB constitute dots comprising cadmium or lead organic compounds derived from petroleum, but they suffer toxicity sustainability issues. Here, we report the solvothermal synthesis DB-emitting carbon (DB-CDs) using bioderivable phloroglucinol as sole starting material, which exhibit peak emission wavelength 403 nm, full width at half-maximum 35 PLQY 61% in ethanol. The DB-CDs with planar structure demonstrated to comprise distinct graphene segments polyether-cross-link network, former functioning fluorophore. application merit is exemplified by their implementation gain medium random laser device, exhibits threshold optical power density 40.5 kW cm–2. This study thus demonstrates path toward efficient sustainable deep-blue emitters, can be exploited practical applications.

Language: Английский

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Solvent-engineered in-situ heterogenization of copper-based sulfides for broadening electromagnetic wave absorption

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160742 - 160742

Published: Feb. 1, 2025

Language: Английский

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Bioinspired carbon quantum dots nanofluid fabricated by a facile two-step synthesis toward high performance lubrication

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 161810 - 161810

Published: March 1, 2025

Language: Английский

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Computational evaluation of Ni@B12N12 and Ti@B12N12 endohedral clusters as carriers for melphalan and sulforaphane anticancer drugs

Journal of Molecular Liquids, Journal Year: 2025, Volume and Issue: unknown, P. 127457 - 127457

Published: March 1, 2025

Language: Английский

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