Low-temperature molten salt enabled synthesis of solid-state emissive carbon dots with high endurance and >99% quantum yields

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 19, 2025

Fluorescent carbon dots (CDs) have garnered significant attention for their unique optoelectronic properties and applications, but practical employment is hampered by the excessive synthesis temperature, tedious post-processing limited solid-state luminescence efficiency. Herein, we develop a facile molten salt method to achieve one-step of full-color CDs with efficient emission. Comprehensively, kilogram-scale quantum yield 90% can be readily synthesized via salt-assisted approach under mild conditions (100–142°C) within 10 minutes. The spectral characterization density functional theory calculation confirm that zinc ion coordination occur in liquated environment, which facilitates polymerization precursors at lower temperatures, suppresses formation non-radiative recombination channels on surface, further enhances solid. machine learning used optimize CDs’ luminous efficiency up 99.86%, evoking excellent performance CDs-based light-emitting diodes maximum 156.29 lm W^–1 drive backlit display long-persistent lifetime (T₉₅ 100 cd m^–2 = 45108.7 h). This work provides pathway design fabrication advanced carbon-based luminescent materials, significantly contributing advancement next-generation lighting technologies.

Language: Английский

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Solution-Processed Quantum Dot Micropatterns: From Liquid Manipulation to High-Performance Quantum Dot Light-Emitting Diode Devices

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

Published: March 11, 2025

Micropatterning quantum dots (QDs) is a key process for making high-performance dot light-emitting diodes (QLEDs), which have shown advantages in lighting and displays. So far, various solution processes been developed fabricating micropatterned QDs, where both uniform distribution well-defined edges are desirable. Very recently, with the flourishing of near-eye displays, high-resolution QD micropatterns appear particularly attractive, regretfully progressed poorly due to extremely complicated liquid dynamics at microscale. Here, we systematically discussed several representative strategies micropatterning including transfer printing, photolithography, inkjet structure-confined transfer. The fundamentals involved manipulation applications QLEDs were summarized, as well remaining challenges possible solutions from viewpoint QDs high uniformity, resolution, multicolor. We believe that perspective would inspire fabrication high-quality QLEDs.

Language: Английский

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Quantum-Well-Embedded InGaN Quantum Dot Vertical-Cavity Surface-Emitting Laser and Its Photoelectric Performance

Photonics, Journal Year: 2025, Volume and Issue: 12(3), P. 276 - 276

Published: March 17, 2025

An electrically injected vertical-cavity surface-emitting laser (VCSEL) with quantum-well-embedded InGaN quantum dots (QDs) as the active region was designed. The QD size and cavity length were optimized using PICS3D simulation software to achieve a high-performance QD-embedded VCSEL. A comparative analysis between VCSEL traditional well conducted, results demonstrated that achieved higher stimulated recombination radiation internal efficiency. threshold current reduced 4 mA, corresponding density of 5.1 kA/cm², output power reached 4.4 mW at an injection 20 mA. stable single-longitudinal-mode also wavelength 436 nm. proposed novel active-region validated through theoretical simulations, confirming its feasibility. This study provides guidance key epitaxial structural parameters for preparing materials.

Language: Английский

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Reversible Thermotropic Energy‐Transfer Dual‐Mode Luminescence in Perovskite Nanocrystals for Advanced Dynamic Anti‐Counterfeiting Applications

Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 19, 2025

Abstract The intrinsic instability of metal halide perovskites (MHPs) renders them highly susceptible to environmental factors, thereby posing significant challenges for their broad application. However, this sensitivity also imparts unique properties that are particularly advantageous anti‐counterfeiting applications. Herein, blue and green dual‐mode luminescent CsPbBr₃ nanocrystals devised by employing a confined growth strategy. By in situ within molecular sieves (MS), composite CsPbBr₃@MS@CsPbBr₃/Cs₄PbBr₆ synthesized with strongly‐confined core shell structure. Leveraging the phonon disturbance effect, these exhibit reversible thermotropic emission color transition between over wide temperature range −196–100 °C. This is attributed variation energy transfer (ET) efficiency nanocrystals. Notably, thermal fluorescence intensity ratio (FIR) at I₅₂₅nm/I₄₆₀nm reaches 0.19 K⁻¹ 100 °C, which significantly higher than traditional rare‐earth fluorescent thermosensitive materials. remarkable highlights high responsiveness changes. Nanocrystal labels further fabricated display temperature‐driven spectral transitions, enabling dynamic functionality. innovative approach offers novel concept design materials devices.

Language: Английский

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