Metal–Organic Framework‐Assisted Rational Design of Multicolor Solid‐State Fluorescent Carbon Nanodots and Its Application for LEDs

Laser & Photonics Review, Journal Year: 2023, Volume and Issue: 18(3)

Published: Dec. 18, 2023

Abstract Carbon nanodots (CDs) are a new type of carbon‐based fluorescent nanomaterials, but they limited in many applications due to the inherent fluorescence weakening and quenching problems suffered solid state. Herein, ZIF‐8, class metal–organic framework (MOF) is employed as matrix immobilize CDs, resulting strong luminescence CDs achieved The as‐synthesized CDs@ZIF‐8 powders possess blue, green, red emissions with main emission at ≈495, 528, 600 nm, corresponding photoluminescence quantum yields (PLQYs) high 25.89%, 52.24%, 15.42%, respectively. It found that encapsulation ZIF‐8 will increase excitation dependence product fluorescence, which may be attributed carrier effect some surface defects or functional groups change introduced by ZIF‐8. In addition, result charge transfer. Importantly, prepared phosphors present promising application fabrication monochromatic light‐emitting diodes (LEDs). synthesis design expected provide technical support for future solid‐state preparation applications.

Language: Английский

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Intermediate aminophenol enables hectogram-scale synthesis of highly bright red carbon quantum dots under ambient conditions

Chemical Science, Journal Year: 2024, Volume and Issue: 15(25), P. 9806 - 9813

Published: Jan. 1, 2024

A facile, safe and high-yield synthesis of red-emitting carbon dots (R-C-dots) revealed the formation mechanism from precursor to R-C-dots.

Language: Английский

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Effects of Multifunctional Cerium-Doped Carbon Dots on Photosynthetic Capacity and Nutritional Quality of Lettuce

Environmental Science Nano, Journal Year: 2024, Volume and Issue: 11(7), P. 3137 - 3149

Published: Jan. 1, 2024

Cerium-doped carbon dots (Ce-CDs) have been prepared using a one-pot hydrothermal method and employed as foliar fertilizer, which can improve the nutritional quality of lettuce, promote photosynthetic capacity plants.

Language: Английский

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Binary Host‐induced Exciplex Enabled High Color‐Rendering Index of 94 for Carbon Quantum Dot‐Based White Light‐Emitting Diodes

Advanced Science, Journal Year: 2024, Volume and Issue: 11(30)

Published: June 13, 2024

Abstract White light‐emitting diodes (WLEDs) with high color‐rendering index (CRI, >90) are important for backlight displays and solid‐state lighting applications. Although the well‐developed colloidal quantum dots (QDs) based on heavy metals such as cadmium lead promising candidates WLEDs, low CRI still remains a significant limitation. In addition, severe toxicity of greatly limits their widespread use. Herein, study demonstrates low‐cost environmentally friendly carbon (CQDs)‐based WLEDs that exhibit 94.33, surpassing conventional cadmium/lead‐containing QD‐based WLEDs. This achievement is attained through employment binary host‐induced exciplex strategy. The hole/electron mobility suitable energy levels donor acceptor give rise to broadband orange–yellow emission stemming from exciplex. As host, capable contributing blue components while efficiently mitigating aggregation‐induced quenching CQDs. Meanwhile, CQDs effectively address deep‐red gap, enabling realization CQDs‐based CRI. These also remarkably turn‐on voltage 2.8 V, maximum luminance exceeding 2000 cd m − 2 , correlated color temperature 4976 K, Commission Internationale de l'Eclairage coordinates (0.34, 0.32).

Language: Английский

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Rational Synthesis of Single-Component White-Light-Emitting Carbon Nanodots for Warm White LEDs with a High Color Rendering Index of 95.4

ACS Applied Nano Materials, Journal Year: 2024, Volume and Issue: 7(17), P. 20889 - 20896

Published: Sept. 3, 2024

Phosphor-converted white-emitting diodes (WLEDs) have become a strong competitor for the next generation of solid-state lighting sources, and carbon nanodots (CNDs) are go-to choice nanomaterial white phosphor development thanks to their superior properties. However, it is still challenging prepare single-component white-light-emitting (SCWLE) CNDs that most promising CNDs-based WLED development. In this report, rational approach preparation SCWLE was reported further advance current field. Specifically, were rationally prepared by exploiting one-pot synthesis in which precursors red, green, blue situ treated under an identical reaction. Taking advantage CNDs, WLEDs emitting warm light with CIE coordinate (0.39, 0.37), CCT 3732K, extremely high CRI 95.4 successfully constructed. Furthermore, device also demonstrated robust photoluminescence stability different operating conditions, highlighting practical application potential technology.

Language: Английский

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