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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Full‐Spectrum Carbon Dots Electroluminescent White Light‐Emitting Diodes with a Record Color Rendering Index of 94

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

Published: Feb. 21, 2025

Abstract Carbon dots (CDs) are emerging as promising nanomaterials for next‐generation white electroluminescent devices due to their high photoluminescence quantum yield (PLQY), broad emission spectrum, and compatibility with solution‐processed methods. However, current CD‐based light‐emitting diodes (CDs‐WLEDs) heavily rely on costly commercial host materials struggle low color rendering index (CRI). Herein, a “dual‐phase CDs emitter” strategy is introduced achieve full‐spectrum light emission, without employing materials. As proof of concept, synthesized broadband green nearly 100% PLQY. Spectroscopic structural analyses confirm that luminescence originates from molecular state emission. By combining these carbon dot organic frameworks capable dual blue red emissions, successfully produced record CRI 94 coordinates (0.32, 0.34). This approach provides cost‐effective efficient pathway developing high‐performance WLEDs exclusively CDs.

Language: Английский

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2-Aminoethanethiol Hydroiodate Additives Induced Phase Stability Improvement of CsPbI₃ Films for Use in Inorganic Perovskite Solar Cells

Langmuir, Journal Year: 2025, Volume and Issue: unknown

Published: March 4, 2025

This study investigates the role of 2-aminoethanethiol hydroiodate (2-AET·HI) additives in enhancing phase stability and photovoltaic performance CsPbI3 films for inorganic perovskite solar cells. The incorporation 2-AET·HI into precursor solution results a more uniform compact film morphology. X-ray diffraction (XRD) analysis reveals that 2-AET·HI-treated retain their black α-phase, even after 300 h at 25% RH ∼25 °C, whereas control samples show rapid transition to nonphotoactive δ-phase. improvement is reflected enhanced performance, with 2-AET·HI-modified devices exhibiting power conversion efficiency (PCE) 16.7%, compared 15.4% devices. Furthermore, display superior long-term stability, retaining 83% initial PCE 192 ambient conditions, stark contrast unmodified devices, which degrade rapidly.

Language: Английский

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Synthesis and Photoluminescence Properties of MgGa2O4:Dy3+ Phosphor under Different Wavelength Excitation

Journal of Electronic Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 2, 2025

Language: Английский

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Structure modification and luminescence regulation in new violet light excitable Sr(2-y)BayY4La4(SiO4)6O2:xEu2+ phosphors via cation substitution

Dalton Transactions, Journal Year: 2024, Volume and Issue: 53(44), P. 17989 - 18002

Published: Jan. 1, 2024

A series of violet light excitable Sr (2− y ) Ba Y 4 La (SiO 6 O 2 : x Eu 2+ phosphors with tunable luminescence for high-quality white LEDs was developed through cation regulation.

Language: Английский

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