Solid-State Carbon Dots-Based White Light-Emitting Diodes With Ultrahigh Color Rendering Index and Good Thermal Stability

Yin, Luqiao; Yan, Yuxian; Guo, Huazhang; Wang, Liang; Xiu, Huixin; Zhang, Jianhua

doi:10.1109/ted.2021.3094495

Cited by 7 publications

(1 citation statement)

References 53 publications

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“…Generally, WLEDs are gained by combining a blue LED chip and yellow phosphor. However, whatever the ratio regulation of Y-CQDs, the CIE chromaticity coordinate of building WLEDs deviated from the white light trajectory in our previous work (Figure S12). Meanwhile, these LEDs revealed an extraordinarily low CRI (<60).…”

Section: Resultscontrasting

confidence: 60%

One-Pot Synthesis of Orange Emissive Carbon Quantum Dots for All-Type High Color Rendering Index White Light-Emitting Diodes

Guo

Liu

Shen

et al. 2022

ACS Sustainable Chem. Eng.

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The challenges of toxicity and stability of traditional long-wavelength emitting luminescent materials undoubtedly restrain their widespread applications. Some remedial proposals do not fundamentally solve these problems. So, the development of new types of long-wavelength emitting luminescent materials has become a new trend. Herein, orange emissive carbon quantum dots (O-CQDs) are successfully prepared by a simple one-step solvothermal approach using 1-amino-2-naphthol hydrochloride and citric acid (CA). Interestingly, O-CQDs can always be achieved by the regulation of different reaction conditions (e.g., CA concentration, temperature, and reaction times), which is closely related to the fixed structure of O-CQDs inherited from the used precursor. An O-CQD displays its homogeneous size distribution with an average size of 2.5 nm and obtains a high-graphitoid sp 2 hybrid architecture. Impressively, O-CQDs exhibit remarkable photoluminescent (PL) properties, including excitation-independent behavior, thermostability, photostability, and the robust nonsolvatochromic effect, in different solvents due to their efficient π-conjugated system. These excellent properties lay the optical foundation of O-CQDs for the construction of high-performance white-light-emitting diode (WLED) devices. More importantly, O-CQDs are employed as a light regulator combined with yellow emissive CQDs to form the phosphor, and then CQD phosphorbased all-type WLEDs with a high color rendering index (CRI, ≥81) are realized. This work provides a new avenue for the exploration of low-cost, environment-friendly, and high-performance CQD phosphor-based all-type WLEDs using long-wavelength emitting CQDs as a light regulator.

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Section: Resultscontrasting

confidence: 60%