High color rendering index trichromatic white and red LEDs prepared from silane-functionalized carbon dots

Wang, Yunfeng; Wang, Kai; Han, Zhengsheng; Yin, Zhengmao; Zhou, Chuanjian; Du, Fanglin; Zhou, Shuyun; Chen, Ping; Xie, Zheng

doi:10.1039/c7tc02297b

Cited by 63 publications

(49 citation statements)

References 71 publications

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“…The three silica/CDots composites exhibit similar FT−IR spectra (Figure S5, Supporting Information), indicating their similar chemical compositions. Typically, the absorbances at 3440 and 1659 cm −1 are assigned to the NH and CONH stretching vibration, respectively . The absorbance peak at 1700 cm −1 is ascribed to the stretching vibration of CO.…”

Section: Resultsmentioning

confidence: 90%

“…The UV–vis spectra, PL excitation, and PL emission spectra are taken along the horizontal and vertical dash lines in the corresponding excitation–emission matrix in Figure a–c are shown in Figure d–f. The absorption spectra of silica/CDots composites show the dominating bands at λ max ≈ 400, 470, and 470 nm for B‐silica/CDots to O‐silica/CDots, respectively, which can be assigned to the n–π* transition of CO . Specifically, the Y‐silica/CDots show absorption at 470 nm and the emission at 568 nm, which is very important in blue LED‐based white LED (WLED) applications.…”

Section: Resultsmentioning

confidence: 99%

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One‐Step Synthesis of Silica‐Coated Carbon Dots with Controllable Solid‐State Fluorescence for White Light‐Emitting Diodes

Zhan

Shang

Chen

et al. 2019

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Carbon dots (CDots)‐based solid‐state luminescent materials have important applications in light‐emitting devices owing to their outstanding optical properties. However, it still remains a challenge to develop multiple‐color‐emissive solid‐state CDots, due to the serious self‐quenching of the CDots in the aggregation or solid state. Herein, a one‐step synthesis of multiple‐color‐emissive solid‐state silica‐coated CDots (silica/CDots) composites by controlling CDots loading fraction and composite morphology to realize the adjustment of emitting color is reported. The emission of resultant silica/CDots composites shifts from blue to orange with the photoluminescence quantum yields of 57.9%, 34.3%, and 32.7% for blue, yellow, and orange emitting, respectively. Furthermore, the yellow emitting silica/CDots composites exhibit an excellent fluorescence thermal stability, and further have been applied to fabricate white‐light‐emitting devices with a high color rendering index of above 80.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

One‐Step Synthesis of Silica‐Coated Carbon Dots with Controllable Solid‐State Fluorescence for White Light‐Emitting Diodes

Zhan

Shang

Chen

et al. 2019

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“…Additionally, as one of tri‐primary colors, the red emissive CDs with QYs over 30% are barely reported . To the best of our knowledge, there are rare reports about polymerizable red emissive CDs …”

Section: Introductionmentioning

confidence: 98%

“…Hence, CDs have become a potential alternative of conventional fluorescent materials for applications in bioimaging, LEDs, energy conversion/storage, lasers, and optical limiters . Furthermore, researchers have prepared multicolor emissive CDs with high quantum yields (QYs) . Nevertheless, it is still a challenge to achieve the uniform dispersion and retain the indigenous properties of CDs in solid matrix.…”

Section: Introductionmentioning

confidence: 99%

Controllable Photoluminescent and Nonlinear Optical Properties of Polymerizable Carbon Dots and Their Arbitrary Copolymerized Gel Glasses

Ren

Sun

Wang

et al. 2018

Advanced Optical Materials

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In this work, an efficient method is developed to prepare silane‐functionalized red‐emissive carbon dots and carbon dots gel glasses with arbitrary loading fraction (0–100%). The as‐prepared materials possess strong photoluminescence and significant third‐order nonlinear optical performances. The optical properties can be tuned by either changing solvents and pH of the solution or adjusting the loading fractions of carbon dots in gel glasses. In particular, the photoluminescence of the carbon dots and their polymerized glasses can be linearly modulated from yellow to red emission by increasing the loading fraction of carbon dots or the polarity of solvent. It is also found that the chemical copolymerization leads to superior optical properties of gel glasses to that of the carbon dots solution, because the copolymerization endows stable immobilization of carbon dots in a rigid matrix. This study provides a feasible method to prepare optoelectronic hybrid materials and devices.

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“…For example, Wang et al have reported the polysiloxane functionalized orange luminescent carbon quantum dots. Recently, same group have also synthesized red emissive CQDs using silane‐functionalization . And, Ma et al have reported CQDs doped sodium borosilicate gel glasses as a red fluorescent material.…”

Section: Introductionmentioning

confidence: 93%

Synthesis of Longer‐Wavelength‐Emissive Carbon Quantum Dots for WLEDs and Investigation of Their Photoluminescence Properties

Kumari

Sahu

2018

ChemistrySelect

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The synthesis of highly fluorescent longer wavelength emissive carbon quantum dots (CQDs) is still a great challenge as well as an important issue, hindering its application in white light emitting diode (WLED). Herein, we have demonstrated a simple one‐pot solvothermal route for the synthesis of nitrogen and sulphur co‐doped CQDs using pyromellitic acid (PA), diethylenetriamine (DETA) and thiourea. At the specific molar ratio of the precursors, the orange color emissive CQDs (O‐CQDs) are synthesized and possess longer wavelength emission (611 nm). Additionally, O‐CQDs exhibits temperature and pH dependent photoluminescence (PL) properties. The O‐CQDs shows color correlated temperature (CCT) of 1745 K with high color purity of 98%. Simultaneously, as‐synthesized nitrogen and sulphur co‐doped CQDs shows concentration‐dependent PL properties, which display not only the brightness with stable orange color but also possess range of multicolour emission at different PL excitation. Solid host matrix of O‐CQDs is fabricated with poly‐(methyl methacrylate) (PMMA) chloroform solution and orange emissive property is investigated by wrapping the film over LED (InGaN) bulb. These studies will open up new opportunities to explore the tunable optical properties of carbon quantum dots and its applications in WLED devices.

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High color rendering index trichromatic white and red LEDs prepared from silane-functionalized carbon dots

Abstract: White LEDs with high CRI values can be produced by silane-functionalized carbon dots with green and red emission that have potential to be luminescence and encapsulation layers simultaneously.

Cited by 63 publications

References 71 publications

One‐Step Synthesis of Silica‐Coated Carbon Dots with Controllable Solid‐State Fluorescence for White Light‐Emitting Diodes

One‐Step Synthesis of Silica‐Coated Carbon Dots with Controllable Solid‐State Fluorescence for White Light‐Emitting Diodes

Controllable Photoluminescent and Nonlinear Optical Properties of Polymerizable Carbon Dots and Their Arbitrary Copolymerized Gel Glasses

Synthesis of Longer‐Wavelength‐Emissive Carbon Quantum Dots for WLEDs and Investigation of Their Photoluminescence Properties

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