Combination of carbon dot and polymer dot phosphors for white light-emitting diodes

Sun, Chun; Zhang, Yu; Sun, Kai; Reckmeier, Claas J.; Zhang, Tieqiang; Zhang, Xiaoyu; Zhao, Jianlin; Wu, Changfeng; Yu, William W.; Rogach, Andrey L.

doi:10.1039/c5nr03014e

Cited by 185 publications

(122 citation statements)

References 42 publications

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“…This strict excitation wavelength independence is distinctive in our CDs. It gives the easy handling and design of multicolor applications, and the existing use of traditional quantum dots (such as Cd chalcogenides) can be easily switched to CDs 31,32 to reduce the synthesis complexity and production cost, and to eliminate the biological and ecological toxicity (from the heavy metals of Cd, Cu, Pb, etc .). 33,34 …”

Section: Resultsmentioning

confidence: 99%

Excitation wavelength independent visible color emission of carbon dots

et al. 2017

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Carbon dots (CDs) usually emit a strong blue light and excitation wavelength dependent long wavelength lights. This significantly limits their applications because one has to use a series of different excitation light sources to get different colors and the long wavelength emissions are usually very weak. We found that one type of CDs synthesized from p-phenylenediamine could emit various long wavelength lights (green to red) independent of the excitation wavelength when dispersed in different solvents. The photoluminescence quantum yields of the same CDs were 10–35% in different solvents for different color emissions. Based on this solvent-color effect, we further mixed the same CDs with different polymers to form solid CD films for various color emissions, and these film emissions were also excitation wavelength independent. Multicolor LEDs were demonstrated with the same CDs in solution and solid film states for color displays.

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Section: Resultsmentioning

confidence: 99%

Excitation wavelength independent visible color emission of carbon dots

et al. 2017

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“…Additionally, the white light emissions were achieved by mixing a multilayer of green and red perovskite phosphors with blue InGaN chips, which suffered from the low color rendering index (CRI) and high correlated color temperature (CCT) that varied with working voltage and phosphor coating thickness. 26,27 Very recently, single-phase white materials have been reported; these materials emit white light through doping perovskites. 28–30 Nevertheless, these processes are generally complex.…”

Section: Introductionmentioning

confidence: 99%

Efficient and Stable CsPb(Br/I)₃@Anthracene Composites for White Light-Emitting Devices

Shen

Sun

Bai

et al. 2018

ACS Appl. Mater. Interfaces

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Inorganic perovskite quantum dots bear many unique properties that make them potential candidates for optoelectronic applications, including color display and lighting. However, the white emission with inorganic perovskite quantum dots has rarely been realized due to the anion-exchange reaction. Here, we proposed a one-pot preparation to fabricate inorganic perovskite quantum dot-based white light-emitting composites by introducing anthracene as a blue emission component. The as-prepared white light-emitting composite exhibited a photoluminescence quantum yield of 41.9%. By combining CsPb(Br/I)3@anthracene composites with UV light-emitting device (LED) chips, white light-emitting devices with a color rendering index of 90 were realized with tunable color temperature from warm white to cool white. These results can promote the application of inorganic perovskite quantum dots in the field of white LEDs.

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“…Research regarding QDs as color conversion in WLEDs has been particularly high-lighted, because of their tunable emission over the entire visible region, high QY, and facile fabrication [31–38]. …”

Section: Introductionmentioning

confidence: 99%

Enhanced bandwidth of white light communication using nanomaterial phosphors

et al. 2018

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The bandwidth of white light emitting diodes (WLEDs) is an important factor that affects most of the system performances in visible light communication (VLC). It is mainly limited by the down-conversion phosphors. We propose in this paper to employ nanomaterial phosphors with short fluorescence lifetime and high quantum yield in VLC. The white-emitting device of bandwidth-based lifetime was fabricated by using several kinds of nanophosphors with different fluorescence lifetimes. Moreover, we proposed two theoretical models to analyze the factors that affect bandwidth. Compared with the commercial YAG-based WLEDs, the bandwidth of nanophosphor-based WLEDs can be improved over three times and close to the blue excitation sources. Our study indicates that nanophosphors can become promising fluorescent materials in VLC, and provides a new direction for developing wide-bandwidth VLC systems.

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Combination of carbon dot and polymer dot phosphors for white light-emitting diodes

Cited by 185 publications

References 42 publications

Excitation wavelength independent visible color emission of carbon dots

Excitation wavelength independent visible color emission of carbon dots

Efficient and Stable CsPb(Br/I)₃@Anthracene Composites for White Light-Emitting Devices

Enhanced bandwidth of white light communication using nanomaterial phosphors

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Combination of carbon dot and polymer dot phosphors for white light-emitting diodes

Cited by 185 publications

References 42 publications

Excitation wavelength independent visible color emission of carbon dots

Excitation wavelength independent visible color emission of carbon dots

Efficient and Stable CsPb(Br/I)3@Anthracene Composites for White Light-Emitting Devices

Enhanced bandwidth of white light communication using nanomaterial phosphors

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Product

Resources

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Efficient and Stable CsPb(Br/I)₃@Anthracene Composites for White Light-Emitting Devices