High color rendering index white light emitting diodes fabricated from a combination of carbon dots and zinc copper indium sulfide quantum dots

Chun Sun; Yu Zhang; Yu Wang; Wenyan Liu; Sergii Kalytchuk; Stephen V. Kershaw; Tieqiang Zhang; Xiaoyu Zhang; Jun Zhao; William W. Yu; Andrey L. Rogach

doi:10.1063/1.4886415

High color rendering index white light emitting diodes fabricated from a combination of carbon dots and zinc copper indium sulfide quantum dots

Chun Sun, Yu Zhang, Yu Wang, Wenyan Liu, Sergii Kalytchuk, Stephen V. Kershaw, Tieqiang Zhang, Xiaoyu Zhang, Jun Zhao, William W. Yu, Andrey L. Rogach

Centre for Functional Photonics

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

102 Citations (Scopus)

63 Downloads (CityUHK Scholars)

Abstract

In a line with most recent trends in developing non-toxic fluorescent nanomaterials, we combined blue emissive carbon dots with green and red emissive zinc copper indium sulfide (ZCIS) core/shell quantum dots (QDs) to achieve white light-emitting diodes (WLEDs) with a high color rendering index of 93. This indicates that ZCIS QDs, with their broad emission bands, can be employed to effectively make up the emission of carbon dots in the yellow and red regions to produce WLEDs in the wide region of color temperature by tuning the volume ratio of these constituting luminophores. Their electroluminescence characteristics including color rendering index, Commission Internationale de l'Eclairage (CIE) color coordinates, and color temperatures were evaluated as a function of forward current. The CIE-1931 chromaticity coordinates of the as-prepared WLEDs, exhibiting good stability, were slightly shifted from (0.321, 0.312) at 10 mA to (0.351, 0.322) at 30 mA, which was mainly caused by the different thermal quenching coefficients of carbon dots and ZCIS QDs. © 2014 AIP Publishing LLC.

Original language	English
Article number	261106
Journal	Applied Physics Letters
Volume	104
Issue number	26
DOIs	https://doi.org/10.1063/1.4886415
Publication status	Published - 30 Jun 2014

Publisher's Copyright Statement

COPYRIGHT TERMS OF DEPOSITED FINAL PUBLISHED VERSION FILE: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Chun Sun, Yu Zhang, Yu Wang, Wenyan Liu, Sergii Kalytchuk, Stephen V. Kershaw, Tieqiang Zhang, Xiaoyu Zhang, Jun Zhao, William W. Yu, and Andrey L. Rogach , "High color rendering index white light emitting diodes fabricated from a combination of carbon dots and zinc copper indium sulfide quantum dots", Appl. Phys. Lett. 104, 261106 (2014) and may be found at https://doi.org/10.1063/1.4886415.

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title = "High color rendering index white light emitting diodes fabricated from a combination of carbon dots and zinc copper indium sulfide quantum dots",

abstract = "In a line with most recent trends in developing non-toxic fluorescent nanomaterials, we combined blue emissive carbon dots with green and red emissive zinc copper indium sulfide (ZCIS) core/shell quantum dots (QDs) to achieve white light-emitting diodes (WLEDs) with a high color rendering index of 93. This indicates that ZCIS QDs, with their broad emission bands, can be employed to effectively make up the emission of carbon dots in the yellow and red regions to produce WLEDs in the wide region of color temperature by tuning the volume ratio of these constituting luminophores. Their electroluminescence characteristics including color rendering index, Commission Internationale de l'Eclairage (CIE) color coordinates, and color temperatures were evaluated as a function of forward current. The CIE-1931 chromaticity coordinates of the as-prepared WLEDs, exhibiting good stability, were slightly shifted from (0.321, 0.312) at 10 mA to (0.351, 0.322) at 30 mA, which was mainly caused by the different thermal quenching coefficients of carbon dots and ZCIS QDs. {\textcopyright} 2014 AIP Publishing LLC.",

author = "Chun Sun and Yu Zhang and Yu Wang and Wenyan Liu and Sergii Kalytchuk and Kershaw, {Stephen V.} and Tieqiang Zhang and Xiaoyu Zhang and Jun Zhao and Yu, {William W.} and Rogach, {Andrey L.}",

year = "2014",

month = jun,

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doi = "10.1063/1.4886415",

language = "English",

volume = "104",

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T1 - High color rendering index white light emitting diodes fabricated from a combination of carbon dots and zinc copper indium sulfide quantum dots

AU - Sun, Chun

AU - Zhang, Yu

AU - Wang, Yu

AU - Liu, Wenyan

AU - Kalytchuk, Sergii

AU - Kershaw, Stephen V.

AU - Zhang, Tieqiang

AU - Zhang, Xiaoyu

AU - Zhao, Jun

AU - Yu, William W.

AU - Rogach, Andrey L.

PY - 2014/6/30

Y1 - 2014/6/30

N2 - In a line with most recent trends in developing non-toxic fluorescent nanomaterials, we combined blue emissive carbon dots with green and red emissive zinc copper indium sulfide (ZCIS) core/shell quantum dots (QDs) to achieve white light-emitting diodes (WLEDs) with a high color rendering index of 93. This indicates that ZCIS QDs, with their broad emission bands, can be employed to effectively make up the emission of carbon dots in the yellow and red regions to produce WLEDs in the wide region of color temperature by tuning the volume ratio of these constituting luminophores. Their electroluminescence characteristics including color rendering index, Commission Internationale de l'Eclairage (CIE) color coordinates, and color temperatures were evaluated as a function of forward current. The CIE-1931 chromaticity coordinates of the as-prepared WLEDs, exhibiting good stability, were slightly shifted from (0.321, 0.312) at 10 mA to (0.351, 0.322) at 30 mA, which was mainly caused by the different thermal quenching coefficients of carbon dots and ZCIS QDs. © 2014 AIP Publishing LLC.

AB - In a line with most recent trends in developing non-toxic fluorescent nanomaterials, we combined blue emissive carbon dots with green and red emissive zinc copper indium sulfide (ZCIS) core/shell quantum dots (QDs) to achieve white light-emitting diodes (WLEDs) with a high color rendering index of 93. This indicates that ZCIS QDs, with their broad emission bands, can be employed to effectively make up the emission of carbon dots in the yellow and red regions to produce WLEDs in the wide region of color temperature by tuning the volume ratio of these constituting luminophores. Their electroluminescence characteristics including color rendering index, Commission Internationale de l'Eclairage (CIE) color coordinates, and color temperatures were evaluated as a function of forward current. The CIE-1931 chromaticity coordinates of the as-prepared WLEDs, exhibiting good stability, were slightly shifted from (0.321, 0.312) at 10 mA to (0.351, 0.322) at 30 mA, which was mainly caused by the different thermal quenching coefficients of carbon dots and ZCIS QDs. © 2014 AIP Publishing LLC.

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DO - 10.1063/1.4886415

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JO - Applied Physics Letters

JF - Applied Physics Letters

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High color rendering index white light emitting diodes fabricated from a combination of carbon dots and zinc copper indium sulfide quantum dots

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