Employing heavy metal-free colloidal quantum dots in solution-processed white light-emitting diodes

Yu Zhang, Chuang Xie, Huaipeng Su, Jie Liu, Shawn Pickering, Yongqiang Wang, William W. Yu, Jingkang Wang, Yiding Wang, Jong In Hahm, Nicholas Dellas, Suzanne E. Mohney, Jian Xu

Research output: Contribution to journalArticle

161 Citations (Scopus)

Abstract

We report in this communication the design and fabrication of solution-processed white light-emitting diodes (LEDs) containing a bilayer of heavy metal-free colloidal quantum dots (QDs) and polymer in the device active region. White electroluminescence was obtained in the LEDs by mixing the red emission of ZnCuInS/ZnS core/shell QDs and the blue-green emission of poly(N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)benzidine). A high color rendering index of 92 was achieved as compared to a 5310 K blackbody reference by virtue of broadband emission of the QDs. The Commission Internationale de l'Eclairage chromaticity coordinates of the white LED output exhibit a distinctive bias dependence. Finally, aging of the white LEDs was studied, revealing the difference between the photochemical stabilities of the QDs and polymer molecules and the consequent effect on the color evolution of the LEDs.

Original languageEnglish (US)
Pages (from-to)329-332
Number of pages4
JournalNano letters
Volume11
Issue number2
DOIs
StatePublished - Feb 9 2011

Fingerprint

heavy metals
Heavy Metals
Semiconductor quantum dots
Heavy metals
Light emitting diodes
light emitting diodes
quantum dots
Polymers
Color
color
polymers
Electroluminescence
electroluminescence
Aging of materials
communication
broadband
Fabrication
fabrication
Molecules
output

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Zhang, Yu ; Xie, Chuang ; Su, Huaipeng ; Liu, Jie ; Pickering, Shawn ; Wang, Yongqiang ; Yu, William W. ; Wang, Jingkang ; Wang, Yiding ; Hahm, Jong In ; Dellas, Nicholas ; Mohney, Suzanne E. ; Xu, Jian. / Employing heavy metal-free colloidal quantum dots in solution-processed white light-emitting diodes. In: Nano letters. 2011 ; Vol. 11, No. 2. pp. 329-332.
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abstract = "We report in this communication the design and fabrication of solution-processed white light-emitting diodes (LEDs) containing a bilayer of heavy metal-free colloidal quantum dots (QDs) and polymer in the device active region. White electroluminescence was obtained in the LEDs by mixing the red emission of ZnCuInS/ZnS core/shell QDs and the blue-green emission of poly(N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)benzidine). A high color rendering index of 92 was achieved as compared to a 5310 K blackbody reference by virtue of broadband emission of the QDs. The Commission Internationale de l'Eclairage chromaticity coordinates of the white LED output exhibit a distinctive bias dependence. Finally, aging of the white LEDs was studied, revealing the difference between the photochemical stabilities of the QDs and polymer molecules and the consequent effect on the color evolution of the LEDs.",
author = "Yu Zhang and Chuang Xie and Huaipeng Su and Jie Liu and Shawn Pickering and Yongqiang Wang and Yu, {William W.} and Jingkang Wang and Yiding Wang and Hahm, {Jong In} and Nicholas Dellas and Mohney, {Suzanne E.} and Jian Xu",
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Zhang, Y, Xie, C, Su, H, Liu, J, Pickering, S, Wang, Y, Yu, WW, Wang, J, Wang, Y, Hahm, JI, Dellas, N, Mohney, SE & Xu, J 2011, 'Employing heavy metal-free colloidal quantum dots in solution-processed white light-emitting diodes', Nano letters, vol. 11, no. 2, pp. 329-332. https://doi.org/10.1021/nl1021442

Employing heavy metal-free colloidal quantum dots in solution-processed white light-emitting diodes. / Zhang, Yu; Xie, Chuang; Su, Huaipeng; Liu, Jie; Pickering, Shawn; Wang, Yongqiang; Yu, William W.; Wang, Jingkang; Wang, Yiding; Hahm, Jong In; Dellas, Nicholas; Mohney, Suzanne E.; Xu, Jian.

In: Nano letters, Vol. 11, No. 2, 09.02.2011, p. 329-332.

Research output: Contribution to journalArticle

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AU - Pickering, Shawn

AU - Wang, Yongqiang

AU - Yu, William W.

AU - Wang, Jingkang

AU - Wang, Yiding

AU - Hahm, Jong In

AU - Dellas, Nicholas

AU - Mohney, Suzanne E.

AU - Xu, Jian

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