Bright, multicoloured light-emitting diodes based on quantum dots

Qingjiang Sun, Y. Andrew Wang, Lin Song Li, Daoyuan Wang, Ting Zhu, Jian Xu, Chunhe Yang, Yongfang Li

Research output: Contribution to journalArticlepeer-review

960 Scopus citations

Abstract

Quantum-dot-based LEDs are characterized by pure and saturated emission colours with narrow bandwidth, and their emission wavelength is easily tuned by changing the size of the quantum dots. However, the brightness, efficiency and lifetime of LEDs need to be improved to meet the requirements of commercialization in the near future. Here, we report red, orange, yellow and green LEDs with maximum luminance values of 9,064, 3,200, 4,470 and 3,700cdm2, respectively, the highest values reported so far. Solution-processable core-shell quantum dots with a CdSe core and a ZnS or CdSZnS shell were used as emissive layers in the devices. By optimizing the thicknesses of the constituent layers of the devices, we were able to develop quantum-dot-based LEDs with improved electroluminescent efficiency (1.1-2.8cdA1), low turn-on voltages (3-4V) and long operation lifetimes. These findings suggest that such quantum-dot-based LEDs will be promising for use in flat-panel displays.

Original languageEnglish (US)
Pages (from-to)717-722
Number of pages6
JournalNature Photonics
Volume1
Issue number12
DOIs
StatePublished - Dec 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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