Stable binary complementary white light-emitting diodes based on quantum-dot/polymer-bilayer structures

Zhanao Tan, Brittany Hedrick, Fan Zhang, Ting Zhu, Jian Xu, Ron H. Henderson, Jerzy Ruzyllo, Andrew Y. Wang

Research output: Contribution to journalArticle

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Abstract

A binary complementary white light-emitting diode (LED) was designed and fabricated by employing a colloidal quantum-dot (QD)/polymer-bilayer configuration in the device active region. Stable white electroluminescence is observed from the cumulative emission of the yellow-emitting CdSe-ZnS core-shell QDs and blue-emitting poly(N,N'-bis (4-butylphenyl)-N,N'-bis(phenyl)benzidine) (Poly-TPD) molecules. The white chromaticity of the LED output can be tailored by varying the respective thicknesses of the constituent emissive layers; whereas the emission color exhibits little dependence on the applied bias over a wide voltage range. The maximum luminance of the device reaches 2600 cd/m 2 under a bias of 9.4 V.

Original languageEnglish (US)
Pages (from-to)1998-2000
Number of pages3
JournalIEEE Photonics Technology Letters
Volume20
Issue number23
DOIs
StatePublished - Dec 1 2008

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All Science Journal Classification (ASJC) codes

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

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