Quantum dot light-emitting devices with electroluminescence tunable over the entire visible spectrum

Nano Lett. 2009 Jul;9(7):2532-6. doi: 10.1021/nl9002969.


Improvements in quantum dot light-emitting device (QD-LED) performance are achieved by the choice of organic charge transporting layers, by use of different colloidal QDs for the different parts of the visible spectrum, and by utilizing a recently demonstrated robust QD deposition method. Spectrally narrow electroluminescence of our QD-LEDs is tuned over the entire visible wavelength range from lambda = 460 nm (blue) to lambda = 650 nm (deep red). By printing close-packed monolayers of different QD types inside an identical QD-LED structure, we demonstrate that different color QD-LEDs with QDs of different chemistry can be fabricated on the same substrate. We discuss mechanisms responsible for efficiency increase for green (4-fold) and orange (30%) QD-LEDs as compared to previous reports and outline challenges associated with achieving high-efficiency blue QD-LEDs.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Cadmium / chemistry
  • Electrochemistry
  • Light
  • Luminescent Measurements* / instrumentation
  • Microscopy, Atomic Force
  • Quantum Dots*
  • Selenium / chemistry
  • Sulfur / chemistry
  • Surface Properties
  • Zinc / chemistry


  • Cadmium
  • Sulfur
  • Selenium
  • Zinc