4.8 Article

White Light-Emitting Diodes Based on Ultrasmall CdSe Nanocrystal Electroluminescence

Journal

NANO LETTERS
Volume 10, Issue 2, Pages 573-576

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/nl903515g

Keywords

Ultrasmall nanocrystal; electroluminescence; white-light; LED

Funding

  1. Vanderbilt University Discovery
  2. Oak Ridge National Laboratory's Center for Nanophase Materials Sciences
  3. Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy

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We report white light-emitting diodes fabricated with ultrasmall CdSe nanocrystals, which demonstrate electroluminescence from a size of nanocrystals (<2 nm) previously thought to be unattainable. These LEDs have excellent color characteristics, defined by their pure white CIE color coordinates (0.333, 0.333), correlated color temperatures of 5461-6007 K, and color rendering indexes as high as 96.6. The effect of high voltage on the trap states responsible for the white emission is also described.

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