Nano Lett., 7 (12), 3803 -3807, 2007. 10.1021/nl072370s S1530-6984(07)02370-3
Web Release Date: November 2, 2007

Copyright © 2007 American Chemical Society

Bright and Color-Saturated Emission from Blue Light-Emitting Diodes Based on Solution-Processed Colloidal Nanocrystal Quantum Dots

Zhanao Tan, Fan Zhang, Ting Zhu, and Jian Xu*

Department of Engineering Science and Mechanics, Penn State University, University Park, Pennsylvania 16802

Andrew Y. Wang,* John D. Dixon, and Linsong Li

Ocean NanoTech LLC., Fayetteville, Arkansas 72702-2168

Qi Zhang and Suzanne E. Mohney

Material Science and Engineering Department, Penn State University, University Park, Pennsylvania 16802

Jerzy Ruzyllo

Department of Electrical Engineering, Penn State University, University Park, Pennsylvania 16802

Received September 14, 2007

Revised October 23, 2007

Abstract:

We report a multilayer solution-processed blue light-emitting diode based on colloidal core/shell CdS/ZnS nanocrystal quantum dots (QDs). At a low-operating voltage of 5.5 V, the device emits spectrally pure blue radiation at 460 nm with a narrow full-width-at-half-maximum bandwidth of 20 nm and high brightness up to 1600 cd/m2. Broad-band, long-wavelength emission from the polymer components and deep traps in the QDs are minimized to less than 5% of the total emission.

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