Stable Binary Complementary White Light-Emitting Diodes Based on Quantum-Dot/Polymer-Bilayer Structures

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-shel...

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Bibliographic Details
Published in:IEEE photonics technology letters 2008-12, Vol.20 (23), p.1998-2000
Main Authors: Zhanao Tan, Hedrick, B., Fan Zhang, Ting Zhu, Jian Xu, Henderson, R.H., Ruzyllo, J., Wang, A.Y.
Format: Article
Language:English
Subjects:
Bias
Bilayer structure
Color
Devices
Electroluminescence
Emission
Light emitting diodes
Nanocomposites
Organic light emitting diodes
Polymer films
Quantum dots
quantum dots (QDs)
Robust stability
Semiconductor diodes
Semiconductor materials
Voltage
white light-emitting diodes (LEDs)
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Summary: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.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2008.2006278