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

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8 Author(s)
Tan, Zhanao ; Dept. of Eng. Sci. & Mech., Pennsylvania State Univ., University Park, PA ; Hedrick, Brittany ; Fan Zhang ; Zhu, Ting
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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/m2 under a bias of 9.4 V.

Published in:

Photonics Technology Letters, IEEE  (Volume:20 ,  Issue: 23 )