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Molding hemispherical microlens arrays on flexible substrates for highly efficient inverted quantum dot light emitting diodes

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Abstract

Highly efficient flexible red quantum-dot light-emitting diodes (QLEDs) are successfully fabricated by molding hexagonally close-packed hemispherical microlens arrays (MLAs) on the front side of poly(ethylene-terephthalate) (PET) substrates. Compared with the conventional device, the external quantum efficiency (EQE) of the MLA-containing QLED is increased by a factor of 64%, from 8.6% to 14.1%. And a record-maximum luminous efficiency of 24.8 lm W−1 is achieved at an applied voltage of 3.0 V after introducing the MLAs into the device. The emission distribution of the device is largely changed due to the introduction of MLAs, displaying an anisotropic and non-Lambertian profile, i.e., higher emission intensity at high viewing-angle directions in its emission pattern than the Lambertian distribution. However, the EL spectra and the color coordinates of the QLEDs are hardly affected by the introduction of microstructured MLAs.

Graphical abstract: Molding hemispherical microlens arrays on flexible substrates for highly efficient inverted quantum dot light emitting diodes

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Publication details

The article was received on 29 Mar 2017, accepted on 05 Jun 2017 and first published on 05 Jun 2017


Article type: Paper
DOI: 10.1039/C7TC01339F
Citation: J. Mater. Chem. C, 2017, Advance Article
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    Molding hemispherical microlens arrays on flexible substrates for highly efficient inverted quantum dot light emitting diodes

    R. Yu, F. Yin, X. Huang and W. Ji, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC01339F

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