Efficient Photon Extraction in Top-Emission Organic Light-Emitting Devices Based on Ampicillin Microstructures
© 2022 Wiley-VCH GmbH.
Publié dans: | Advanced materials (Deerfield Beach, Fla.). - 1998. - 34(2022), 32 vom: 28. Aug., Seite e2202866 |
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Auteur principal: | |
Autres auteurs: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article en ligne |
Langue: | English |
Publié: |
2022
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Accès à la collection: | Advanced materials (Deerfield Beach, Fla.) |
Sujets: | Journal Article J-/H-aggregated excitons micro-photoluminescence microcavity ampicillin-microstructure multiple scattering top-emission organic light-emitting diodes wave-guided mode |
Résumé: | © 2022 Wiley-VCH GmbH. The desire to enhance the efficiency of organic light-emitting devices (OLEDs) has driven to the investigation of advanced materials with fascinating properties. In this work, the efficiency of top-emission OLEDs (TEOLEDs) is enhanced by introducing ampicillin microstructures (Amp-MSs) with dual phases (α-/β-phase) that induce photoluminescence (PL) and electroluminescence (EL). Moreover, Amp-MSs can adjust the charge balance by Fermi level (EF ) alignment, thereby decreasing the leakage current. The decrease in the wave-guided modes can enhance the light outcoupling through optical scattering. The resulting TEOLED demonstrates a record-high external quantum efficiency (EQE) (maximum: 68.7% and average: 63.4% at spectroradiometer; maximum: 44.8% and average: 42.6% at integrating sphere) with a wider color gamut (118%) owing to the redshift of the spectrum by J-aggregation. Deconvolution of the EL intensities is performed to clarify the contribution of Amp-MSs to the device EQE enhancement (optical scattering by Amp-MSs: 17.0%, PL by radiative energy transfer: 9.1%, and EL by J-aggregated excitons: 4.6%). The proposed TEOLED outperforms the existing frameworks in terms of device efficiency |
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Description: | Date Revised 10.08.2022 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
ISSN: | 1521-4095 |
DOI: | 10.1002/adma.202202866 |