Efficient Photon Extraction in Top-Emission Organic Light-Emitting Devices Based on Ampicillin Microstructures

Efficient Photon Extraction in Top-Emission Organic Light-Emitting Devices Based on Ampicillin Microstructures

© 2022 Wiley-VCH GmbH.

Détails bibliographiques
Publié dans:Advanced materials (Deerfield Beach, Fla.). - 1998. - 34(2022), 32 vom: 28. Aug., Seite e2202866
Auteur principal: Kim, Dong Hyun (Auteur)
Autres auteurs: Lee, Chang Min, Islam, Amjad, Choi, Dong Hyun, Jeong, Geon-Woo, Kim, Tae Wook, Cho, Hyun Woo, Kim, Yeong Beom, Shah, Syed Hamad Ullah, Park, Min Jae, Kim, Chul Hoon, Lee, Hyun Jae, Lee, Jae Woo, Bang, Seain, Bae, Tae-Sung, Park, Jong Bae, Yu, Seung Min, Kang, Yong-Cheol, Park, Juyun, Park, Myeongkee, Jeong, Yeonsu, Lee, Sang Geul, Jin, Jong Sung, Kim, Kyoung-Ho, Sujak, Muhammad, Moon, Surk-Suik, Park, Sanghyuk, Song, Myung Kwan, Kim, Chang-Su, Ryu, Seung Yoon
Format: Article en ligne
Langue:English
Publié: 2022
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
Description
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
Description:Date Revised 10.08.2022
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202202866