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. 2022 Aug;34(32):e2202866.
doi: 10.1002/adma.202202866. Epub 2022 Jul 11.

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

Dong Hyun Kim  1   2   3 , Chang Min Lee  1   2   3 , Amjad Islam  1   2   3 , Dong Hyun Choi  1   2   3 , Geon-Woo Jeong  1   2   3 , Tae Wook Kim  1   2   3 , Hyun Woo Cho  1   2   3 , Yeong Beom Kim  1   2   3 , Syed Hamad Ullah Shah  1   2   3 , Min Jae Park  1   2   3 , Chul Hoon Kim  4 , Hyun Jae Lee  4 , Jae Woo Lee  5 , Seain Bang  5 , Tae-Sung Bae  6 , Jong Bae Park  6 , Seung Min Yu  6 , Yong-Cheol Kang  7 , Juyun Park  7 , Myeongkee Park  7 , Yeonsu Jeong  7 , Sang Geul Lee  8 , Jong Sung Jin  9 , Kyoung-Ho Kim  10 , Muhammad Sujak  10 , Surk-Suik Moon  11 , Sanghyuk Park  11 , Myung Kwan Song  12 , Chang-Su Kim  12 , Seung Yoon Ryu  1   2   3
Affiliations

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

Dong Hyun Kim et al. Adv Mater. 2022 Aug.

Abstract

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.

Keywords: J-/H-aggregated excitons; micro-photoluminescence; microcavity ampicillin-microstructure; multiple scattering; top-emission organic light-emitting diodes; wave-guided mode.

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