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Efficient Photon Extraction in Top-Emission Organic Light-Emitting Devices Based on Ampicillin Microstructures.
Dong Hyun Kim1,2,3, Chang Min Lee1,2,3, Amjad Islam1,2,3
1Division of Display and Semiconductor Physics, Display Convergence, College of Science and Technology, Korea University Sejong Campus, 2511 Sejong-ro, Sejong City, 30019, Republic of Korea.
Advanced Materials (Deerfield Beach, Fla.)
|June 14, 2022
Summary
Ampicillin microstructures (Amp-MSs) boost top-emission organic light-emitting device (TEOLED) efficiency through dual-phase properties. This innovation enhances light outcoupling and charge balance, achieving record external quantum efficiency.
Area of Science:
- Materials Science
- Optoelectronics
- Solid State Physics
Background:
- Organic light-emitting devices (OLEDs) require advanced materials to improve efficiency.
- Top-emission OLEDs (TEOLEDs) present unique challenges in light outcoupling and charge balance.
Purpose of the Study:
- To enhance TEOLED efficiency using ampicillin microstructures (Amp-MSs).
- To investigate the dual-phase properties of Amp-MSs for photoluminescence (PL) and electroluminescence (EL) induction.
- To optimize charge balance and reduce leakage current via Fermi level (EF) alignment.
Main Methods:
- Introduction of dual-phase ampicillin microstructures (α-/β-phase) into TEOLEDs.
- Fermi level alignment engineering for charge balance.
- Analysis of optical scattering and radiative energy transfer mechanisms.
- Deconvolution of electroluminescence (EL) intensities to quantify contributions.
Main Results:
- Amp-MSs induced significant PL and EL, enhancing device efficiency.
- Achieved record external quantum efficiency (EQE): max 68.7% (spectroradiometer) and 44.8% (integrating sphere).
- Demonstrated a wider color gamut (118%) due to spectral redshift from J-aggregation.
- Quantified Amp-MSs contributions: 17.0% (optical scattering), 9.1% (PL), and 4.6% (EL).
Conclusions:
- Amp-MSs effectively enhance TEOLED efficiency through multiple mechanisms.
- The proposed TEOLED design surpasses existing frameworks in device performance.
- Dual-phase Amp-MSs offer a promising strategy for next-generation optoelectronic devices.
