ECE Seminar - Metal Halide Perovskites for Displays and Beyond
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Metal halide perovskites (MHPs) have emerged as promising light emitters for future display and optoelectronic applications due to their excellent color purity, tunable bandgaps, and high photoluminescence quantum yield. With the expanding scope of display applications, particularly in AR/VR devices, there is an increasing demand for light emitter that can deliver more vivid and accurate colors, meeting next-generation color standard of Rec. 2100. This presentation explores advanced strategies to improve the efficiency of perovskite light-emitting diodes (PeLEDs), which offer precise wavelength control and narrow FWHM. Additionally, the potential of MHPs in quantum technologies and lasers is examined, demonstrating their ability to fulfill the evolving demands of AR/VR, quantum applications, and other advanced systems.
To enhance PeLED luminescence efficiency, strategies such as doping guanidinium (GA) cations into formamidinium lead bromide (FAPbBr3) perovskite nanocrystals (PNCs) and overcoating with bromide-incorporated molecules are employed to stabilize PNCs and passivate defects . The use of a core/shell structure with benzylphosphonic acid in PNCs further boosts efficiency, brightness, and stability in PeLEDs. Additionally, hybrid tandem PeLEDs with optimized optical structures have achieved near-perfect charge balance and improved outcoupling efficiency, setting new standards in display technology. Finally, we employed surface-binding conjugated molecular multipods that strengthen the perovskite lattice and reduce dynamic disorder, significantly improving the luminescent efficiency of PeLEDs. Moreover, we demonstrate neuromorphic display systems that integrate organic synaptic transistors with PeLEDs for sensory signal visualization. Mimicking biological neural pathways, the system translates bio-inspired spike inputs into modulated optical outputs.
In addition to self-emissive PeLEDs, significant progress has been made in color-conversion type displays. PNCs with multi-layer shell structures demonstrate enhanced stability under 60°C and 90% relative humidity, and under high light flux. These ultra-stable PNCs have led to the development of high-efficiency and stable perovskite down-converting LEDs, achieving over 95% of the Rec. 2020 color space, demonstrating the commercial potential of PeNCs.
Beyond display applications, the potential of perovskites in quantum technologies is explored, including their use as single-photon emitters and in laser systems. The ability of perovskites to emit highly coherent single photons at room temperature makes them suitable for integration into quantum communication networks and quantum computing systems. Perovskite-based lasers, with low thresholds and high gain, are also being investigated for other photonic applications. This exploration emphasizes the versatility and potential of MHPs as key materials for future technological advancements.
Tae-Woo Lee is a professor in the Department of Materials Science and Engineering at Seoul National University, Korea. He received his Ph.D. in Chemical Engineering from Korea Advanced Institute of Science and Technology (KAIST), Korea, in 2002. He joined Bell Laboratories, Lucent Technologies, USA, as a postdoctoral researcher in 2002 and then worked at Samsung Advanced Institute of Technology as a member of the research staff (2003–2008). He was an assistant and associate professor in the Department of Materials Science and Engineering at Pohang University of Science and Technology (POSTECH), Korea, until August 2016. He received numerous prestigious awards, including the Merck Award (2006), Korea Young Scientist Award from Korea President (2008), the Scientist of the Month Award from the ministry of science, ICT and future planning in Korea (2013), Research Innovation Award from Ministry of Science and ICT of Korea (2018), Korean Engineering Award (Presidential Award) (2021), Commendation from the Ministry of Trade, Industry and Energy of Korea (Minister’s Award) (2021), and Kyung-Ahm Prize (2023). He was appointed as a Fellow of Korea Academy of Science and Technology in 2021. He was honored as 2020 MRS Fellow and 2024 SPIE Fellow. He has published 311 papers in high-impact journals including Science, Nature, Nature Photonics, Nature Nanotechnology, Nature Biomedical Engineering, Science Advances, Nature Communications, Joule, PNAS, Energy and Environmental Science, and Advanced Materials. He is also the inventor or co-inventor of 445 patented technologies. He currently serves as an editorial board member on the Journals such as Advanced Materials, FlatChem, EcoMat, Chem & Bio Engineering, Materials Today Electronics, Nano Convergence, and Semiconductor Science and Technology, and as an associate editor in Organic Electronics. His research focuses on organic, metal halide perovskite, and carbon materials, and their applications to flexible electronics, printed electronics, displays, solid-state lightings, solar energy conversion devices, and bioinspired neuromorphic devices.