Moonsub Shim

Transient Electroluminescence Delay and Capacitive Charging of the Hole Transport Layer in Quantum Dot Light-Emitting Diodes

Conan Huang, Nuri Oh, Moonsub Shim

Abstract The first critical steps of electroluminescence in quantum dot light-emitting diodes are the charge accumulation and transport processes upon the application of a driving voltage. Transient electroluminescence measurements with systematically varying offset voltages are carried out to separate out the capacitive …

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Correction to “Kinetics of Concurrent Seed Growth and Cation Exchange in Transforming Cu 2-x S Nanocrystals to CuGaS 2 Nanorods”

Yunpei Duan, Moonsub Shim

Mg-Doped NiO Hole Transport Layers with Ultrathin ALD-MgO Diffusion Barriers for All-Inorganic Quantum Dot Light-Emitting Diodes

Min Seok Kim, Rakesh Kumar Jha, Yongju Kim, Jeong Woo Park et autres

Although hybrid quantum dot (QD) light-emitting diodes (QLEDs) commonly rely on organic hole transport layers, their vulnerability to oxygen and moisture severely limits their long-term stability. Replacing these organics with p-type transparent oxide semiconductors such as NiO offers a chemically and electronically …

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(Keynote) Colloidal Quantum Dot and Nanorod Heterostructures

Moonsub Shim

Engineering band structure and heterointerfaces has been and continues to be critical for advances in electronics, optoelectronics, photovoltaics, and displays among many high-tech applications. Achieving atomic precision through widely-accessible and cost-effective means would allow rapid advances in these critical areas. The evolution …

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Integration of Quantum Dot Light-Emitting Diodes and Charge Trap Thin-Film Transistor Arrays for Memory-In-Pixel Applications

Seoungmin Park, Eun A Kim, Gijun Ju, H S Jeong et autres

The advancement of ultrahigh-resolution displays and extended reality applications has driven increasing demand for compact and low-power device architectures capable of simultaneously performing memory and light-emission functions at the pixel level. To address this need, charge-trap thin-film transistors (CTTFTs) based on oxide …

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General approach for automated purification of quantum dots using size-exclusion chromatography

Jeff Xu, Conan Huang, Logan P. Keating, Yunpei Duan et autres

Size-exclusion chromatography demonstrates efficient, one-step purification of crude quantum dot (QD) mixtures to generate high-purity QD fractions.

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Nanofabrication for Nanophotonics

Younghwan Yang, Youngsun Jeon, Zhaogang Dong, Joel K. W. Yang et autres

Nanofabrication, a pivotal technology at the intersection of nanoscale engineering and high-resolution patterning, has substantially advanced over recent decades. This technology enables the creation of nanopatterns on substrates crucial for developing nanophotonic devices and other applications in diverse fields including electronics and …

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Tunable Near-Infrared Emission from CdSe/CdTe/CdSe Core/Shell/Shell Quantum Dots

Conan Huang, Yunpei Duan, Nikolay S. Makarov, Hunter McDaniel et autres

Core/shell nanostructures of type I and type II band-offset materials have been pivotal in improving photoluminescence and imparting charge separation in well-established colloidal quantum dots. In addition to these features, the multishell motif provides a simple means to expand the emission spectral …

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Kinetics of Concurrent Seed Growth and Cation Exchange in Transforming Cu 2-x S Nanocrystals to CuGaS 2 Nanorods

Yunpei Duan, Moonsub Shim

Cation exchange can convert nanocrystals that have already been achieved with a well-controlled size, size distribution, and shape to a broad range of compositions. However, cation exchange can often be accompanied by changes in the nanocrystal morphology/shape as exemplified by the synthesis …

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Mg-doped NiO hole transport layers with ultrathin ALD-MgO diffusion barriers for all-inorganic quantum dot light-emitting diodes

Min Seok Kim, Rakesh Kumar Jha, Jeong Woo Park, Hyeonseung Ban et autres

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Coffee‐Ring Mediated Thinning and Thickness‐Dependent Dewetting Modes in Printed Polymer Droplets Coupled with Assembly of Quantum Dots for Anti‐Counterfeiting

Ilker Torun, Conan Huang, N. Burak Kiremitler, Mustafa Kalay et autres

Molecular transport processes in printed polymer droplets hold enormous importance for understanding wetting phenomena and designing systems in applications such as encoding, electronics, photonics, and sensing. This paper studies thickness-dependent dewetting modes that are activated by thermal annealing and driven by interfacial …

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A high temperature in situ optical probe for colloidal nanocrystal synthesis

Logan P. Keating, Conan Huang, Moonsub Shim

We report on the fabrication and utilization of a robust high-temperature (>300 °C), adjustable-path-length, vacuum-tolerant, configurable, in situ optical probe, which interfaces with widely used chemical glassware via a 14/20 ground glass joint. This probe allows for high-speed reaction monitoring of colloidal …

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