Understanding Illumination Effect on Saturation Behavior of Thin Film Transistor

Article Chemistry, Multidisciplinary

Electron Trap Dynamics in Polymer Light-Emitting Diodes

Matthias Diethelm et al.

Summary: This study provides useful insights into the chemical nature of universal electron traps in semiconducting polymers. The researchers discovered that the filling of electron traps is much slower than commonly believed.

ADVANCED FUNCTIONAL MATERIALS (2022)

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Article Engineering, Electrical & Electronic

Evaluation of Positive-Bias-Stress-Induced Degradation in InSnZnO Thin-Film Transistors by Low Frequency Noise Measurement

Zhendong Jiang et al.

Summary: This study evaluates the degradation of InSnZnO thin-film transistors (TFTs) under positive bias stress (PBS) for the first time using low frequency noise (LFN) measurement. The results show that with increasing PBS time, the LFN level and trap state density initially decrease and then increase, while the dominant fluctuation model shifts from carrier number fluctuation to bulk carrier mobility fluctuation. A degradation model based on the interaction of oxygen vacancies, hydrogens, and electrons is tentatively proposed and discussed.

IEEE ELECTRON DEVICE LETTERS (2022)

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Article Multidisciplinary Sciences

High-brightness all-polymer stretchable LED with charge-trapping dilution

Zhitao Zhang et al.

Summary: Researchers have developed stretchable all-polymer-based light-emitting diodes with high brightness, current efficiency, and stretchability. The stretchable LEDs can be colored red, green, and blue, and are capable of on-skin wireless powering and real-time displaying of pulse signals. This advancement is significant for the development of high-performance stretchable displays.

NATURE (2022)

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Article Nanoscience & Nanotechnology

Wafer-scale monolithic integration of full-colour micro-LED display using MoS2 transistor

Sumin Hwangbo et al.

Summary: This paper presents a novel fabrication method for the integration of transition metal dichalcogenides with compound semiconductors, which is compatible with a batch microfabrication process. The authors demonstrate the synthesis of a thin film of molybdenum disulfide on a gallium-nitride-based epitaxial wafer, which is then used to form a thin film transistor array. This transistor array is subsequently integrated with micro-light-emitting-diode devices to create an active matrix micro-LED display. The authors also show a simple approach for obtaining red and green colors through the printing of quantum dots on a blue micro-LED, enabling the scalable fabrication of full-color micro-LED displays.

NATURE NANOTECHNOLOGY (2022)

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Article Engineering, Electrical & Electronic

Investigation on Stability in Solution-Processed In-Zn-Sn-O TFT Array Under Various Intensity of Illumination

Bin Jing et al.

Summary: This study investigates the effect of light illumination intensity on the stability of solution processed In-Zn-Sn-O (IZTO) thin-film transistor (TFT) arrays. The results show that light illumination suppresses Vth shift under positive bias illumination stress, but leads to two-stage degradation and the occurrence of a hump phenomenon under negative bias illumination stress. The severity of the hump phenomenon is directly related to the light illumination intensity.

IEEE TRANSACTIONS ON ELECTRON DEVICES (2022)

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Article Materials Science, Multidisciplinary

Recent progress of organic light-emitting diode microdisplays for augmented reality/virtual reality applications

Chan-mo Kang et al.

Summary: OLED microdisplays are highly favored for their rich colors, high contrast ratio, fast response time, small form factor, and high resolution, making them ideal for various applications in devices.

JOURNAL OF INFORMATION DISPLAY (2022)

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Review Chemistry, Multidisciplinary

A Brief History of OLEDs-Emitter Development and Industry Milestones

Gloria Hong et al.

Summary: Organic light-emitting diodes (OLEDs) have undergone significant development over the past 30 years, with advancements in emitter materials leading to three generations of OLED devices. Research is now focused on the fourth generation of OLEDs, with academia and industry achieving milestones in the development of green, orange-red, and blue OLED emitters.

ADVANCED MATERIALS (2021)

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Article Engineering, Electrical & Electronic

31-Inch 4K Flexible Display Employing Gate Driver With Metal Oxide Thin-Film Transistors

Yan Xue et al.

Summary: A 31-inch 4K flexible AMOLED display with GOA technology has been developed to reduce leakage current and achieve high pixel density using IJP OLED process. TG IGZO TFTs are utilized to further improve signal transfer speed in the display.

IEEE ELECTRON DEVICE LETTERS (2021)

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Article Multidisciplinary Sciences

Ligand-engineered bandgap stability in mixed-halide perovskite LEDs

Yasser Hassan et al.

Summary: By utilizing multidentate ligands to treat mixed-halide perovskite nanocrystals, efficient and color-stable red electroluminescence with a wavelength centered at 620 nanometers and an external quantum efficiency of 20.3% has been achieved. The key function of the ligand treatment is to 'clean' the nanocrystal surface by removing lead atoms, which suppresses the formation of iodine Frenkel defects and halide segregation. This work demonstrates the sensitivity of metal halide perovskites to surface properties and provides a pathway to control surface defect formation and migration, crucial for achieving bandgap stability for light emission and potentially impacting other optoelectronic applications.

NATURE (2021)

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Article Chemistry, Physical

Efficient and low-voltage vertical organic permeable base light-emitting transistors

Zhongbin Wu et al.

Summary: This study demonstrated organic permeable base light-emitting transistors, which are three-terminal vertical optoelectronic devices operating at driving voltages below 5.0 V, emitting in the red, green, and blue ranges, and achieving peak external quantum efficiencies of 19.6%, 24.6%, and 11.8%, respectively. The key to the good performance obtained is the nano-pore permeable base electrode located at the center of the device, which forms a distinctive optical microcavity and regulates charge carrier injection and transport. This work paves the way towards efficient and low-voltage organic light-emitting transistors, beneficial for power-efficient active matrix displays and solid-state lighting.

NATURE MATERIALS (2021)

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Review Chemistry, Multidisciplinary

Organic Field Effect Transistor-Based Photonic Synapses: Materials, Devices, and Applications

Qing Zhang et al.

Summary: Photonic artificial synapses-based neuromorphic computing systems are promising candidates for replacing von Neumann-based systems. Organic field-effect transistors (OFETs) have significant advantages in synaptic emulation, enabling complex photoelectric modulation and simulation of the visual system.

ADVANCED FUNCTIONAL MATERIALS (2021)

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Article Engineering, Electrical & Electronic

Monolithic Thin Film Red LED Active-Matrix Micro-Display by Flip-Chip Technology

Peian Li et al.

Summary: A monolithic thin film red LED micro-display driven by a CMOS driver has been successfully fabricated, delivering high brightness and image quality. This work also lays the foundation for hybrid integration with blue/green LEDs to achieve full-color LED micro-displays.

IEEE PHOTONICS TECHNOLOGY LETTERS (2021)

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Article Nanoscience & Nanotechnology

Three-dimensional monolithic micro-LED display driven by atomically thin transistor matrix

Wanqing Meng et al.

Summary: Low-temperature ultraclean integration of large-area MoS2 thin-film transistors with nitride micro-LEDs through a back end of line process enables high-resolution displays with excellent performance and uniformity. This integration shows the potential of MoS2 TFTs in driving micro LEDs to high luminance under low voltage, making them suitable for a range of display applications up to the high resolution and brightness limit.

NATURE NANOTECHNOLOGY (2021)

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Article Chemistry, Multidisciplinary