scholarly journals Perovskite nanowire–block copolymer composites with digitally programmable polarization anisotropy

2019 ◽  
Vol 5 (5) ◽  
pp. eaav8141 ◽  
Author(s):  
Nanjia Zhou ◽  
Yehonadav Bekenstein ◽  
Carissa N. Eisler ◽  
Dandan Zhang ◽  
Adam M. Schwartzberg ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Flexible Electronics ◽  
Optoelectronic Device ◽  
One Dimensional ◽  
Full Color ◽  
Color Displays ◽  
Digitally Programmable ◽  
3D Printed ◽  
Storage Encryption ◽  
Lead Halide

One-dimensional (1D) nanomaterials with highly anisotropic optoelectronic properties are key components in energy harvesting, flexible electronics, and biomedical imaging devices. 3D patterning methods that precisely assemble nanowires with locally controlled composition and orientation would enable new optoelectronic device designs. As an exemplar, we have created and 3D-printed nanocomposite inks composed of brightly emitting colloidal cesium lead halide perovskite (CsPbX3, X = Cl, Br, and I) nanowires suspended in a polystyrene-polyisoprene-polystyrene block copolymer matrix. The nanowire alignment is defined by the programmed print path, resulting in optical nanocomposites that exhibit highly polarized absorption and emission properties. Several devices have been produced to highlight the versatility of this method, including optical storage, encryption, sensing, and full-color displays.

scholarly journals Operando direct observation of spin-states and charge-trappings of blue light-emitting-diode materials in thin-film devices

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Fumiya Osawa ◽  
Kazuhiro Marumoto
Keyword(s):  
Blue Light ◽  
High Performance ◽  
Density Functional ◽  
Light Emitting Diode ◽  
Green Light ◽  
Spin States ◽  
Light Emitting ◽  
Full Color ◽  
Color Displays ◽  
Materials Used

Abstract Spin-states and charge-trappings in blue organic light-emitting diodes (OLEDs) are important issues for developing high-device-performance application such as full-color displays and white illumination. However, they have not yet been completely clarified because of the lack of a study from a microscopic viewpoint. Here, we report operando electron spin resonance (ESR) spectroscopy to investigate the spin-states and charge-trappings in organic semiconductor materials used for blue OLEDs such as a blue light-emitting material 1-bis(2-naphthyl)anthracene (ADN) using metal–insulator–semiconductor (MIS) diodes, hole or electron only devices, and blue OLEDs from the microscopic viewpoint. We have clarified spin-states of electrically accumulated holes and electrons and their charge-trappings in the MIS diodes at the molecular level by directly observing their electrically-induced ESR signals; the spin-states are well reproduced by density functional theory. In contrast to a green light-emitting material, the ADN radical anions largely accumulate in the film, which will cause the large degradation of the molecule and devices. The result will give deeper understanding of blue OLEDs and be useful for developing high-performance and durable devices.

scholarly journals Advances in Quantum-Dot-Based Displays

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1327 ◽  
Author(s):  
Yu-Ming Huang ◽  
Konthoujam James Singh ◽  
An-Chen Liu ◽  
Chien-Chung Lin ◽  
Zhong Chen ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Flexible Substrate ◽  
Potential Candidate ◽  
White Leds ◽  
Full Color ◽  
Color Displays ◽  
High Illumination ◽  
Coating Methods ◽  
Good Potential

In terms of their use in displays, quantum dots (QDs) exhibit several advantages, including high illumination efficiency and color rendering, low-cost, and capacity for mass production. Furthermore, they are environmentally friendly. Excellent luminescence and charge transport properties of QDs led to their application in QD-based light-emitting diodes (LEDs), which have attracted considerable attention in display and solid-state lighting applications. In this review, we discuss the applications of QDs which are used on color conversion filter that exhibit high efficiency in white LEDs, full-color micro-LED devices, and liquid-type structure devices, among others. Furthermore, we discuss different QD printing processes and coating methods to achieve the full-color micro-LED. With the rise in popularity of wearable and see-through red, green, and blue (RGB) full-color displays, the flexible substrate is considered as a good potential candidate. The anisotropic conductive film method provides a small controllable linewidth of electrically conductive particles. Finally, we discuss the advanced application for flexible full-color and highly efficient QD micro-LEDs. The general conclusion of this study also involves the demand for a more straightforward QD deposition technique, whose breakthrough is expected.

Conductive nanomaterials for 2D and 3D printed flexible electronics

2019 ◽  
Vol 48 (6) ◽  
pp. 1712-1740 ◽  
Author(s):  
Alexander Kamyshny ◽  
Shlomo Magdassi
Keyword(s):  
Carbon Nanotubes ◽  
Metal Nanoparticles ◽  
Flexible Electronics ◽  
Graphene Sheets ◽  
Recent Developments ◽  
3D Printed ◽  
Conductive Nanomaterials ◽  
2D And 3D

This review describes recent developments in the field of conductive nanomaterials and their application in 2D and 3D printed flexible electronics, with particular emphasis on inks based on metal nanoparticles and nanowires, carbon nanotubes, and graphene sheets.

All-Optical Full-Color Displays Using Polymer Nanofibers

ACS Nano ◽  
2011 ◽  
Vol 5 (3) ◽  
pp. 2020-2025 ◽  
Author(s):  
Huaqing Yu ◽  
Dongwei Liao ◽  
Michael B. Johnston ◽  
Baojun Li
Keyword(s):  
Polymer Nanofibers ◽  
Full Color ◽  
Color Displays ◽  
All Optical
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