scholarly journals Efficient and large-area all vacuum-deposited perovskite light-emitting diodes via spatial confinement

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Peipei Du ◽  
Jinghui Li ◽  
Liang Wang ◽  
Liang Sun ◽  
Xi Wang ◽  
...  
Keyword(s):  
High Resolution ◽  
Large Scale ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Scale Production ◽  
Nonradiative Recombination ◽  
Large Area ◽  
Spatial Confinement ◽  
Light Emitting ◽  
Large Scale Production

AbstractWith rapid advances of perovskite light-emitting diodes (PeLEDs), the large-scale fabrication of patterned PeLEDs towards display panels is of increasing importance. However, most state-of-the-art PeLEDs are fabricated by solution-processed techniques, which are difficult to simultaneously achieve high-resolution pixels and large-scale production. To this end, we construct efficient CsPbBr3 PeLEDs employing a vacuum deposition technique, which has been demonstrated as the most successful route for commercial organic LED displays. By carefully controlling the strength of the spatial confinement in CsPbBr3 film, its radiative recombination is greatly enhanced while the nonradiative recombination is suppressed. As a result, the external quantum efficiency (EQE) of thermally evaporated PeLED reaches 8.0%, a record for vacuum processed PeLEDs. Benefitting from the excellent uniformity and scalability of the thermal evaporation, we demonstrate PeLED with a functional area up to 40.2 cm2 and a peak EQE of 7.1%, representing one of the most efficient large-area PeLEDs. We further achieve high-resolution patterned perovskite film with 100 μm pixels using fine metal masks, laying the foundation for potential display applications. We believe the strategy of confinement strength regulation in thermally evaporated perovskites provides an effective way to process high-efficiency and large-area PeLEDs towards commercial display panels.

A system for large scale production of chrysanthemum using microponics with the supplement of silver nanoparticles under light-emitting diodes

2018 ◽  
Vol 232 ◽  
pp. 153-161 ◽  
Author(s):  
Hoang Thanh Tung ◽  
Nguyen Ba Nam ◽  
Nguyen Phuc Huy ◽  
Vu Quoc Luan ◽  
Vu Thi Hien ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Large Scale ◽  
Light Emitting Diodes ◽  
Scale Production ◽  
Light Emitting ◽  
Large Scale Production

scholarly journals Functionalization of Molybdenum Disulfide via Plasma Treatment and 3-Mercaptopropionic Acid for Gas Sensors

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1860
Author(s):  
Won Seok Seo ◽  
Dae Ki Kim ◽  
Ji-Hoon Han ◽  
Kang-Bak Park ◽  
Su Chak Ryu ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Plasma Treatment ◽  
Molybdenum Disulfide ◽  
Functional Groups ◽  
Large Scale ◽  
Scale Production ◽  
Large Area ◽  
Mercaptopropionic Acid ◽  
Large Scale Production ◽  
Mechanical Factors

Monolayer and multilayer molybdenum disulfide (MoS2) materials are semiconductors with direct/indirect bandgaps of 1.2–1.8 eV and are attractive due to their changes in response to electrical, physicochemical, biological, and mechanical factors. Since the desired electrical properties of MoS2 are known, research on its electrical properties has increased, with focus on the deposition and growth of large-area MoS2 and its functionalization. While research on the large-scale production of MoS2 is actively underway, there is a lack of studies on functionalization approaches, which are essential since functional groups can help to dissolve particles or provide adequate reactivity. Strategies for producing films of functionalized MoS2 are rare, and what methods do exist are either complex or inefficient. This work introduces an efficient way to functionalize MoS2. Functional groups are formed on the surface by exposing MoS2 with surface sulfur vacancies generated by plasma treatment to 3-mercaptopropionic acid. This technique can create 1.8 times as many carboxyl groups on the MoS2 surface compared with previously reported strategies. The MoS2-based gas sensor fabricated using the proposed method shows a 2.6 times higher sensitivity and much lower detection limit than the untreated device.

The Synthesis of Novel Organic Light-Emitting Material 2,7-Dibromo-2′,3′,6′,7′-Tetra(2-Methylbutyloxy)spirobifluorene

2011 ◽  
Vol 287-290 ◽  
pp. 270-275 ◽  
Author(s):  
Xiao Xia Sun ◽  
Ying Chun Li ◽  
Xi Mei Liu ◽  
Xiao Xiao Zhuang ◽  
Ya Zhou Lou
Keyword(s):  
Large Scale ◽  
Coating Process ◽  
Scale Production ◽  
Light Emitting ◽  
Good Solubility ◽  
Full Color ◽  
Organic Light ◽  
Large Scale Production ◽  
Synthetic Procedure ◽  
Process Ability

A mide, simple and efficient synthetic procedure for the preparation of 2,7-dibromo-2′,3′,6′,7′-tetra(2-methylbutyloxy)spirobifluorene and key intermediates, tetra(2-methlbutyloxy)biphenyl ，2-bromo-4,5,3′,4′-tetra(2-methylbutyloxy)biphenyl, 2,7-Dibromo-2′,6,3′,7′--tetra(2-methylbutyloxy)biphenyl-9-Fluorenol, has been developed. The procedure described herein offers several advantages, including high product yields, easy purification, and large scale production. Ether protected 2,7-dibromo-9,9′-spirobifluorene has good solubility in organic aolvents to permit an appropriate coating process, ability to achieve various colors so as to make full color display elements possible.

Growth and characterization of high-efficiency InGaN MQW blue and green LEDs from large-scale-production MOCVD reactors

1999 ◽  
Author(s):  
Chuong A. Tran ◽  
Robert F. Karlicek, Jr. ◽  
Michael G. Brown ◽  
Ivan Eliashevich ◽  
Alexander Gurary ◽  
...  
Keyword(s):  
Large Scale ◽  
High Efficiency ◽  
Scale Production ◽  
Large Scale Production ◽  
Green Leds

Printing polyaniline for sensor applications

2013 ◽  
Vol 67 (8) ◽  
Author(s):  
Karl Crowley ◽  
Malcolm Smyth ◽  
Anthony Killard ◽  
Aoife Morrin
Keyword(s):  
Conducting Polymer ◽  
Inkjet Printing ◽  
Large Scale ◽  
Low Cost ◽  
Clinical Diagnostics ◽  
Scale Production ◽  
Light Emitting ◽  
Sensor Applications ◽  
Sensing Applications ◽  
Large Scale Production

AbstractIn recent years, much research has focused on the development of low-cost, printed electrochemical sensor platforms for environmental monitoring and clinical diagnostics. Much effort in this area has been based on utilising the redox properties of conducting polymers, particularly polyaniline (PANI). In tackling the inherent lack of processability exhibited by these materials, several groups have examined various mass-amenable fabrication approaches to obtain suitable thin films of PANI for sensing applications. Specifically, the approaches investigated over the years include the in situ chemical synthesis of PANI, the use of sulphonated derivatives of PANI and the synthesis of aqueousbased nano-dispersions of PANI. Nano-dispersions have shown a great deal of promise for sensing applications, given that they are inkjet-printable, facilitating the patterning of conducting polymer directly to the substrate. We have shown that inkjet-printed films of PANI can be finely controlled in terms of their two-dimensional pattern, thickness, and conductivity, highlighting the level of precision achievable by inkjet printing. Utilising these nanomaterials as inkjet-printable inks opens novel, facile, and economical possibilities for conducting polymer-printed electronic applications in areas of sensing, but also many other application areas such as energy storage, displays, organic light-emitting diodes. Given that inkjet-printing is a scalable manufacturing technique, it renders possible the large-scale production of devices such as sensors for a range of applications. Several successes have emerged from our work and from the work of others in the area of applying PANI in low-cost sensor applications, which is the focus of this review.

scholarly journals Optimization of Quantum Dot Thin Films using Electrohydrodynamic Jet Spraying for Solution-Processed Quantum Dot Light-Emitting Diodes

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Tuan Canh Nguyen ◽  
Thi Thu Thuy Can ◽  
Woon-Seop Choi
Keyword(s):  
Quantum Dot ◽  
High Performance ◽  
Large Scale ◽  
Light Emitting Diodes ◽  
Good Method ◽  
Large Area ◽  
Solution Processed ◽  
Light Emitting ◽  
Line Method ◽  
Straight Line

Abstract The electrohydrodynamic (EHD) jet spraying process is a good method for making quantum dot (QD) layers in light-emitting diodes (LEDs). However, controlling the morphology and large-scale fabrication of the QD layers are critical for realizing all-solution-processed QD-LEDs with high performance. Three spraying techniques were used with the EHD jet spraying technique: a big circular film method, a spiral-line method, and a straight-line method. These techniques were used to obtain QD films with good uniformity. The straight-line spray showed the most promise to obtain a uniform QD layer with large area, and QD-LEDs made with this method showed better performance with a low turn-on voltage of 3.0 V, a luminance of 7801 cd/m2, and a maximum current efficiency of 2.93 cd/A.

scholarly journals Surface Chemistry Provoked Strategy to Develop Sustainable Latent Fingerprints Visualization and Multiple Anti-Counterfeiting Trajectory: Aggregation-Induced Emission Mechanism Based Active Conjugated Imidazole Luminogens

2021 ◽  
Author(s):  
M. K. Ravindra ◽  
Giriyapura Prabhukumara Darshan ◽  
D. R. Lavanya ◽  
K. M. Mahadevan ◽  
H. B. Premkumar ◽  
...  
Keyword(s):  
Large Scale ◽  
Poly Vinyl Alcohol ◽  
Scale Production ◽  
Latent Fingerprints ◽  
One Pot ◽  
Aggregation State ◽  
Dual Nature ◽  
Light Emitting ◽  
Aggregation Induced Emission ◽  
Large Scale Production

Abstract Aggregation-induced emission based organic heterocyclic luminogens bearing conjugated electronic structure have paid much attention due to its excellent fluorescence in aggregation state. In this communication, novel conjugated blue light emitting imidazole molecule is synthesized by one pot multicomponent reaction route is reported for the first time. The prepared molecule exhibits a strong fluorescence in aggregation state have gain much attention owing to their unique properties, namely simple synthesis, high purity, inexpensive, eco-friendly, large scale production, high photostability, etc. By considering these advantages of the prepared luminogen, a new fluorescence based platform has been setup for in-situ visualization of latent fingerprints and its preservation by spray method followed by Poly(vinyl alcohol) masking. A clear and well defined fluorescence fingerprint images on variety of surfaces by revealing level 1–3 ridge characteristics upon ultraviolet 365 nm light are noticed. The dual nature of binding specificity as well as excellent fluorescence properties permits the visualization of latent fingerprints for longer durations (up to 365 days) with superior contrast, sensitivity, efficiency, selectivity and negligible background hindrance. We further fabricated unclonable invisible security ink and make it highly suitable for various printing modes on valuable goods for protection against forging. The developed labels are displaying uniform distribution of ink and exceptional stability under various atmospheric environments. The development of long preservative forensic information as well as invisible ink opens new avenue in advanced forensic and data security applications.

Sign in / Sign up

Export Citation Format

Share Document