Development of a cost effective surface-patterned transparent conductive coating as top-contact of light emitting diodes

2014 ◽  
Vol 115 (19) ◽  
pp. 193108 ◽  
Author(s):  
Arpita Haldar ◽  
Susanta Bera ◽  
Sunirmal Jana ◽  
Kallol Bhattacharya ◽  
Rajib Chakraborty
Keyword(s):  
Light Emitting Diodes ◽  
Cost Effective ◽  
Effective Surface ◽  
Light Emitting ◽  
Conductive Coating ◽  
Top Contact

Cost-Effective Light-Mixing Module for Solar-Lighting System Appended With Auxiliary RGBW Light-Emitting Diodes

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
An Chi Wei ◽  
Shih Chieh Lo ◽  
Ju-Yi Lee ◽  
Hong-Yih Yeh
Keyword(s):  
Light Source ◽  
Light Emitting Diodes ◽  
Cylindrical Tube ◽  
Cost Effective ◽  
Lighting System ◽  
Optical Efficiency ◽  
Light Emitting ◽  
Solar Lighting ◽  
Lighting Systems ◽  
Main Components

A light-mixing module consisting of a compound parabolic concentrator (CPC) and a light-mixing tube is proposed herein to realize a uniform and efficient solar-lighting system. In this lighting system, the sunlight collected into a fiber and then guided to an indoor destination is the principal light source, while an auxiliary light source including multiple red, green, blue, and white (RGBW) light-emitting diodes (LEDs) is controlled by an auto-compensating module. To mix the principal and the auxiliary sources and to realize the uniform illumination, the light-mixing tube was coated with BaSO4 and optimized as a cylindrical tube. The design of the light-mixing tube is described and discussed in this article. According to the simulated results, the uniformity and the optical efficiency of the designed light-mixing tube are 82.9% and 85.7%, respectively, while from the experimental results, the uniformity of 85.9% and the optical efficiency of 83.3% have been obtained. In terms of the common indoor-lighting standards and the specifications of commercial components used in lighting systems, the proposed light-mixing module has demonstrated the high uniformity and acceptable optical efficiency. Additionally, since the main components of the light-mixing module can be designed as plastic optics, a cost-effective light-mixing module and a profitable lighting system can be realized. Thus, the performance and the price of the proposed light-mixing module fit the demands of the illumination market, while the proposed system shows the potential for indoor solar-lighting applications.

scholarly journals Efficient white polymer light-emitting diodes (WPLEDs) based on covalent-grafting of [Zn2(MP)3(OAc)] into PVK

2020 ◽  
Vol 11 (10) ◽  
pp. 2640-2646 ◽  
Author(s):  
Guorui Fu ◽  
Yani He ◽  
Wentao Li ◽  
Tiezheng Miao ◽  
Xingqiang Lü ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Cost Effective ◽  
Large Area ◽  
Light Emitting ◽  
Grafted Polymer ◽  
Covalent Grafting ◽  
Polymer Light Emitting Diodes

Using [Zn2(MP)3(OAc)]-grafted polymer as a single emitting layer, record-high efficiencies and weak (ca. 25%) efficiency roll-off are realized for cost-effective and large-area flexible WPLEDs.

Thermally activated delayed fluorescence of co-deposited copper(i) complexes: cost-effective emitters for highly efficient organic light-emitting diodes

2017 ◽  
Vol 5 (28) ◽  
pp. 6982-6988 ◽  
Author(s):  
Zixing Wang ◽  
Jun Zhu ◽  
Zhiwei Liu ◽  
Peng Wu ◽  
Hedan Wang ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Cost Effective ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Copper Iodide ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Organic Light

TADF copper(i) complexes were made by co-depositing carboline derivatives and copper iodide. δ-Carboline derivative-based OLEDs showed 6 times higher efficiency than α-carboline derivative-based ones.

scholarly journals Terahertz strong-field physics in light-emitting diodes for terahertz detection and imaging

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Chen Ouyang ◽  
Shangqing Li ◽  
Jinglong Ma ◽  
Baolong Zhang ◽  
Xiaojun Wu ◽  
...  
Keyword(s):  
Response Time ◽  
Light Emitting Diodes ◽  
Impact Ionization ◽  
Strong Field ◽  
Schottky Contact ◽  
Cost Effective ◽  
Light Emitting ◽  
Thz Detectors ◽  
Strong Field Physics ◽  
Temperature Operating

AbstractIntense terahertz (THz) electromagnetic fields have been utilized to reveal a variety of extremely nonlinear optical effects in many materials through nonperturbative driving of elementary and collective excitations. However, such nonlinear photoresponses have not yet been obeserved in light-emitting diodes (LEDs), let alone employing them as fast, cost-effective, compact, and room-temperature-operating THz detectors and cameras. Here, we report ubiquitously available LEDs exhibiting photovoltaic signals of ~0.8 V and ~2 ns response time with signal-to-noise ratios of ~1300 when being illuminated by THz field strengths ~240 kV/cm. We also demonstrated THz-LED detectors and camera prototypes. These unorthodox THz detectors exhibited high responsivities (>1 kV/W) with response time four orders of magnitude shorter than those of pyroelectric detectors. The mechanism was attributed to THz-field-induced impact ionization and Schottky contact. These findings not only help deepen our understanding of strong THz field-matter interactions but also contribute to the applications of strong-field THz diagnosis.

scholarly journals Design and Implementation of a Sequential Digital Display for a Nigerian University

2018 ◽  
Vol 3 (2) ◽  
Author(s):  
Adetoye Aribisala ◽  
Oluwaseun Martins ◽  
Adegboyega Otenaike ◽  
John Ajayi
Keyword(s):  
Integrated Circuit ◽  
Light Emitting Diodes ◽  
Cost Effective ◽  
Electronic System ◽  
Digital Display ◽  
Light Emitting ◽  
The Public ◽  
Nigerian University ◽  
Effective Design ◽  
Study Center

A sequential digital display is an electronic system that is used to display information to the public. It is a device that contains light emitting diodes that conveys messages by a programmable controller or mechanical processes, regardless of size. Sequential digital display is fast gaining acceptance and application in different spheres of life. In this work, a sequential digital display system was designed and implemented. The components used include transformer, diodes, voltage regulator, resistors (fixed and variable types), capacitors, NE 555 timer, IC4017, IC7432, light emitting diodes and transistors. The aim of the project was to carry out a cost effective design, therefore, the components of the design were readily available and relatively cheap. The light emitting diodes displayed a message written as: Welcome to NOUN Ado-Ekiti study center. The project was tested and commissioned and found to meet specified design requirements.Keywords—Integrated Circuit, Light Emitting Diodes, Sequential Digital Display, Transistor

scholarly journals Flexible nanophosphor films doped with Mie resonators for enhanced out-coupling of the emission

2019 ◽  
Vol 7 (2) ◽  
pp. 267-274 ◽  
Author(s):  
José M. Miranda-Muñoz ◽  
Dongling Geng ◽  
Mauricio E. Calvo ◽  
Gabriel Lozano ◽  
Hernán Míguez
Keyword(s):  
Light Emitting Diodes ◽  
Cost Effective ◽  
Solution Processing ◽  
Effective Solution ◽  
Processing Methods ◽  
Light Emitting ◽  
General Method

Herein, we present a general method to prepare self-standing flexible photoluminescent coatings of controlled opacity for integration into light-emitting diodes (LEDs) employing cost-effective solution-processing methods.

The Standardization of Printable Materials and Direct Writing Systems

2013 ◽  
Vol 135 (1) ◽  
Author(s):  
Jessica Hoffman ◽  
Seyeon Hwang ◽  
Ada Ortega ◽  
Nam-Soo Kim ◽  
Kyoung-sik Moon
Keyword(s):  
Flexible Electronics ◽  
Radio Frequency Identification ◽  
Light Emitting Diodes ◽  
Printed Electronics ◽  
Cost Effective ◽  
Materials Testing ◽  
Direct Writing ◽  
Writing Systems ◽  
Light Emitting ◽  
Identification Tags

Direct-writing systems will be leading the future of additive manufacturing in that they have simple and cost-effective processes. There are various types of direct-writing systems, such as the roll-to-roll (R2R), microdispensing deposition write (MDDW), maskless mesoscale materials deposition (M3D), and ink-jet systems. These technologies are being used for the production of radio frequency identification tags (RFIDs), organic light-emitting diodes (OLEDs), light-emitting diodes (LEDs), flexible electronics, solar cells, antennas, etc. Recently, the standardization of printing materials and equipment has become a key issue in the printed electronics industry. The standardization of printed electronics can be categorized into four parts: equipment, materials, testing methods, and the education of this technology.

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