This document discusses electroluminescence and electroluminescent displays. It begins by defining electroluminescence as the emission of light from a material in response to electricity. There are two mechanisms for electroluminescence - intrinsic and charge injection. It then covers electroluminescent materials and devices, describing common inorganic and organic materials used, as well as the basic structure and functioning of electroluminescent displays and their advantages over other display technologies. It concludes by discussing the history and applications of electroluminescent displays.
Basic operating principle and instrumentation of photo-luminescence technique. Brief description about interpretation of a photo-luminescence spectrum. Applications, advantages and disadvantages of photo-luminescence.
Basic operating principle and instrumentation of photo-luminescence technique. Brief description about interpretation of a photo-luminescence spectrum. Applications, advantages and disadvantages of photo-luminescence.
Lithography is the process of transferring patterns of geometric shapes in a mask to a radiation sensitive material called resist,which cover the surface of semiconductor wafer.
A brief overview of the processes involved in nanolithography & nanopatterning. It mainly discusses the steps, mechanism & instrumentation of the electron beam lithography in detail. It also gives a small view on other technologies as well.
The presentation is made as part of introducing some novel technologies in Chemical Engineering. It aims at conveying an overall idea about the Sol-Gel Technology, its underlying processes, applications as well as its future possibilities.
Photoluminescence Spectroscopy for studying Electron-Hole pair recombination ...RunjhunDutta
Description of Photoluminescence Spectroscopy: Principle, Instrumentation & Application.
Three research papers have been summarized which lay stress on Photoluminescence Study for Electron-Hole Pair Recombination for characterizing the properties of semiconductors used in Photoelectrochemical Splitting of Water.
Electroluminescence - The Past, Present And FutureELLUMIGLOW.COM
This slideshow is the history of Electroluminescent Lighting and the various applications, which include EL Wire, EL Tape, EL Paint, Elastolite, and Electroluminescent Panels. The presentation was given to an audience at the Ellumiglow.com workshop in August, 2014. More information can be found by going to http://www.ellumiglow.com.
Lithography is the process of transferring patterns of geometric shapes in a mask to a radiation sensitive material called resist,which cover the surface of semiconductor wafer.
A brief overview of the processes involved in nanolithography & nanopatterning. It mainly discusses the steps, mechanism & instrumentation of the electron beam lithography in detail. It also gives a small view on other technologies as well.
The presentation is made as part of introducing some novel technologies in Chemical Engineering. It aims at conveying an overall idea about the Sol-Gel Technology, its underlying processes, applications as well as its future possibilities.
Photoluminescence Spectroscopy for studying Electron-Hole pair recombination ...RunjhunDutta
Description of Photoluminescence Spectroscopy: Principle, Instrumentation & Application.
Three research papers have been summarized which lay stress on Photoluminescence Study for Electron-Hole Pair Recombination for characterizing the properties of semiconductors used in Photoelectrochemical Splitting of Water.
Electroluminescence - The Past, Present And FutureELLUMIGLOW.COM
This slideshow is the history of Electroluminescent Lighting and the various applications, which include EL Wire, EL Tape, EL Paint, Elastolite, and Electroluminescent Panels. The presentation was given to an audience at the Ellumiglow.com workshop in August, 2014. More information can be found by going to http://www.ellumiglow.com.
The phenomenon of electroluminescence (EL) is the non-thermal conversion of electrical energy into luminous energy
nexus tube_It’s a gaseous glow tube having set of electrodes each shaped in the form of digit
• Mechanical Engineering professional with extensive knowledge in the practical application of science and technology. Specialized in handling Marine Equipment such as Diesel Engines, Air Compressors, Hydraulics, HVAC and Boilers onboard oceangoing Merchant vessels
• 10+ years of proven track record of implementing strategies that enhance productivity and bring efficiency improvement in various machines
• Highly capable of handling health and safety regulations related to transportation of dangerous and hazardous goods such as crude oil, Chemicals, Gasoline at sea
• Possess exemplary communication and analytical skills in troubleshooting Mechanical, controls, Automation, and Electrical faults
• Expertise in providing documentation, detailed instructions, drawings, or specifications to advice Engineers onboard about how devices, parts, equipment, structures are to be fabricated, assembled, modified, maintained and used as per Makers Requirements for Efficient operation
• Ability to inspect Diesel Engine equipment, structures, or materials to identify the cause of errors or other faults
• Competent engineering skills in technical , operational and Maintenance of machines such as Diesel engines, Alternators, Turbochargers, Boilers, Air compressors, Air conditioning and Refrigeration, Hydraulic Machinery, Pumps, Control systems, Electrical equipments such as Motors and Automations of equipments
• Excellent communication and presentation skills in respect to Fuel efficiency, Machinery performance, Budget controls , Inventory of spares, Meeting Energy regulation requirements, implementation of ISO and ISM standards for safe and efficient performance of a vessel
• Core Competencies:
Good knowledge of Arc Welding and fitting job
Proficient in MS Office Applications, Internet, Research, E-mail,
Familiar with AutoCAD 2010 and advanced 3D modeling IDEAS
Proficient with Industrial Risk/Hazards assessment and certified in First Aid/CPR
Good communication skills in English both written and oral with fluency in Hindi, Punjabi.
Certified to work on High Voltage( >1000v) installations as a competent Engineer
Familiar with Canadian Health and Safety Regulations and WHIMS
Proficient in survival craft and Rescue Boat for Emergency Operations
Data transmission through visible light communication (li fi)Omkar Omkar
To transfer data from one device to another using the visual medium as the route of transmission. Our project involves transferring data through Visible light communication (VLC). We designed and implemented VLC transceiver circuit and verified the transmission
of data using DSO in Prototype I. We implemented the Audio transmission of data through VLC in Prototype II. We studied the characteristics of LED, its limitations and studied the different modulation techniques, discussed the issues and challenges faced in implementing the hardware design. We have defined the problem of nonlinearity of LED’s and have studied to mitigate this problem. Based on the change in the signal characteristics due to several phenomena from LED to photo receiver, introduced the channel modeling techniques.
http://www.lighttape.co.uk Light Tape is a flat, thin, flexible, environmentally friendly alternative to traditional display lighting like neon and cold cathode, using no glass, no gas and no mercury.
Li-fi is transmission of data through illumination by taking the fiber out of fiber optics by sending data through a LED light bulb that varies in intensity faster than the human eye can follow. Li-Fi is a wireless optical networking technology that uses light-emitting diodes (LEDs) for data transmission.
Li-Fi is designed to use LED light bulbs similar to those currently in use in many energy-conscious homes and offices. However, LiFi bulbs are outfitted with a chip that modulates the light imperceptibly for optical data transmission. LiFi data is transmitted by the LED bulbs and received by photoreceptors.
Organic Light Emitting Diode works on the same principle as that of a Light emitting Diode which is Electroluminescence.
Which is a result of radiative recombination of Electrons and holes in any Semiconductor Material. These organic LEDs can be classified on several basis such as on the basis of matrix control, on the basis of type of materials used, on the basis of direction in which light exits the surface of OLED,And there several other type of OLEDs such as foldable OLED, Transparent OLED etc.
There are also many methods of manufacturing OLEDs most used of which are inkjet printing and vapor phase deposition etc.
Then finally comes the applications and advantages of this technique. As like LEDs, OLEDs also have a wide area of applications such as in VDUs, PDAs, handheld devices (Like mobile Phones, handheld Gaming consoles), and its future uses include wearable electronics. But as the coin have 2 faces so this technique also have some drawbacks like it is not waterproof and few more which include life time of the device and others.
ITO (indium tin Oxide) & FTO (fluorine doped tin oxide )Preeti Choudhary
Optical and electronic properties of ITO AND FTO:Physical properties, why use as TCOs, optical properties,electronic properties, work function and kelvin probe method and deposition technique.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
1. PONDICHERRY UNIVERSITY
“Center for Nanoscienceand Technology”
NAST-621: Elements of Materials Science and Physical Properties of NanostructuredMaterials
By:
SudamaChaurasiya
M. Tech IIndSem. (NAST)
Submitted to:
Dr. A. Subramania
ELECTROLUMINESCENCE
3. MECHANISM INVOLVE IN ELECTROLUMINESCENCE
There are two distinct mechanisms that can produce electroluminescence in crystals:
1.Pure or intrinsic
2.Charge injection
1.PURE OR INTRINSIC :
InthePureorintrinsic,nonetcurrentpassesthroughthephosphor(electroluminescentmaterial).Theelectricfieldliberateatomicelectrons(fromdonorlevels)intotheconductionband.
Lightisemittedinthenormalwayassoonasanelectronrecombineswithanionizedatomofthecentre.
2. CHARGE INJECTION
Whenanelectrodecontactsacrystaltoprovideaflowofelectronsorholes(electronextraction)oravoltageisappliedtoap–njunctioncausingacurrenttoflow; i.e.,electronsflowfromthen-typematerialintothep-typematerial
In both cases, the electrons lose energy when recombining with centers or
positive holes accompanied by the emission of light.
4. MECHANISM INVOLVE IN ELECTROLUMINESCENCE
Electroluminescenceistheresultofradiativerecombinationofelectronsandholesinamaterial,usuallyasemiconductor.
Theexcitedelectronsreleasetheirenergyasphotons(light).
Priortorecombination,electronsandholesmaybeseparatedeitherbydopingthematerialtoformap-njunction(insemiconductorelectroluminescentdevicessuchaslight-emittingdiodes)orthroughexcitationbyimpactofhigh-energyelectronsacceleratedbyastrongelectricfield(aswiththephosphorsinelectroluminescentdisplays).
5. Spectrum of a blue/green electroluminescent light source for a clock radio Peak wavelength is at 492nm and the FWHM spectral bandwidth is quite wide at about 85nm.
6. ELECTROLUMINESCENT MATERIALS
•There may be either organic or inorganic electroluminescent materials. The active materials are generally semiconductors of wide enough bandwidth to allow exit of the light.
•The most typical inorganic thin-film EL (TFEL) is ZnS:Mnwith yellow- orange emission. Examples of the range of EL material include:
Powdered zinc sulfide doped with copper (producing greenish light) or silver (producing bright blue light)
Thin-film zinc sulfide doped with manganese (producing orange-red color)
Naturally blue diamond, which includes a trace of boron that acts as a dopant.
Semiconductors containing Group III and Group V elements, such as indium phosphide(InP), gallium arsenide (GaAs), and gallium nitride (GaN).
Certain organic semiconductors, such as [Ru(bpy)3]2+(PF6-)2, where bpyis 2,2'-bipyridine.
7. SCIENTIFIC ORIGIN
Electroluminescence was first observed in silicon carbide (SiC) by Captain Henry Joseph Round in 1907.
The second reported observation of electroluminescence occur in 1923, when O.V. Lossevreported electroluminescence again in silicon carbide crystals.
The first thin-film EL structures were fabricated in the late 1950s by Vlasenkoand Popkov.
Soxmanand Ketchpelconducted research between1964 and 1970 that demonstrated the possibility of matrix addressing a TFEL display with high luminance.
In 1968, AronVechtfirst demonstrated a direct current (DC) powered EL panel using powdered phosphors.
8. PRACTICAL IMPLEMENTATION
The most common electroluminescent (EL) devices are composed of either,
•Powder (primarily used in lighting applications)
•Thin films (for information displays.)
POWDER PHOSPHOR-BASED ELECTROLUMINESCENT PANELS
•Frequently used as backlights to liquid crystal displays.
•Consuming relatively little electric power.
•Convenient for battery-operated devices such as pagers, wristwatches.
•Gentle green-cyan glow is a common sight in the technological world.
•They do, however, require relatively high voltage (between 60 and 600 volts). this voltage must be generated by a converter circuit within the device
THIN FILM PHOSPHOR ELECTROLUMINESCENT DEVICE
•Manufactured for medical and vehicle applications.
•TFEL allows for a very rugged and high-resolution display fabricated even on silicon substrates.
9. ELECTROLUMINESCENT DISPLAY (ELDs)
An electroluminescent (EL) device is similar to a laser in that photons are produced by the return of an excited substance to its ground state.
But unlike lasers EL devices require much less energy to operate and do not produce coherent light
There are four steps necessary to produce electroluminescence in ELDs:
1.Electrons tunnel from electronic states at the insulator/phosphor interface.
2.Electrons are accelerated to ballistic energies by high fields in the phosphor.
3.The energetic electrons impact-ionize the luminescent center or create electron-hole pairs that lead to the activation of the luminescent center, and
4.The luminescent center relaxes toward the ground state and emits a photon.
The EL material must be enclosed between two electrodes and at least one electrode must be transparent to allow the escape of the produced light.
10. All ELDs have the same basic structure:
•There are at least six layers to the device.
•The first layer is a baseplate(usually a rigid insulator like glass),
•The second is a conductor,
•The third is an insulator,
•The fourth is a layer of phosphors
•The fifth is an insulator, and
•The sixth is another conductor
STRUCTURE OF AN ELECTROLUMINESCENT DISPLAY
11. •Can be produced to any size or shape.
•Paper Thin -Typically between 0.25mm -0.5mm.
•Lightweight.
•Flexibility -Can be applied to a flat or curved surface.
•Strength -Almost unbreakable.
•Low power consumption -Consumes between 75-90% less electricity than any other light source.
•Efficiency -80% of energy is converted to light.
•Brightness -Brightness can be varied to suit customer requirements.
•Visibility -Can be seen from far distances in darkness, smoke and fog.
•Low operating temperature -EL is a cold lighting source
•Does not generate heat due to its electronic luminous emission.
•No Glare -EL produces a soft even light over the entire surface.
•Waterproof.
•Landfill friendly -EL does not use any hazardous materials.
•Long Life-Over 30,000 hours depending upon brightness.
CHARACTERISTICS OF THE ELECTROLUMINESCENT PANELS
12. ADVANTAGES:
-Low wattage
-Long life
-No external circuitry required (no ballast needed to limit current, it can be plugged directly into AC power and will self-regulate power through it's own resistivity)
-Can be manufactured into flat flexible panels, narrow strings, and other small shapes
-Can be made into waterproof computer monitors which are more durable and light weight than LCDs or Plasma screens.
-Not directional like LCDs when used as a computer monitor, looks good at all angles
-EL displays can handle an impressive -60 C to 95 C temperature range, which LCD monitors cannot do
DISADVANTAGES:
-Not practical for general lighting of large areas due to low lumen output of phosphors (so far)
-Poor lumens per watt rating, however typically the lamp is not used for high lumen output anyway
-Reduced lumen output over time, although newer technologies are better than older phosphors on this point
-Flexible flat EL sheets wear out as they get flexed, durability is being worked on
-The lamps can use significant amount of electricity: 60-600 volts
-Typical EL Needs a converter when used with DC sources such as on watches (to create higher frequency AC power, this is audible)
13. CONCLUSION
Electroluminescent displays (ELDs) have a venerable history starting with the experiments of Captain Henry J. Round in 1907, O.V. Lossevin the Soviet Union, and Georges Destriauin France.
Electroluminescence was mostly a scientific curiosity until the invention of thin film deposition techniques and the discovery that a sandwich of conductors, insulators and phosphors could result in a very efficient and long-lasting form of emissive display.
Electroluminescent display technology is unique and relevant for today’s embedded display solutions. The performance and visual characteristics of high-performance electroluminscentdisplays make it an ideal solution for the most challenging and demanding applications.
14. REFERENCES
1.Alt, Paul M., "Thin Film Electroluminescent Devices: Device Characteristics and Performance," Proceedings of the Society for Information Display, (1984)
2.“A History of Electroluminescent Displays” By Jeffrey A. Hart, Ann Lenwayand Thomas Murtha.
3.Electronic Industries Association of Japan (EIAJ), Research Report on the Visions of the Electronic Display Industry in the Year 2000, transl. By InterLingua(Tokyo: EIAJ, 1993)
4.http://en.wikipedia.org/wiki/electroluminescence
5.http://www.indiana.edu/hightech/fpd/papers/ELDs.html