Light Emitting Diodes

This note covers the following topics: Fundamentals of Semiconductor Diodes, Light Emitting Diode Construction, Development of Multiple LED Colors, White Light LEDs.

This note discuss the physics of a variety of device concepts that are introduced to realize white OLEDs based on both polymer and small molecule organic materials.

This book explains the following topics related to light emitting diodes: Simple Model of an LED, Radiation Sources, Interaction of Electrons With Matter, Effects of Electron Radiation on LEDs, Linear Accelerator, Temperature Considerations, LED Light Output Degradation, LED Wavelength Alteration, LED Current Versus Forward Bias.

A light-emitting diode (LED) is a two-lead semiconductor light source. It is a p�n junction diode, which emits light when activated. Topics covered includes: Discoveries and early devices, Blue LED, White LEDs and the Illumination breakthrough, working principle, Technology, Efficiency and operational parameters, Colors and materials, Types, Considerations for use, Power sources and Electrical pol 23-01-14

This note explains the following topics: LED Development, Structure of High Brightness LED, Materials used in color LEDs, Characteristics of LEDs, Temperature effect on LED Parameters, LED Binning, LED Binning, Backlight Applications, Resistor Limiting, Linear Regulation, Buck LED Driving, Using Boost Regulator Parallel LED Connection, Inductive vs Charge Pump Efficiency Comparison, Buck-Boost Driving, LED Dimming and Contrast Ratios, PWM Dimming Control, Controlling Color, Contrast Ratio , LM3404 Delay, tD, Parallel FET Dimming, New LED Driving Tools.

This note covers the following topics: Basic principles of organic light-emitting diodes, Device preparation, materials and stack design, Experimental techniques, Comprehensive efficiency analysis of OLEDs, Degradation processes in OLEDs.

Primary aim of this note is to provide a visual source for high-urgency work that will define the future directions relating to the organic light emitting diode (OLED), with the expectation for lasting scientific and technological impact. The editor hopes that the chapters verify the realization of the mentioned aims that have been considered for editing of this book.

This PDF book covers the following topics related to Organic Light Emitting Diode : Organic light emitting diodes based on functionalized oligothiophenes for display and lighting applications, The efficient green emitting iridium complexes and phosphorescent organic light emitting diode characteristics, Material Issues in AMOLED, Nanocomposites for Organic Light Emiting Diodes, Carrier Transport and Recombination Dynamics in Disordered Organic Light Emitting Diodes, Solution Processable Ionic p-i-n Organic Light- Emitting Diodes, High-Contrast OLEDs with High-Efficiency, Optimum Structure Adjustment for Flexible Fluorescent and Phosphorescent Organic Light Emitting Diodes, a-Si:H TFT and Pixel Structure for AMOLED on a Flexible Metal Substrate, Organic Light Emitting Diode for White Light Emission.

This note covers the following topics: Current conduction mechanism in LED like structures, Optical output power, Losses and efficiency, Current crowding, Packaging, Perception of visible light and color, Visible light terminology, Inroads by LEDs, Nitride LED performance, On the nature of light emission in nitride based LEDs, LED degradation, LED efficiency, Monochrome applications of LEDs, Luminescence conversion and white light generation with nitride LEDs, Approaches to white light generation, Toward the white light applications and OLED structures.