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: 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.
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 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.
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.
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 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.
Author(s): Sebastian Reineke, Michael Thomschke
and Bjorn Lussem, Karl Leo