Physics.pptx

Vi characteristics of Light Emitting Diode

1. Study the VI Characteristics of Light Emitting Diode Light emitting diodes (LEDs) are semiconductor light sources that emit light when a sufficient voltage is applied. Understanding their VI characteristics is critical to optimizing their performance. Let's dive in! by Vishnuvardhan VV

2. Introduction to Light Emitting Diodes 1 What are LEDs? Light emitting diodes (LEDs) are semiconductor devices that emit light when an electric current passes through them. They're widely used in lighting. 2 History of LEDs LEDs were first invented in 1962 and were originally used as indicator lights for electronic devices. It took another 30 years for them to become widely used as a source of illumination. 3 Advantages of LEDs LEDs are much more energy-efficient than traditional incandescent or fluorescent bulbs, they last longer, and their light quality is superior.

3. What are VI Characteristics? Definition The VI characteristics of an LED describe the relationship between the current passing through it and the voltage across it. Types of VI Characteristics There are two types of VI characteristics: normal and reverse. Normal VI curves are graphed from the positive terminal while reverse VI curves are graphed from the negative terminal. Units of Measure VI characteristics are usually measured in volts and milliamps.

4. Why are VI Characteristics Important to Understand? Optimizing Performance Understanding VI characteristics is crucial in selecting the right LED for a particular application and designing the circuit for optimal performance. Troubleshooting Circuits VI characteristics can also be used to diagnose problems in circuits and troubleshoot issues related to LED operation. Brightness Control An understanding of VI characteristics can be used to adjust LED brightness and maintain consistent performance in different applications.

5. How are VI Characteristics Graphed? 1 IV Curve Tracer One common way to graph VI characteristics is to use an IV curve tracer, which measures the voltage across and the current through an LED and generates a curve. 2 Plotting Software Another approach is to use specialized software to plot the VI curve based on measurements taken from a circuit using an LED. 3 Manual Graphing VI characteristics can also be graphed manually by measuring current and voltage at several points along a circuit and plotting them on a graph.

6. Factors That Affect LED VI Characteristics 1 Temperature Temperature affects the forward voltage of an LED and can change the shape of the VI curve. 2 Current Increasing the current through an LED can cause it to heat up and change its VI characteristics. 3 Drive Voltage The voltage used to drive an LED can affect its brightness and wavelength, which in turn affects its VI characteristics.

7. Applications and Uses of Light Emitting Diodes Lighting Indoor lighting Outdoor lighting Automotive lighting Signage Backlit signs Electronic billboards LED displays Consumer Electronics Computer monitors and TVs Remote control indicators Wearable technology

8. Conclusion and Summary The Future of Lighting LEDs are an important part of the future of lighting technology, as they offer superior energy efficiency, long life, and excellent light quality. The Importance of Understanding VI Characteristics As an electrical engineer or technician, understanding the VI characteristics of LEDs is critical to optimizing their performance in a wide range of applications. LEDs in Our Lives LEDs are ubiquitous in our daily lives, from the displays on our phones to the traffic signals on our streets.