LED (light emitting diode) is an electronic component which emits electrical light.
In this post, you'll learn about:
You can check the full-color chart here.
In this post, you'll learn about:
- Symbol and construction of LED
- How it works
- How it exhibits different colors
- Resistor & LED Calculations
- Introduction to the 7 Segment LED Display
- Difference between LED and photodiode
Symbol and Construction
It is a two terminal device which contains a pn juction. The two terminals are namely the cathode and the anode. Manufacturers indicate the cathode by keeping it longer in length as compared to the anode.
How it works
During forward bias the electrons from n region cross the pn junction and combine with holes in p region. Electrons are at higher energy level than holes and this energy difference results as the visible light. During combination process, the electrons release energy in the form of photons.
How it exhibits different colors
The color of light emitting diode depends on the wavelength of emitted light. This wavelength depends on the material used during the manufacturing process. Different materials are added in different proportions for achieving the colors. The details below presents a summarized review of colors and bandwidth.
Color | Wavelength (nm) | Forward voltage (V) | Material |
---|---|---|---|
Infrared | 850-940 | 1.7-1.5 | GaAIAs (Gallium Aluminum Arsenide) |
Red | 633 | 2.2 | InGaAIP (Indium Gallium Aluminum Phosphide) |
Orange | 605 | 2.1 | GaP (Gallium Phosphide) |
Yellow | 585 | 2.1 | GaAsP (Gallium Arsenic Phosphide) |
Green | 555 | 2.1 | GaP (Gallium Phosphide) |
Blue green | 505 | 3.5 | SiC (Silicon Carbide) |
Blue | 430 | 3.8 | SiC (Silicon Carbide) |
Resistor and LED Calculation
A Simple circuit
Let's consider that you are using a green LED rated at 2.1 V and 20 mA. The input is a 12 V battery which powers the circuit. Using Ohm's law we can find the value of resistor as shown below:
The same procedure of calculation extends for all types of resistors you just need add leds and then perform the calculations.
7 Segment LED Display
The 7 segment LED display is a combination of LEDs connected in different arrangments.
Difference between LED and Photodiode
LED is a light emitting diode which operates in the forward bias condition, whereas the photodiode is a sensor diode which operates in the reverse bias direction. Originally the resistance of photodiode is very high. The incident light falls on the diode and decreases the resistance thus facilitating the reverse current flow. Symbols of both components are same with the difference being arrow directions are reversed.
So that was all about basics of LED.
Learn more about:
So that was all about basics of LED.
Learn more about:
Much obliged for making the page! Im positive that it will be extremely mainstream. It has great and significant substance which is exceptionally uncommon nowadays.
ReplyDeleteledmodules.com
Thanks a lot for sharing us about this update. Hope you will not get tired on making posts as informative as this. Katon Redgen Mathieson
ReplyDeleteThe product companies can hence advertise their products or any sort of upcoming product launches, providing discounts on their varied product listings. LED display
ReplyDeleteThankyou for this wondrous post, I am glad I observed this website on yahoo. led ceiling track lights
ReplyDeleteThanks for the valuable information and insights you have so provided here... best led track lighting
ReplyDeleteI love the numerous blogposts, We critically loved, I'd like information about this, because it is quite fantastic., Regards regarding indicating. led panel light
ReplyDeleteNo idea about the power. I will try measuring the current drain using an ammeter. Again no idea about the lux. I couldnt find the datasheets of the LEDs used in this panel.led panel light
ReplyDeleteI wanted to thank you for this excellent read!! I definitely loved every little bit of it. I have you bookmarked your site to check out the new stuff you post led light panel
ReplyDeleteNakashi brings the latest design and innovative techniques together to manufacture the world's most effective and quality-driven Led Wall light in Dubai. The perfect lightning solutions really act as anenergy-saving solution for the clients. We ensure to deliver the best LED products to fulfil the demands of our customers.
ReplyDeleteThank you because you have been willing to share information with us. we will always appreciate all you have done here because I know you are very concerned with our.
ReplyDeletehigh voltage diodes
Nakashi offers the best Motion Sensor Led Light in Dubaifor various commercial and residential purposes. These lights include automatic sensor and even consume less amount of energy. Adapt the advancement and choose the innovative solution for your indoor and outdoor zones.
ReplyDeleteIn this case you will begin it is important, it again produces a web site a strong significant internet site: entryway chandelier
ReplyDeleteI am interested in such topics so I will address page where it is cool described. Advance-Esthetic
ReplyDelete