Question
Download Solution PDFAs the colour varies, forward voltage varies, in:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF- A light-emitting diode (LED) is a semiconductor device that emits light when current flows through it.
- As the color varies, the forward voltage varies, in LED.
- Typically, the forward voltage of an LED is between 1.8 and 3.3 volts.
- “White” LED has a high voltage, typically 3.2 - 3.6V.
Various LED's with their color and voltage drop are as follows:
| Semiconductor Material | Wavelength | Colour | Voltage Drop (Forward) |
| GaAs | 850 - 940 nm | Infra - red | > 1.9 V |
| GaAsP | 630 - 660 nm | Red | 1.8 V |
| GaAsP | 605 - 620 nm | Amber | 2.05 V |
| GaAsP:N | 585 - 595 nm | Yellow | 2.15 V |
| AlGaP | 550 - 570 nm | Green | 2.2 V |
| SiC | 430 - 505 nm | Blue | 2.6 V |
| GaInN | 450 nm | White | 3.5 V |
Last updated on Jun 2, 2025
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