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LED Indication - Discrete

LED (Light Emitting Diode) has been widely used in the field of indication, and the most typical example is the QL205HT, which is a 5mm high intensity LED. It adopts a flat lens design, suitable for surface mount and come in four available colors (red, amber, green and white). This type of LED is primarily used for indicating status, warning and providing feedback in applications which require long-term stability or high moisture resistance.

Application Field

Applications of the QL205HT range from consumer products to industrial machines. Using it to replace traditional incandescent indicators, providing more efficient and reliable solutions, is becoming more and more popular.

QL205HT is relatively easy to integrate into any devices due to its low power requirements and square shape. It is commonly used in the fields of automotive electronics, home appliances, communications, traffic, security and even marine navigational equipment.

Due to its small size of 5mm, QL205HT can be used for ultra-thin displays. Its compact and light weight also makes it applicable in low profile indicators. Last but not least, its Unique Electro Magnetic Compatibility (EMC) makes it ideal for applications requiring EMC protection.

Working Principle

The working principle of the QL205HT is based on the color light emitted by the semiconductor material inside the LED device. The semiconductor material is composed of two layers, and when current passes through these layers, a junction formed, allowing electric charges to flow in one direction and create electrolyte current. This current generates light energy, and the light intensity is determined by the amount of current flowing through the LED. Generally, the maximum amount current of a LED is controlled by the limiting resistor.

In addition, the color and brightness produced by LEDs can be adjusted by changing the semiconductor material used. Different combinations of materials provide different absorption and emission wavelengths, creating distinct light and color characteristics. For example, a combination of AlGaAs and InGaP leads to the emission of red light, while a combination of InGaN and AlGaAs emits green light.

Conclusion

The QL205HT LEDs are the perfect choice for applications requiring long-term reliability, low power requirements and high moisture resistance. Various industries have adopted it due to its small size and light weight, enabling it to be used for ultra-thin displays. Last but not least, its Unique Electro Magnetic Compatibility (EMC) has made it ideal for applications requiring EMC protection.

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