What is the light-emitting principle of LED chips?

Release Date:

2021-11-28

　　An LED chip is a light-emitting diode, and an LED bulb is simply the common, colloquial term for an LED.

　　 LED light bead What is the principle of luminescence? Let’s analyze it together below.

　　

LED light bead

 

　　The terminal voltage across the PN junction of an LED chip creates a potential barrier. When the forward bias voltage is applied, the majority carriers in the P-region and N-region diffuse into the opposite region. Because the electron mobility is much higher than the hole mobility, a large number of electrons diffuse into the P-region, effectively injecting minority carriers into that region. These electrons then recombine with the holes in the P-region, and the energy released during recombination is emitted as light. This is the fundamental principle behind light emission in a PN junction.

　　 LED light bead What categories are there? Let’s analyze them together below.

　　1. Embedded low-power specifications include straw-hat/helmet, round-head, concave, elliptical, square (2×3×4) bullet, flat-head, and piranha types (3/5/flat-head/bread-shaped), among others.

　　2. SMD patches are generally categorized as (3020, 3528, 5050—these are full-view LEDs—), 1016, 1024, and so on.

　　3. High-power LEDs cannot be categorized as the patch series; their power ratings and current requirements differ, and their optoelectronic parameters vary significantly. A single high-power LED light source, if mounted on an uncooled heat sink (typically a hexagonal aluminum base), is not substantially different from a conventional surface-mount device. High-power LED light sources are generally circular and, in principle, use the same SMD packaging method as standard SMDs; however, they differ fundamentally from SMDs in terms of operating conditions, environmental factors, and performance characteristics.

　　 LED light bead What are its characteristics? Let’s analyze them together below.

　　1. Voltage: LED bulbs operate on low-voltage power supplies, typically ranging from 2 to 4 volts depending on the specific product. This makes them safer than high-voltage power sources, particularly in public spaces.

　　2. Current: The operating current is 0–15 mA; as the current increases, the brightness also increases.

　　3. Efficiency: Energy consumption is 80% lower than that of incandescent lamps, with comparable luminous efficiency.

　　4. Versatility: Very high. Each LED chip in the module is a 3–5 mm square, allowing for the creation of components in a wide variety of shapes, making it ideally suited to dynamic and ever-changing environments.

　　5. Response Time: The response time of an incandescent lamp is in milliseconds, while that of an LED lamp is in nanoseconds. LED chip

　　6. Environmental pollution: No harmful mercury.

　　7. Color: Changing the current alters the color. By employing chemical modification techniques, the band structure and bandgap of the material in light-emitting diodes can be easily tuned, enabling multi-color emission in red, yellow, green, and orange. For instance, a low-current red LED will shift to orange as the current increases, then to yellow, and finally to green.

　　What is the service scope of LED light beads? Let’s analyze this together below.

　　LED bulbs are widely used in a variety of applications, including general lighting, LED screen displays, signal lights, decorative lighting, computers, electronic toys and gifts, switches, telephones, advertising, and urban lighting projects.

More information

What is a light-emitting diode?

Light-emitting diodes are commonly referred to as LED beads. They are used in a wide range of applications and can be seen on streets and in alleys everywhere. For example, traffic lights at intersections remind people to obey traffic rules; remote controls transmit or receive signals; they can be used to display images on ultra-large screens; and various streetlights provide warm illumination at night. Even everyday household appliances rely on their contributions.

What are the tips for selecting LED chips?

1. Brightness: LED brightness varies, and so does the price. LEDs used in LED lighting must comply with laser safety classification standards.

What factors influence the price differences of LED light beads?

LED chips are a well-known product in the LED industry; however, many people are less familiar with their pricing. What causes such wide variations in LED chip prices? Below, we will outline the factors that influence LED chip prices.

What is the light-emitting principle of LED chips?

An LED chip is a light-emitting diode, and an LED bulb is simply the common, colloquial term for an LED.

Are you familiar with full-color LED chip-on-board modules for side mounting?

The brightness of full-color LED surface-mount devices is closely related to the LED’s viewing angle. The narrower the viewing angle, the higher the brightness; moreover, differences in manufacturing processes can lead to significant variations in service life. For a 5-mm LED with a 180-degree viewing angle, the white-light luminous intensity is only a few hundred mcd, whereas for a 15-degree viewing-angle LED, the luminous intensity exceeds 10,000 mcd. When high-power LEDs are used outdoors, the brightness is even greater. Single-power LEDs include 1 W, 3 W, and 5 W models; some high-power LEDs can be combined to form a single high-power LED with output up to several hundred watts. Color temperature is independent of brightness, but brightness is directly related to the lumen value.

Key Considerations for Full-Color SMD LEDs on the Side

Side-view full-color LED chips, also known as surface-mount LEDs, are a type of simple lighting device. Their light-emitting principle is based on passing an electric current through a compound semiconductor; when electrons and holes recombine, the excess energy is released in the form of light, thereby producing illumination.