How to Properly Distinguish the Quality of LED Chip-On-Board (COB) LEDs

Release Date:

2022-08-01

　　

　　As electronic products, smart devices, 5G, IoT technologies, and basic electronic components are propelled into a phase of rapid transformation and development, Youwei Optoelectronics manufactures LED chip LED chip beads are also highly favored in the electronics industry, with models such as 0807 RGB with IC, 2835 RGB, and 5054 RCB with IC emerging as best-selling products. So how do we distinguish the quality of surface-mount LED chip beads?

　　

LED chip


　　1. Differences in lamp bracket materials: Currently, the market offers aluminum brackets and red-copper brackets. Aluminum brackets are inexpensive, while red-copper brackets cost more than ten times as much. Even among red-copper brackets, the price can vary depending on whether they are silver-plated; those with higher-quality silver plating are often referred to as “premium brackets,” though most such brackets are actually brass with a silver finish.

　　2. Differences in bonding materials: The chip and the lead frame are interconnected via gold wire bonding. Currently, both alloy wire and pure gold wire are available on the market; pure gold wire is superior. Xinwei Optoelectronics uses pure gold wire in diameters of 0.7 mm, 0.9 mm, 1.0 mm, and 1.2 mm, among others. Generally, the thicker the gold wire, the lower the thermal resistance and the longer the service life. Therefore, it is essential to inquire about the material and diameter of the gold wire.

　　3. Differences in chip size: Chip sizes reported in mils are usually difficult to distinguish. Generally, the larger the chip, the brighter it is. We can compare chip sizes by calculating their areas; using chip area as a criterion is an effective way to differentiate chip sizes. LED chip mounting

　　4. Differences in phosphors: White-light LEDs are produced by combining a blue LED chip with yellow phosphor. Phosphors are mainly classified into aluminates and silicates. Aluminates, exemplified by YAG, offer stable performance and low light depreciation, whereas silicates have poorer chemical stability but higher brightness. To develop products with stable performance, one must not be misled by claims of “high brightness”—this is a critical issue.

　　5. Differences in adhesives: Phosphor must be mixed with adhesive before being applied to the chip; low-quality adhesives will yellow over time, leading to increased light depreciation, whereas high-quality adhesives are jelly-like.

　　6 LED chip Electrode diagram of the LED chip: The quality of surface-mount LED chips varies depending on the chip manufacturer. Suppliers of surface-mount LEDs typically state that their products are packaged using branded chips. However, once white-light LEDs are encapsulated, it is impossible to determine the chip manufacturer simply by visual inspection; the chip must be carefully removed and examined under a high-magnification microscope.

　　That’s all for today—no further introductions. Thank you for watching. If you’re in need of surface-mount assembly services, please don’t hesitate to contact our factory. We are a professional manufacturer with distinct advantages in both pricing and quality when it comes to custom products. Feel free to call us for more information. Until next time!


More information

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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.

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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.