The life of the lamp bead is a topic of common concern for developers and consumers. A good product, its life must be within a reasonable range, to meet people’s needs.
Therefore, when designing LED lighting, designers must not only ensure the performance of LED products, but also ensure the life of LED products. This requires adjustment of some parameters during the design process. This article will introduce those parameters and LED lamp beads. Life related.
Generally, the operating temperature of a semiconductor current device determines the lifetime of the device. Many high-power transistors in an electronic device are fixed on a rate heat sink. The life of the LED lamp bead mainly depends on the operating temperature. The life of the lamp bead can generally be expressed as a lamp. Bead failure (not lit) and light decay (lower luminous flux).
The main factor affecting the life of LED lamp bead is light decay. The light decay is expressed by the luminous flux maintenance rate. Generally, during the warranty period, the light attenuation cannot be lower than 30% of the initial luminous flux. The parameters related to lamp life are:
- Ambient temperature and working temperature. Under the same heat dissipation conditions, the higher the environment and working temperature, the shorter the life of the lamp bead.
- The smaller the drive current, the longer the life of the lamp bead.
- The better the quality of the packaging material, the longer the life of the lamp bead.
- The higher the efficiency of the heat dissipation structure, the longer the life of the lamp bead.
- The higher the level of static protection of the chip and package, the longer the life of the lamp bead.
The life of LED lamp beads is closely related to these factors. In order to fully extend the life of the lamp, it is necessary to pay attention to the changes of these factors.
How to improve light extraction efficiency of UV LEDs?
UV LEDs are often used in the medical field, also known as medical violet LED, in a deep ultraviolet light emitting diode plated only 5 nanometers thin aluminum, the aluminum film is not only not the same as the one issued on the device like a traditional mirror more light reflected back to the side of the device but skillfully emitted light was collected through the aluminum layer, magically shot from the front, to achieve the light extraction efficiency. This is because after doing when aluminum is very thin, which makes it different from the traditional effect of nano-mirror reflects the light back, but concentrated absorption of light collection and achieve positive emission.
Tests showed that this layer of aluminum “coat” of ultraviolet light-emitting diode light extraction efficiency “contribution” will vary with different wavelengths and different. Generally speaking, the shorter the wavelength, the higher the efficiency. Data show that, with this layer is coated with an aluminum film, a wavelength of about 310 nm ultraviolet light emitting diodes, light extraction efficiency can be increased by about 20%; a wavelength of about 290 nm ultraviolet light emitting diodes, light extraction efficiency can be increased by about 50%; and for a wavelength of about 280 nm deep-UV LEDs, the light extraction efficiency can be increased by 130%.
In general, in order to extend the life of the LED lamp bead, it is necessary to avoid a high temperature working environment and select a product with a smaller driving current. In addition, the packaging material is also a more important part, which can ensure the protection level of static electricity, thus ensuring the life of the lamp bead.
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