After the brightness and energy efficiency are gradually improved, extending the service life has become a new requirement for accelerating the development of high-brightness light-emitting diode (HB LED ) solid-state lighting. By properly selecting electrostatic discharge (ESD) protection components and optimizing circuit design, HB LED solid-state lighting module manufacturers will effectively extend product life and achieve superior quality.
As brightness and energy efficiency increase, extending the lifespan has become one of the keys to the rapid development of solid-state lighting designs based on high-brightness light-emitting diodes (HB LEDs). However, not all HB LEDs are comparable in these respects, and the way manufacturers apply electrostatic discharge (ESD) protection may be a key factor influencing the lifetime of HB LEDs. This article will explore the importance of ESD protection and explain that HB LED module manufacturers use state-of-the-art protection technology to ensure their designs maximize their lifetime and quality potential.
Emerging hidden threat signal
The commercialization of green and blue LEDs, combined with the steady and rapid increase in the average light output of each component achieved in recent years, opens up a large number of new application markets for solid-state lighting. The price and performance of HB LEDs has surpassed Haitz's Law (similar to Moore's Law for transistor density), according to which the light output level of LEDs doubles every 2 years, with an average of light per lumen. The cost of output is reduced by a factor of ten every 10 years.
In fact, the light output of LEDs is now doubled every 18 months (or even shorter), and today there are components with a luminous efficiency of 120 lumens per watt, and leading laboratories even demonstrate luminous efficiency up to watts per watt. 200 lumens of LED. HB LED's light output capability and cost are greatly improved, and it is also vulnerable to serious damage due to ESD, just like today's advanced integrated circuits (ICs).
IC manufacturers have identified ESD damage as a major threat to the field reliability of complementary metal-oxide-semiconductor (CMOS) components, which can damage the brand image and hinder the market from accepting new technologies. To avoid this situation, the industry is actively striving to optimize the integration of ESD protection architecture with subsequent new process generations. Similarly, leading HB LED manufacturers have identified ESD as a significant threat to solid-state lighting opportunities and collaborate with ESD experts to develop appropriate protections. As the total light output increases to provide exciting themes, numerous effective ESD protection measures have emerged and have been incorporated into already-marketed HB LEDs by well-known manufacturers.
HN LED is susceptible to ESD damage
Integrating the sapphire substrate with the epitaxial wafer used to make the green and blue emitters results in components that are more susceptible to ESD damage than red LEDs. Since the sapphire substrate is a pure insulator, a large amount of electrostatic charge is accumulated when processing components during production. In addition, the epitaxial layer is more susceptible to ESD damage than the epitaxial layer used in the manufacturing process of red LEDs, most likely due to effects such as defects in the manufacturing process.
ESD will help extend the life of HB LEDs and accelerate adoption.
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