2025-12-01

In-depth Analysis of Failure Mechanisms in LED Chips and Packaging

author: Like Light

With the rapid development of LED technology, its application in the lighting field has become increasingly widespread. LEDs, with their advantages of high efficiency, energy saving, and environmental friendliness, are regarded as substitutes for traditional lighting technologies. However, LED products still face many challenges in practical applications, especially issues related to stability and reliability. This article explores the causes of LED chip failure and packaging failure, and analyzes the underlying physical mechanisms. As a scientific research and testing institution focusing on the LED industry, Jinjian Laboratory is committed to improving LED quality, serving all links in the LED industry chain, and promoting the healthy development of the LED industry.

Electrostatic Discharge (ESD): Electrostatic discharge is an important factor leading to LED chip failure. ESD events may cause varying degrees of damage to LED chips, which can be divided into soft failure and hard failure. Hard failure is usually caused by extremely high voltage, which may result in physical damage to the internal structure of the LED chip, such as electrolyte breakdown or the formation of new current paths. Soft failure, on the other hand, may be caused by lower voltage/current, usually manifested as a reduction in the reverse leakage current of the chip.
Current: Excessive operating current will increase the junction temperature of the LED chip, leading to a decline in the performance of the internal materials of the chip. High-energy electrons may damage Mg-H bonds and Ga-N bonds, affecting the activity of carriers. Initially, this may cause an increase in optical power, but in the long run, it will lead to optical power attenuation. In addition, current crowding is more severe in areas with a higher density of internal defects in the chip, which may cause metal electromigration and further lead to LED chip failure.
Temperature: Temperature has multiple effects on LED chips. Firstly, as temperature rises, the internal quantum efficiency decreases, resulting in a reduction in light output. Secondly, high temperatures may accelerate material aging, affecting ohmic contacts and the performance of internal materials of the chip. Furthermore, high temperatures may cause uneven temperature distribution inside the chip, generating strain, and reducing internal quantum efficiency and chip reliability.

LED packaging is an important link to protect the LED chip and ensure its normal operation. The main causes of packaging failure include temperature, humidity, and voltage. In the field of LED packaging, Jinjian Laboratory provides one-stop services including failure analysis, covering all links to meet the diversified needs of customers.

Temperature: Temperature has multiple effects on LED packaging. High temperatures will accelerate the aging of packaging materials and reduce their performance. Excessively high junction temperatures may cause the phosphor layer to burn black and carbonize, reducing LED luminous efficiency or leading to catastrophic failure. Mismatched thermal conductivity coefficients between packaging materials may cause cracks or interface delamination inside the materials, affecting luminous efficiency.
Humidity: The intrusion of moisture may lead to a decrease in LED luminous efficiency or even catastrophic failure. In high-temperature and high-humidity environments, moisture plays an important role in the formation of delamination defects, which cause a decline in LED luminous efficiency.