Analysis Of Degradation Effect on Deep-Ultraviolet Leds

Deep-ultraviolet light has a wide application range in daily life, such as the disinfection of water and surfaces of objects without any pollution. At the meanwhile, Light Emitting Diodes (LEDs) are fantastic light emitting devices with multiple advantages, such as high efficiency and relatively longer lifespan. Therefore, the invention of Deep-Ultraviolet LEDs (DUV-LEDs) is reasonable since it can make use of the advantages of LEDs for a lower cost in applications. However, not everything goes well with DUV-LEDs. Degradation greatly affects the performance and lifespan of DUV-LEDs. The efficiency and output power of DUV-LEDs would decrease dramatically after aging. In this passage, current, heat and defects are three main reasons of degradation and each of them are discussed in detail. The effect of degradation on I-V characteristics is included to present more detailed information. A newly developed manufactural method with graphene is mentioned, and suggestions and further research directions are provided to improve the lifespan and reliability of DUV-LEDs.