Long lived high radiance LEDs for fibre optic communications systems

S. Hersee
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Abstract

The degradation of high radiance LEDs has been characterised over a range of operating temperatures. It is shown that the decay is due to two independant mechanisms. The first mechanism relies on the movement of a charged species in the vicinity of the junction region. The second involves the breakdown of the p-side contact, followed by the diffusion of gold to the active region. The latter mechanism is expected to limit the device lifetime to approximately 106hours. An improved p-side metallisation is discussed.
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用于光纤通信系统的长寿命高亮度led
在一系列工作温度下,高亮度led的退化已经被表征。结果表明,这种衰减是由两种独立的机制引起的。第一种机制依赖于结区附近带电物质的运动。第二个过程涉及p侧接触的破裂,随后金扩散到活性区域。后一种机制有望将设备寿命限制在大约106小时。讨论了一种改进的p侧金属化方法。
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