Life of LED-Based White Light Sources

被引：560

作者：

Narendran, Nadarajah ^{[1
]}

Gu, Yimin ^{[1
]}

机构：

[1] Rensselaer Polytech Inst, Lighting Res Ctr, Troy, NY 12180 USA

来源：

JOURNAL OF DISPLAY TECHNOLOGY | 2005年 / 1卷 / 01期

关键词：

Degradation; life; light source; white light-emitting diode (LED);

D O I：

10.1109/JDT.2005.852510

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Even though light-emitting diodes (LEDs) may have a very long life, poorly designed LED lighting systems can experience a short life. Because heat at the p-n-junction is one of the main factors that affect the life of the LED, by knowing the relationship between life and heat, LED system manufacturers can design and build long-lasting systems. In this study, several white LEDs from the same manufacturer were subjected to life tests at different ambient temperatures. The exponential decay of light output as a function of time provided a convenient method to rapidly estimate life by data extrapolation. The life of these LEDs decreases in an exponential manner with increasing temperature. In a second experiment, several high-power white LEDs from different manufacturers were life-tested under similar conditions. Results show that the different products have significantly different life values.

引用

页码：167 / 171

页数：5

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