Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/85047
Title: Humidity effect on the degradation of packaged ultra-bright white LEDs
Authors: Xu, G.
Liu, Y. J.
Foo, Y. Y.
Chan, R. Y.
Tan, Cher Ming
Chen, Eric Boon Khai
Keywords: DRNTU::Engineering::Electrical and electronic engineering::Electronic circuits
Issue Date: 2008
Source: Tan, C. M., Chen, E. B. K., Foo, Y. Y., Chan, R. Y., Xu, G., & Liu, Y. G. (2008). Humidity effect on the degradation of packaged ultra-bright white LEDs. In proceedings of the 10th Electronics Packaging Technology Conference: Singapore (pp.923-928).
Abstract: Many ultra-bright light-emitting diodes (LEDs), especially the white LEDs, are being actively developed for solid-state lighting and many other commercial applications. Hence, it is important to evaluate and understand the failure mechanisms that affect the performance characteristics and lifetimes of these new LEDs. This study concerns the humidity effect on the degradation of GaN-based packaged white LEDs. Under the accelerated humidity test, the LEDs showed a degradation of optical output. With the mixture statistical distribution analysis method, it is noted that the luminous flux degradation of the packaged white LEDs is dependent on more than two failure mechanisms. Two of the failure mechanisms are observed to follow the lognormal distribution. With detailed spectrum analysis and by employing the parameters extraction method, one of the two failure mechanisms that follow the lognormal distribution is observed to be caused by chip related failure due to the accumulated moisture in the encapsulation. For the other failure mechanism, phosphor degradation is noted to be the primary cause.
URI: https://hdl.handle.net/10356/85047
http://hdl.handle.net/10220/6379
DOI: http://dx.doi.org/10.1109/EPTC.2008.4763548
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Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Conference Papers

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