Humidity effect on the degradation of packaged ultra-bright white LEDs

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 performanc...

Full description

Saved in:
Bibliographic Details
Main Authors: Xu, G., Liu, Y. J., Foo, Y. Y., Chan, R. Y., Tan, Cher Ming, Chen, Eric Boon Khai
Other Authors: School of Electrical and Electronic Engineering
Format: Conference or Workshop Item
Language:English
Published: 2010
Subjects:
Online Access:https://hdl.handle.net/10356/85047
http://hdl.handle.net/10220/6379
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-85047
record_format dspace
spelling sg-ntu-dr.10356-850472020-03-07T13:24:45Z Humidity effect on the degradation of packaged ultra-bright white LEDs Xu, G. Liu, Y. J. Foo, Y. Y. Chan, R. Y. Tan, Cher Ming Chen, Eric Boon Khai School of Electrical and Electronic Engineering Electronics Packaging Technology Conference (10th : 2008 : Singapore) A*STAR SIMTech National Metrology Centre DRNTU::Engineering::Electrical and electronic engineering::Electronic circuits 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. Published version 2010-08-31T03:57:51Z 2019-12-06T15:56:10Z 2010-08-31T03:57:51Z 2019-12-06T15:56:10Z 2008 2008 Conference Paper 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). https://hdl.handle.net/10356/85047 http://hdl.handle.net/10220/6379 10.1109/EPTC.2008.4763548 en © 2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. http://www.ieee.org/portal/site This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. 6 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Electrical and electronic engineering::Electronic circuits
spellingShingle DRNTU::Engineering::Electrical and electronic engineering::Electronic circuits
Xu, G.
Liu, Y. J.
Foo, Y. Y.
Chan, R. Y.
Tan, Cher Ming
Chen, Eric Boon Khai
Humidity effect on the degradation of packaged ultra-bright white LEDs
description 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.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Xu, G.
Liu, Y. J.
Foo, Y. Y.
Chan, R. Y.
Tan, Cher Ming
Chen, Eric Boon Khai
format Conference or Workshop Item
author Xu, G.
Liu, Y. J.
Foo, Y. Y.
Chan, R. Y.
Tan, Cher Ming
Chen, Eric Boon Khai
author_sort Xu, G.
title Humidity effect on the degradation of packaged ultra-bright white LEDs
title_short Humidity effect on the degradation of packaged ultra-bright white LEDs
title_full Humidity effect on the degradation of packaged ultra-bright white LEDs
title_fullStr Humidity effect on the degradation of packaged ultra-bright white LEDs
title_full_unstemmed Humidity effect on the degradation of packaged ultra-bright white LEDs
title_sort humidity effect on the degradation of packaged ultra-bright white leds
publishDate 2010
url https://hdl.handle.net/10356/85047
http://hdl.handle.net/10220/6379
_version_ 1681043835996602368