Maintenance of stable light emission in high power LEDs

Hung Yu Chou; Cheng Chien Chen; Tsung Hsun Yang

doi:10.1016/j.microrel.2012.02.002

Maintenance of stable light emission in high power LEDs

Hung Yu Chou, Cheng Chien Chen, Tsung Hsun Yang

Department of Optics and Photonics

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

As well known, the light emission characteristics of the high power light-emitting diodes (LEDs) are very sensitive to the various driving conditions, especially the injected electric current and the junction temperature in operation. In this work, the dependency of the emission light from high power LEDs upon the driving electric current and the junction temperature will be explored in details. One integrated measurement system is proposed for the study in simultaneously obtaining all the thermal-optic- electric characteristics of LEDs throughout the measuring. Based on the basic feedback control methodology, one simple maintaining procedure is applied for the stable light emission in high power LEDs. It shows the robustness of the maintaining procedure from the environment change with the least heat dissipation in the operation of the high power LEDs. The results imply that all the thermal, the optic, and the electric properties of the high power LEDs should be taken into consideration in the same time rather than separately when maintaining their operation.

Original language	English
Pages (from-to)	912-915
Number of pages	4
Journal	Microelectronics Reliability
Volume	52
Issue number	5
DOIs	https://doi.org/10.1016/j.microrel.2012.02.002
State	Published - May 2012

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10.1016/j.microrel.2012.02.002

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title = "Maintenance of stable light emission in high power LEDs",

abstract = "As well known, the light emission characteristics of the high power light-emitting diodes (LEDs) are very sensitive to the various driving conditions, especially the injected electric current and the junction temperature in operation. In this work, the dependency of the emission light from high power LEDs upon the driving electric current and the junction temperature will be explored in details. One integrated measurement system is proposed for the study in simultaneously obtaining all the thermal-optic- electric characteristics of LEDs throughout the measuring. Based on the basic feedback control methodology, one simple maintaining procedure is applied for the stable light emission in high power LEDs. It shows the robustness of the maintaining procedure from the environment change with the least heat dissipation in the operation of the high power LEDs. The results imply that all the thermal, the optic, and the electric properties of the high power LEDs should be taken into consideration in the same time rather than separately when maintaining their operation.",

author = "Chou, {Hung Yu} and Chen, {Cheng Chien} and Yang, {Tsung Hsun}",

note = "Funding Information: This wok was partly sponsored by the National Science Council, Taiwan, under the Grant Nos. of NSC 100–3113-E-008–001 and NSC 101–2911-I-008–501, and also partly sponsored by National Central University, Taiwan, under the Grant No. of 100G903–2. ",

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AU - Chou, Hung Yu

AU - Chen, Cheng Chien

AU - Yang, Tsung Hsun

N1 - Funding Information: This wok was partly sponsored by the National Science Council, Taiwan, under the Grant Nos. of NSC 100–3113-E-008–001 and NSC 101–2911-I-008–501, and also partly sponsored by National Central University, Taiwan, under the Grant No. of 100G903–2.

PY - 2012/5

Y1 - 2012/5

N2 - As well known, the light emission characteristics of the high power light-emitting diodes (LEDs) are very sensitive to the various driving conditions, especially the injected electric current and the junction temperature in operation. In this work, the dependency of the emission light from high power LEDs upon the driving electric current and the junction temperature will be explored in details. One integrated measurement system is proposed for the study in simultaneously obtaining all the thermal-optic- electric characteristics of LEDs throughout the measuring. Based on the basic feedback control methodology, one simple maintaining procedure is applied for the stable light emission in high power LEDs. It shows the robustness of the maintaining procedure from the environment change with the least heat dissipation in the operation of the high power LEDs. The results imply that all the thermal, the optic, and the electric properties of the high power LEDs should be taken into consideration in the same time rather than separately when maintaining their operation.

AB - As well known, the light emission characteristics of the high power light-emitting diodes (LEDs) are very sensitive to the various driving conditions, especially the injected electric current and the junction temperature in operation. In this work, the dependency of the emission light from high power LEDs upon the driving electric current and the junction temperature will be explored in details. One integrated measurement system is proposed for the study in simultaneously obtaining all the thermal-optic- electric characteristics of LEDs throughout the measuring. Based on the basic feedback control methodology, one simple maintaining procedure is applied for the stable light emission in high power LEDs. It shows the robustness of the maintaining procedure from the environment change with the least heat dissipation in the operation of the high power LEDs. The results imply that all the thermal, the optic, and the electric properties of the high power LEDs should be taken into consideration in the same time rather than separately when maintaining their operation.

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DO - 10.1016/j.microrel.2012.02.002

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Maintenance of stable light emission in high power LEDs

Abstract

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