Dynamic response-based LEDs health and temperature monitoring

Anton Alexeev; Jean Paul Linnartz; Grigory Onushkin; Kumar Arulandu; Genevieve Martin

doi:10.1016/j.measurement.2020.107599

Dynamic response-based LEDs health and temperature monitoring

Anton Alexeev (Corresponding author), Jean Paul Linnartz, Grigory Onushkin, Kumar Arulandu, Genevieve Martin

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

12 Citations (Scopus)

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Abstract

This paper presents a number of novel methods to measure the junction temperature and to estimate the health of gallium nitride light-emitting diodes (LEDs). The methods are based on measurements of the dynamic impedance and optical output. Our experimental analysis reveals temperature sensitive parameters of the electrical and optical responses. Moreover, a correlation between the non-radiative current characterizing the active region defects and the small-signal impedance is shown. The demonstrated methods can be applied to enhance existing temperature-monitoring techniques. The derived dependencies also build a foundation for advanced in-field health monitoring of the LEDs using the infrastructure of visible light communication systems. Such methods and techniques are valuable for predictive maintenance of solid state lighting systems.

Original language	English
Article number	107599
Number of pages	8
Journal	Measurement: Journal of the International Measurement Confederation
Volume	156
DOIs	https://doi.org/10.1016/j.measurement.2020.107599
Publication status	Published - May 2020

Funding

The contribution of European Union is acknowledged for supporting the study in the context of the ECSEL Joint Undertaking program #692465 (2016?2019). Additional information available on: www.DELPHI4LED.eu.

Funders	Funder number
Horizon 2020 Framework Programme	692465
European Commission
Electronic Components and Systems for European Leadership

Keywords

Defects
Electrical response
Failure modes
Impedance
LED
Optical response
OWC
Reliability
Smart driver
Temperature

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abstract = "This paper presents a number of novel methods to measure the junction temperature and to estimate the health of gallium nitride light-emitting diodes (LEDs). The methods are based on measurements of the dynamic impedance and optical output. Our experimental analysis reveals temperature sensitive parameters of the electrical and optical responses. Moreover, a correlation between the non-radiative current characterizing the active region defects and the small-signal impedance is shown. The demonstrated methods can be applied to enhance existing temperature-monitoring techniques. The derived dependencies also build a foundation for advanced in-field health monitoring of the LEDs using the infrastructure of visible light communication systems. Such methods and techniques are valuable for predictive maintenance of solid state lighting systems.",

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Dynamic response-based LEDs health and temperature monitoring

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