Two-dimensional temperature distribution measurement of light-emitting diodes by micro-hyperspectral imaging-based...

Area of Science:

• Optoelectronics
• Thermal Management
• Advanced Measurement Techniques

Background:

• Accurate temperature monitoring is crucial for light-emitting diode (LED) performance and longevity.
• Existing methods like thermocouples and infrared imaging have limitations in spatial resolution or contact requirements.
• Understanding 2D temperature distribution is key to optimizing LED design and preventing thermal issues.

Purpose of the Study:

• To develop and validate a non-contact method for precise 2D temperature mapping of LEDs.
• To leverage micro-hyperspectral imaging and reflected light for enhanced thermal measurement.
• To compare the proposed method against established techniques for accuracy and resolution.

Main Methods:

• Utilized micro-hyperspectral imaging combined with the reflected light method for non-contact temperature measurement.
• Employed blue and green bare LEDs as test samples, illuminated by red and near-infrared LEDs to prevent spectral overlap.
• Applied convolution linear filtering algorithms during data processing to enhance measurement accuracy.

Main Results:

• The proposed non-contact method demonstrated good agreement with micro-thermocouple and infrared thermal imaging techniques.
• Achieved a significant improvement in spatial resolution for 2D temperature distribution, exceeding thermal imaging by at least an order of magnitude.
• Successfully mapped the 2D temperature distribution of bare blue and green LEDs.

Conclusions:

• The developed micro-hyperspectral imaging-based method offers a highly accurate and efficient non-contact solution for 2D LED temperature measurement.
• This technique provides superior spatial resolution compared to conventional infrared thermal imaging.
• The findings contribute to advanced thermal management strategies for optoelectronic devices.