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In Depth Analyses of LEDs by a Combination of X-ray Computed Tomography (CT) and Light Microscopy (LM) Correlated with Scanning Electron Microscopy (SEM)
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Non-destructive inspection methods for LEDs using real-time displaying Optical Coherence Tomography.

Nam Hyun Cho1, Unsang Jung, Suhwan Kim

  • 1School of Electrical Engineering and Computer Science, Kyungpook National University, 1370, Sankyuk-dong, Buk-gu, Daegu 702-701, Korea. nhcho@knu.ac.kr

Sensors (Basel, Switzerland)
|November 1, 2012
PubMed
Summary

This study shows Optical Coherence Tomography (OCT) can inspect Light Emitting Diodes (LEDs). OCT imaging reveals defects like wire disconnections, improving on traditional inspection methods.

Keywords:
LEDOCTinspectionnon-destructivereal-time

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Area of Science:

  • Optoelectronics
  • Non-destructive Testing
  • Optical Imaging

Background:

  • Light Emitting Diodes (LEDs) are crucial in modern lighting and displays.
  • Traditional inspection methods for LED defects can be limited in scope and resolution.
  • Optical Coherence Tomography (OCT) offers high-resolution cross-sectional imaging capabilities.

Purpose of the Study:

  • To evaluate the applicability of two OCT technologies for inspecting LED structures.
  • To compare Spectral Domain OCT (SD-OCT) and Swept Source OCT (SS-OCT) for LED defect detection.
  • To demonstrate OCT as a non-destructive method for identifying LED manufacturing defects.

Main Methods:

  • Acquired cross-sectional 2D images of LEDs using SD-OCT (850 nm) and SS-OCT (1,310 nm).
  • Extracted sectional profiles to identify potential wire disconnections.
  • Compared imaging performance of SD-OCT and SS-OCT on the same LED samples.
  • Calculated the volume of fluorophore space from OCT images.

Main Results:

  • SD-OCT (850 nm) provided clearer visualization of fluorescence material distribution.
  • SS-OCT (1,310 nm) offered superior clarity for assessing wire connection status.
  • Both OCT systems successfully identified potential defects in LED structures.
  • Fluorophore space volume was quantitatively assessed using OCT data.

Conclusions:

  • Optical Coherence Tomography is applicable for non-destructive inspection of LED structures.
  • SD-OCT and SS-OCT offer complementary advantages for different aspects of LED inspection.
  • OCT imaging shows potential to enhance inspection efficacy compared to CCD cameras or X-ray instruments.