A system and a method to measure the junction temperature of LEDs


Optik, vol.235, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 235
  • Publication Date: 2021
  • Doi Number: 10.1016/j.ijleo.2021.166655
  • Journal Name: Optik
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Communication Abstracts, INSPEC
  • Keywords: LED, Junction temperature, Measuring method
  • Bursa Uludag University Affiliated: Yes


© 2021 Elsevier GmbHIn this study, a new method of measuring LED junction temperature is given. The linear relative radiant power/temperature variation has been utilized in this method. This method can be applied at pulsed high currents of LED. The measurement system used here consists of a pulse oscillator, an appropriate LED driving circuit and a photodetector circuit. A photodetector voltage, which is proportional to the radiant power of LED, has been measured by using an oscilloscope, and junction temperature have been determined by making easy calculations on it. A constant, which is obtained from linear relative radiant power/junction temperature characteristics, has been used in this calculation.