Electronic Materials Letters

, Volume 6, Issue 2, pp 51–53 | Cite as

Characteristics of blue and ultraviolet light-emitting diodes with current density and temperature

  • Jaehee Cho
  • Euijoon Yoon
  • Yongjo Park
  • Woo Jin Ha
  • Jong Kyu Kim


Temperature and injection-current dependencies of radiant flux from blue and ultraviolet GaInN/GaN multiple quantum well (MQW) light-emitting diodes (LEDs) were investigated. Experimental results indicate that, compared to blue LEDs, the radiative efficiency of ultraviolet LEDs is relatively insensitive to injection current. It is expected that shallow potential minima caused by indium fluctuation in high-indium-containing GaInN quantum wells for blue LEDs result in a high radiative efficiency at low injection currents due to the localization of carriers; however, the radiative efficiency decreases rapidly with increasing injection current due to the delocalization of carriers.


light-emitting diodes efficiency droop carrier localization 


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Copyright information

© The Korean Institute of Metals and Materials and Springer 2010

Authors and Affiliations

  • Jaehee Cho
    • 1
  • Euijoon Yoon
    • 1
  • Yongjo Park
    • 2
  • Woo Jin Ha
    • 3
  • Jong Kyu Kim
    • 3
  1. 1.Department of Materials Science and Engineering and Inter-university Semiconductor Research CenterSeoul National UniversitySeoulKorea
  2. 2.LED Laboratory, R&D CenterSamsung LED Co.SuwonKorea
  3. 3.Department of Materials Science and EngineeringPohang University of Science and Technology (POSTECH)Pohang-si, GyeongbukKorea
  4. 4.Electrical, Computer, and Systems Engineering DepartmentRensselaer Polytechnic InstituteTroyUSA

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