Electroluminescence comparison of photonic crystal light-emitting diodes with random and periodic hole structure
Kim, Sang-Mook; Kim, Ki Seok; Jung, Gun Young; Baek, Jong Hyeob; Jeong, Hyun; Jeong, Mun Seok; Kim, Sang-Mook; Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea; Korea Photonics Technology Institute (KOPTI), Gwangju 500-460, Korea; Kim, Ki Seok; Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea; Jung, Gun Young; Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea;; Baek, Jong Hyeob; Korea Photonics Technology Institute (KOPTI), Gwangju 500-460, Korea; Jeong, Hyun; Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, 500-712, Gwangju, Korea; Jeong, Mun Seok; Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, 500-712, Gwangju, Korea
Журнал:
Journal of Physics D: Applied Physics
Дата:
2009-08-07
Аннотация:
We compare the characteristics of photonic crystal (PC) light-emitting diodes (LEDs) with the same hole pattern density of 12 ea µm<sup>−2</sup>. The PC LED with periodic hole structure demonstrated an increased output power, improved external efficiency at high current operation and uniform radiation owing to the periodic nanoscale features generating a photonic band gap (PBG), when compared with those of the random hole (RH) LED. The electroluminescence images obtained by confocal scanning electroluminescence microscopy (CSEM) show the difference of light emission propagation from the random and periodic structures.
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