Title :
Analysis of Current Components and Estimation of Internal Quantum Efficiency in Light-Emitting Diodes
Author :
Lee, Jae-Man ; Kim, Sang-Bae
Author_Institution :
Dept. of Electr. & Comput. Eng., Ajou Univ., Suwon, South Korea
Abstract :
We have decomposed light-emitting diode (LED) current into component currents by identifying the ideality factor of each component and by fitting the measured and simulated current-voltage ( I-V ), I(dV/dI)-I and the shape of the relative luminescence efficiency-current characteristics. Nearly unity ideality factor of the radiative recombination current is found from luminescence-voltage (L- V) characteristics in AlGaInP red and GaInN green and blue LEDs. The current-component analysis enables an estimation of the internal quantum efficiency (IQE) as a function of current. Compared with red LEDs, blue LEDs suffer from lower radiative recombination efficiency and much larger efficiency droop to result in lower IQE.
Keywords :
III-V semiconductors; aluminium compounds; gallium compounds; light emitting diodes; AlGaInP; LED; current components analysis; internal quantum efficiency; light-emitting diodes; luminescence-voltage characteristics; radiative recombination current; relative luminescence efficiency-current characteristic; Current measurement; Estimation; Gallium nitride; Light emitting diodes; Radiative recombination; Semiconductor device measurement; Tunneling; Current components; current–voltage ( $I$–$V$) characteristics; light-emitting diodes (LEDs); quantum efficiency;
Journal_Title :
Electron Devices, IEEE Transactions on
DOI :
10.1109/TED.2011.2158826
