Analysis of Current Components and Estimation of Internal Quantum Efficiency in Light-Emitting Diodes

作者：Lee Jae Man^*; Kim Sang Bae

来源：IEEE Transactions on Electron Devices, 2011, 58(9): 3053-3057.

DOI：10.1109/TED.2011.2158826

• Current components
• current-voltage (I-V) characteristics
• light-emitting diodes (LEDs)
• quantum efficiency

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.

• 出版日期2011-9