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Current spreading and thermal effects in blue LED dice
K.A. Bulashevich, I.Yu. Evstratov, V.F. Mymrin, S.Yu. Karpov
Published in: phys. stat. solidi (c) 4, No. 1, 4548 (2007) / DOI 10.1002/pssc.200673502 (11)
We have applied simulations to study current the spreading and heat transfer in blue III-nitride lightemitting diodes (LEDs) with the focus on self-heating and its effect on the device characteristics. A conventional planar design of an LED die is considered for the heat sink through a sapphire substrate. The computations predict a great current crowding at the contact electrode edges, resulting in a non-uniform temperature distribution over the die. The thermal effect on the current-voltage characteristic, output optical power, and series resistance of the diode is analyzed and the theoretical predictions are compared with available observations.
 
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