Abstract
Originating from a non-radiative recombination in the active region of a light-emitting diode (LED), the self-heating effect was investigated under continuous wave (cw) operation with a GaInN blue LED. Current–voltage (I–V) characteristics under pulse operation that lacked self-heating were measured and compared with the corresponding I–V measurement under the cw operation. Accordingly, a comparison of the measured I–V curves enabled estimation of the junction temperature of the LED during the cw operation. The junction temperature of the device increased as high as 323K at an input current of 480mA. The operating current showed a weaker temperature dependence in accordance with the bias increase, which is explained by the expansion of the Shockley diode equation.
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