"" internal quantum efficiency is not high, that is, when electrons and holes recombine and generate photons are not 100%, often referred to by the "current leakage" of carriers leaving the PN zone composite rate reduced. Leakage current times voltage is this part of the power, which is converted into heat, but this part does not account for the main component, because the internal photon efficiency is close to 90%.
"" can not be generated inside of photons emitted to the outside of the chip and all the final conversion to heat, partly "" mainly because the current is called an external quantum efficiency of only 30% so, most of the heat is converted into a.
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