Abstract
By directly flip-chip soldering three mid-power light-emitting diode (LED) chips with periodic micro-via-holes on ceramic substrates, -3 dB modulation bandwidths of 49.9MHz, 58.8MHz, and 25MHz are obtained at the driving current of 170mA. To the best of our knowledge, these are the reported highest -3 dB bandwidth values for flip-chip power-type LEDs (FC-LEDs) at the low-bias current levels. Moreover, good radiant powers are also achieved: 180.2mW, 168.8mW, and 233.8mW at 150mA, respectively. With a gold wire-free feature, the fabricated FC-LEDs could offer an opportunity to miniaturize the package volume of a LED module for illumination and free-space high-speed VLC dual-usage applications.
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