Improvement of the Light Output Power of GaN-Based Vertical Light Emitting Diodes by a Current Blocking Layer

The light output characteristics of GaN-based vertical light emitting diodes fabricated by the multifunctional bonding material system have been investigated as a function of the linewidth of a current blocking layer (CBL). As the CBL width increases from 0 to , the forward voltage increases from 2.82 to 2.88 V at 350 mA, whereas the reverse leakage current decreases from to at −10 V. The output power increases with increasing CBL linewidth. Furthermore, the output power of all the samples continuously increases without saturation across the current range of 0–1000 mA.