Warm white LED with stacked wafers and fabrication method thereof

摘要

A warm-white-light LED structure combines a red light wafer and a blue light wafer via a bonding layer. A reflecting layer is arranged over upper and lower surfaces of the bonding layer respectively; the lower surface of the red light wafer takes up one-third or less of the upper surface of the blue light wafer, which effectively reduces packaging structure volume and time of bondings so as to optimize process flow and save fabrication cost.

主权项

1. A warm-white-light LED comprising:
a bonding layer having a first and a second main surfaces; a red light wafer mirror system over the first main surface of the bonding layer, including a red light wafer and a first reflecting layer; and a blue light wafer mirror system over the second main surface of the bonding layer, including a blue light wafer and a second reflecting layer; wherein the first reflecting layer and the second reflecting layer are configured to separate the red light wafer and the blue light wafer to avoid mutual absorption; and wherein the red light wafer has a lower surface area less than or equal to one third of an upper surface area of the blue light wafer.