Comparison between standing transparent mirrorless packaging and planar-mounted packaging for GaN-on-GaN LEDs

Abstract

Abstract This work demonstrates that standing transparent mirrorless LED packaging as an attractive alternative configuration to increase the light extraction of LED on GaN substrate rather than standard planar-mounted packaging. From comparison study, it was found that the external quantum efficiency and the wall-plug efficiency of the standing transparent mirrorless LED is improved by 7% with respect to the planar-packed LED at a standard operating current of 20 A/cm2. The extraction of light of the LED with the standing transparent mirrorless packaging is contributed from all sides of the LED. In contrast, the light extraction for the LED with the planar-mounted packaging is only coming from the top and the sidewalls of the LED as well as having a longer path length for the photon to escape from LED and might increasing the possibility of light absorption in the GaN substrate.