Figure 6: Transient thermal and optical characteristics of different GaN LEDs.

(a) Experimental transient cooling curves of the LED packages at an injection current of 150 mA. (b) Variations in junction temperature as a function of injection current. (c) Differential structure functions (K) of conventional, SiO2- and rGO-embedded LED packages under 150 mA current injections. (d) Light-output power of the LED chips as a function of injection current.