Charge Carrier Diffusion in Blue LEDs
Blue light emitting diodes (LEDs) remain subject to widespread research because they exhibit detrimental behavior that LEDs of other colors do not. While most LEDs become more efficient at converting electrical power to light as the drive current increases, blue LEDs only increase in efficiency up to a certain current threshold, at which point they become progressively less efficient. The decrease in efficiency is called droop. Previous research in the Gfroerer lab has shown that when a laser excites a blue LED device, the device emits light from regions that are not directly excited. We investigate this phenomenon by comparing operational conditions under optical and electrical excitation, and constructing a computational model of electron-hole diffusion in the device.