The "culprit" of LED light efficiency decline

Recently, researchers at the Rensselaer Polytechnic Institute discovered the culprit of the "electron leakage" phenomenon, which is the reason why the light efficiency of LED light sources has dropped by as much as 20%.

The researchers found this reason in a recent paper published in Applied Physics Letters. E. Fred Schubert, a senior professor of the study, said: “In the past, researchers and LED manufacturers have made some progress in reducing efficiency, but these advances have not been obtained after understanding the reasons. ”

LED light efficiency decline Rensselaer College finds "culprit"

Research team found the reason for the decrease in LED efficacy

Schubert said that their research shows that the characteristics of electrons and holes are different and they are more fluid. Therefore, diodes can be regarded as being composed of different types of carriers.

"If electrons and holes have similar properties, then both sides will generate symmetrical electric fields and the quantum wells will reorganize there," Schubert said. "We use electronically more active materials to replace it and we can find electrons. It's easier to move, it's easier to diffuse, and it's easier to generate an asymmetrical electric field, which also makes electrons and holes inactive, so they don't emit light, which leads to a reduction in the light efficiency of the LED."

Meyaard and Schubert said that the research team has now turned its attention to the structural model of the development of LED, they also look forward to the application of new technologies to completely solve this problem.