Secret Unveiled
A Korea research team has found the core reason for the efficiency of quantum dot light-emitting devices, which are regarded as the next generation of displays. The research findings are expected to be widely used in next-gen high color purity displays and high brightness lighting.
A joint research team headed by Dr. Bae Wan-ki at the Korea Institute of Science and Technology, Lee Do-chang, professor at the Korea Advanced Institute of Science and Technology, and Lee Chang-hee, professor at Seoul National University, announced on Dec. 22 that they discovered the phenomenon that delivers energy between quantum dots. This energy delivery occurs during the light emission of the light-emitting devices, and actually lowers the efficiency of those devices.
In addition, the research team successfully developed a quantum dot light-emitting material that minimizes the occurrence of this phenomenon. The team also succeeded in the development of high brightness, high performance, and high color purity quantum dot light-emitting devices by using the material.
Quantum dot light-emitting devices are used to supply electricity, and they are made by coating quantum dots as a film inside a device in order to make displays or lighting. Quantum dots are 1 to 20 nanometer-sized round semiconductor particles. There are high expectations for quantum dots, since wavelengths of light can be easily controlled in accordance with the size or shape. Moreover, they have high optical efficiency and excellent color purity.
The research findings were published online in the Dec. 17 issue of Advanced Materials, a weekly scientific journal published by Wiley-VCH.