Spin & Excitonic Engineering Group
Prof. Marc Baldo


Light Emitting Devices

Organic light emitting devices (OLEDs) are a highly promising emissive technology for flat panel displays. OLEDs employ soft organic semiconductors to convert injected charge into luminescent excitons, in a process known as electroluminescence. But in order to be widely adopted, OLEDs must not only match the color purity and long-term stability of competing technologies, they must realize their maximum potential efficiency.

We have focused on the efficiency of electroluminescence, and particularly the effects of spin on exciton formation in organic semiconductors. We have measured the fundamental efficiency limits in OLEDs and demonstrated a new method for improving performance that we term ‘extrafluorescence’.

We have demonstrated a new method for obtaining high efficiency blue OLEDs and developed a novel technique for analyzing the optical properties of OLEDs.

We have also developed a novel method for patterning thin films of organic semiconductors.

See our work on:


Figure: An active matrix OLED display prototype built by Samsung.