Efficient organic light emitting diodes and photodetectors

Summary form only given. A discussion of several approaches of employing organic semiconductors to achieve high performance devices is be the focus of this presentation. For example, we discuss means for obtaining extremely high efficiency organic light emitting devices (OLED) for displays, and organic photodetectors for power conversion and other detection applications, by effectively confining and capturing molecular excited states by appropriate and precision insertion of energy barriers in these devices. The first device to be discussed is an electrophosphorescent OLED. We show that by employing metallorganic phosphor molecules based on Pt or Ir, nearly 100% internal electroluminescent efficiency can be achieved. Using this approach, we have succeeded in demonstrating very high efficiency electrophosphorescent OLED emission in the red, green and blue spectral regions. Our most efficient devices demonstrated thus far are based on the green phosphor, (ppy)₂Ir(acac), with a maximum external quantum efficiency of 19±1%, and luminous power efficiency of 60±51 m/W