The attractiveness of OLEDs is that they are made from dyes and organic polymers that can, in principle at least, simply be printed onto a substrate. Potentially at least this allows the inexpensive manufacture of very large screen display or detector units. The devices can also be very sturdy since they contain no fragile crystalline material, and don't necessarily need glass covers.
Current devices are switched using thin film transistors and achieve about 1% efficiency in converting electricity to light. Lifetimes of 4 years have been achieved.
Problems with the technology include the current need for active matrix drivers, difficulty in maintaining constant luminescence over large areas, and difficulty in developing efficient low voltage blue emitting polymers.
Return To Index Copyright 1994-2002 by Donald Kenney.