High Performance Organic Materials and Devices
Final rept. 2003-2006
CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
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During our three-year period of time, significant progresses have been achieved in PLEDs, PV cells and memory devices. First, vertical OFET with astonishing device performance was demonstrated low operating voltage 5 V, high current output 10 mA, or 4Acm2, and high ONOFF ratio 4 x 10. These new devices were operated by modulating charge injection, rather than charge transport. This invention opened a new direction in basic scientific research for organic transistors and their applications. For the first time, an organic transistor which has sufficient power to drive an organic LED was demonstrated. Second, highly efficient polymer solar cells based on a bulk heterojunction of polymer poly3-hexylthiophene and methanofullerene was shown. An efficiency of up to 4.4 , one of the highest numbers published so far, was achieved by controlling the growth rate of the active layer. The high efficiency achieved in this work brings this device one step closer to commercialization. Third, 7,8,l0-triphenylfluoranthene, a highly luminescent solid-state blue-emitting small molecule, was synthesized. OLEDs based on this material exhibited external ouantum efficiency of 2.48 and electroluminescence efficiency as high as 3.33 cdA.
- Computer Hardware
- Test Facilities, Equipment and Methods
- Electricity and Magnetism