Characterization and Improvement of Polymer Solution Light-Emitting Devices
Final rept. 1 Jan 2000-30 Nov 2002
CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
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Our original objective was the understanding of polymer solution light-emitting devices SLED, from device mechanism to materials. After a two-year intense research on SLEDs, we have expanded our project to other areas, from SLEDs, to phosphorescent PLEDs, and high performance photovoltaic devices. It is realized that our SLED has a similar mechanism as the ECL process. The electrogenerated chemiluminescence ECL process usually involves at least two species or two reactions. One reaction is the oxidation process in which a species is oxidized near the anode to form a radical cation and the other species is reduced near the cathode to form a radical anion. The radical species with lower molecular weight will move to the counter-electrode. When the radical anions and radical cations encounter within the charge hopping distance, charge transfer will occur. The electron transition is from the high-energy excited state Eex to the low-energy state. In the case of poly 9,9-BIS3,6-DIOXAHEPTYL-FLUORENE-2,7-DIYL BDOH-PF and 1,2-dichlorobenzene DCB, EexBDOH-PF EexDCB and the radical cation of DCB will transfer its positive charge to the radical anions of BDOH-PF actually an electron hops from the radical anion to the DCB radical cation to form the excited state of BDOH-PF and blue light emission will take place when the excited state decays to its ground state.
- Polymer Chemistry
- Electrical and Electronic Equipment