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- Title
Isotope effect in spin response of π-conjugated polymer films and devices.
- Authors
Nguyen, Tho D.; Hukic-Markosian, Golda; Fujian Wang; Wojcik, Leonard; Xiao-Guang Li; Ehrenfreund, Eitan; Vardeny, Z. Valy
- Abstract
Recent advances in organic spin response include long polaron spin-coherence times measured by optically detected magnetic resonance (ODMR), substantive room-temperature magnetoelectroluminescence and magnetoconductance obtained in organic light-emitting diodes (OLEDs) and spin-polarized carrier injection from ferromagnetic electrodes in organic spin valves (OSVs). Although the hyperfine interaction (HFI) has been foreseen to have an important role in organic spin response, no clear experimental evidence has been reported so far. Using the chemical versatility advantage of the organics, we studied and compared spin responses in films, OLED and OSV devices based on π-conjugated polymers made of protonated, H-, and deuterated, D-hydrogen having a weaker HFI strength. We demonstrate that the HFI does indeed have a crucial role in all three spin responses. OLED films based on the D-polymers show substantially narrower magneto-electroluminescence and ODMR responses, and as a result of the longer spin diffusion obtained, OSV devices based on D-polymers show a substantially larger magnetoresistance.
- Subjects
CONJUGATED polymers; HYPERFINE interactions; ELECTRON paramagnetic resonance; LIGHT emitting diodes; POLARONS
- Publication
Nature Materials, 2010, Vol 9, Issue 4, p345
- ISSN
1476-1122
- Publication type
Article
- DOI
10.1038/nmat2633