OPTICAL-ABSORPTION, LUMINESCENCE, AND UV-EXCITED OPTICALLY DETECTED MAGNETIC-RESONANCE (UV-ODMR) STUDY OF POLY(P-PHENYLENEETHYNYLENEANILINE) (PPEA) DERIVATIVES

The absorption, photoluminesence (PL), and X-band (9.35 GHz) ODMR spec tra of several PPEA derivative films is described and discussed. The a bsorption of the solutions and films peak at 390 - 415 and 415 - 422 n m, resp. The intense PL of the solutions and films peak at 425 - 450 a nd 450 - 490 nm, resp. Interestingly, the vibronic structure of the PL of the solutions is clearer than that of the films. The ODMR excited at 254 less than or equal to lambda(ex) less than or equal to 400 nm i ncludes the following familiar features: (i) a narrow polaron resonanc e at g approximate to 2.002 and (ii) full- and half-field triplet exci ton powder patterns. However, the widths of the polaron and full-field triplet powder pattern resonances are similar to 30 and similar to 15 00 G, resp., as compared to 10 - 15 and 600 - 900 G, resp., of other p i-conjugated polymers. The results are discussed in relation to struct ural disorder and defects in these polymers.