Optical, ESR, and UV-excited optically detected magnetic resonance (UV ODMR) of poly(P-Diphenylene-Aniline-Acetylene) (PDPAA) derivatives.

Summary form only given. The absorption, photoluminesence (PL), and X-band (9.35 GHz) ESR and ODMR spectra of PDPAA derivative films is described and discussed. The absorption spectra of solutions of the polymers peak at 390 - 415 nm, and of the films at 415 - 422 nm. The intense emission of the solutions peaks at 420 - 450 nm, and of the films at 450 - 490 nm. The ODMR excited at 254 /spl les/ /spl lambda//sub ex/ /spl les/ 400 nm includes the following familiar features: (i) a narrow resonance at g /spl sp/ 2.002 attributed to the effects of polaron recombination on the radiative singlet exciton decay; (ii) full- and half-field triplet powder patterns, attributed to such effects of triplet excitons. However, the narrow resonance and full-field triplet powder pattern, which is /spl ap/1500 G wide, suggest that this polymer is highly disordered, with a broad distribution of polaron and triplet exciton trapping sites. The results will also be discussed in relation to the nature of the polaron and triplet exciton states and the absorption edge in conjugated polymers.