Abstract Electron spin echo (ESE) measurements for T1 and Tm were obtained from 4–300 K for potassium and lithium-doped poly(p-phenylene), (PPP), and potassiumdoped p-sexiphenyl (6o) and p-terphenyl (3o). At 300 K, T1=Tm for K-PPP; T1=2Tm for K-6o and T1=10Tm for K-3o at the highest possible concentration of donor dopant. T1 and Tm are temperature independent between 4 and 50 K and vary by a factor of less than four between 4 and 300 K. The temperature independence of T1 and Tm, and T1=Tm is attributed to exchange narrowing beotween anions located on neighboring chains with r<10 A and not to charge carriers of conductivity.