Transient phenomena of polyphenyls (PP), such as biphenyl (BP), p-terphenyl (TP), and 1,3,5-triphenylbenzene (TPB) in the higher triplet excited states (T-n, n greater than or equal to 2), were investigated with the nanosecond-nanosecond (ns-ns) two-color two-laser excitation method. PP(T-n) was generated by the excitation of PP in the lowest triplet excited state (PP(T-1)) at the wavelength tuned to the absorption of PP(T-1). Bleaching of the transient absorption of BP(T-1) and TP(T-1) was observed during the second laser irradiation in the presence of chloroalkanes (RCl) such as carbon tetrachloride (CCl4), dichloromethane (CH2Cl2), or 1,2-dichloroethane (DCE). In the case of TPB, clear bleaching of TPB(T-1) was observed in the presence of CCl4, while no bleaching was observed in the presence of CH2Cl2 and DCE. No formation of PP.+ was detected during the quenching of PP(T-n) by RCl. Therefore, the bleaching of PP(T-1) is attributed to triplet energy transfer quenching of PP(T-n) by RCl followed by the C-Cl bond cleavage. The lifetimes (tau(Tn)) of PP(T-n) were estimated from the dependence of the quenching efficiency on the RCl concentration. It was found that the tau(Tn) value decreased with the increasing number of benzene rings, BP(T-n) (950 ps) > TP(T-n) (620 ps) > TPB(T-n) (360 ps). The quenching mechanism of PP(T-n) by RCl was discussed.