Fig. 1. The structure diagram of six samples

Fig. 2. The diagram of transient absorption optical system

Fig. 3. The TA spectra at different delay time of the first series of samples

Fig. 4. The TA spectra and corresponding A spectra at different delay time of the second series of samples

Fig. 5. Normalized delay time traces and corresponding fitting curves

Fig. 6. The summary of different decay mechanism occurring in PTAA/DA/PVK:DA over a large time range