Fig. 3: Influence of ΔELE-CT on components of the emission spectra.
a, b Solvatochromic shift analysis (a) and PL spectra (b) of DACT-II doped in different hosts. c,d, Solvatochromic shift analysis of solutions (b) and doped films (c) of AAPC. Details are provided in Supplementary Figs. 25, 26 and Supplementary Tables 4–6. THF tetrahydrofuran, EA ethyl acetate, MTBE t-butyl methyl ether. e, f PL spectra of DAAPC (e) and DDATA (f) in different hosts. The red dashed line emphasizes the two emission peaks at the same wavelength position. All spectra transformed from the original spectra through Jacobian conversion64. g, h Emission decay profiles of DAAPC-doped materials from 100 ps to 10 ms (g) and from 1 ms to 104 s (h). The blue dashed arrows indicate the relative contribution of the corresponding luminescence components, which decrease progressively following the order of the listed host materials from top to bottom. Relative time-resolved spectra: see Supplementary Fig. 31a–f. Spectra and decay profiles of 0.1 ns–10 ms were measured by streak camera with an exaction of the 343 nm femtosecond laser (Pulse energy = 2 μJ, width = 165 fs, repetition rate = 25 Hz) except DAAPC/3,7-PPT (400 nm). Decay profiles of >10 ms were measured using a multipixel photon counter (MPPC). Excitation conditions: 340 nm, 400 µW, 1 min. i, j The Jablonski diagram of DDATA/2,8-PPT (i large ΔELE–CT) and DAAPC/2,8-PPT ( j small ΔELE–CT) systems. The 1LED, 1LEA and 1LEA,neat film energy is from Supplementary Figs. 13, 14, 37. The 1,3CT and 3LED energy is from Supplementary Fig. 38a, b. Because the CT state energies of DDATA/2,8-PPT and DAAPC/2,8-PPT are identical (Supplementary Fig. 38d), the 1,3CT energy values from DDATA/2,8-PPT were used in the schematic of DAAPC/2,8-PPT as well. ΔELE-CT values calculated from spectra data were slightly different from the results shown in Table 1. kLE1, kCT1 is calculated from Supplementary Fig. 36e, f. The doping concentration of all doped film samples in this figure is 1 mol%.
