Fig. 2: Observation of coupling in host–guest RTP system.
From: Building bridges through dynamic coupling for organic phosphorescence
a Prompt and delayed photoluminescence (PL) spectra of PY−CzA under ambient conditions excited at 365 nm. The prompt PL spectra of CzA crystals and PY−PMMA film, as well as the delayed PL spectra of PY−PMMA film at 77 K were included for comparison. Delay time: 10 ms. Chemical structures of CzA and PY were illustrated. The inset showed the photographs of PY−CzA crystals taken under 365 nm UV on and off modes. b Time-resolved PL spectra of PY−CzA at varying delay time. c Energy level alignment of frontier molecular orbitals of CzA and PY. d Natural transition orbitals (NTOs) contributing to the transitions for singlet and triplet states of the complex (SC and TC). The energy difference between SC and TC (ΔEST) was noted. Color code: green, hole; blue, particle. e Lifetime curves of PY−CzA crystals at 298 K and PY−PMMA film at 77 K excited at 365 nm with emission recorded at 595 nm.
