Fig. 2: Photoluminescence and LPL characteristics of the OLPL systems. | Nature Communications

Fig. 2: Photoluminescence and LPL characteristics of the OLPL systems.

From: Influence of energy gap between charge-transfer and locally excited states on organic long persistence luminescence

Fig. 2

a Chemical structures and HOMO or LUMO energy levels of the three electron donors (TMB, DMDTB, and TTB) and the electron acceptor (PPT). b, c Semi-logarithmic plots (b) and logarithmic plots (c) of the emission decay profiles of TMB/PPT, DMTDB/PPT, and TTB/PPT at 300 K. Emission decay profiles contain all of the emission over wavelengths from 400 to 900 nm. Samples were excited for 60 s (from −60 to 0 s) by a 340 nm LED source. PL means the steady-state photoluminescence, LPL means the long-persistent luminescence, and Phos. means the phosphorescence. d–f The steady-state photoluminescence and time-resolved photoluminescence spectra of 1 mol% TMB/PPT (d), DMDTB/PPT (e), and TTB/PPT (f) films at 300 K. The time-resolved spectra were integrated over periods of 1–2, 4–5, 10–30, and 100–300 s after stopping excitation. The dashed lines indicate the onset of the LPL spectra.

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