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. 2017 Apr 13;8:14987. doi: 10.1038/ncomms14987

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Copyright © 2017, The Author(s)

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(a) The phosphorescence spectra are measured at 80 K in a zeonex matrix at 0.5 ms delay time. (b) The peak that is located below 2.4 eV in both spectra is attributed to the T₁–T_N absorption of phenothiazine. The broad absorption up to 1.4 eV found in 3,7-DPTZ-DBTO₂ is attributed to the CT states emphasizing the energy diagram shown in Fig. 1c. The normalized differential is shown to emphasize the CT state PIA and the shift in the ³LE PIA.