This PDF file includes:

• Synthesis and characterization of 2CzBN, o-3CzBN, and p-3CzBN
  
• fig. S1. Time profiles of TAS of various triplet states of 4CzIPN and 2CzPN in toluene.
  
• fig. S2. Steady-state absorption spectra.
  
• fig. S3. Laser power dependence in TAS spectra.
  
• fig. S4. TAS spectra of the CzBN derivatives.
  
• fig. S5. TAS results of 3, 4, 6-p-3CzBN.
  
• fig. S6. Energy position of CR band.
  
• fig. S7. Emission spectra of CzPN derivatives.
  
• fig. S8. Time profiles of TAS of triplet states of CzBN derivatives.

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