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. 2017 May 10;3(5):e1603282. doi: 10.1126/sciadv.1603282

Fig. 1. EL mechanism.

Fig. 1

(A) Schematic of electrical exciton generation and EL mechanism in TADF-OLEDs. (B) Relationship between experimentally determined kRISC and ΔEST in previous works (5, 13–19) and this work. The kRISC values of (4) to (6), treating to ~0 s−1, are below the limit of the estimation because of nearly no or undetectably weak DF intensity (Fig. 2A, inset). (C) Molecular structures of CzPN and CzBN derivatives, highlighting linearly positioned Cz moieties (blue). The numbering of the substituent positions of the BN core is depicted for 2CzBN. (D) D and A units of the CzPN and CzBN derivatives and D-A-D structure constructed with a linearly positioned Cz pair. R indicates substituents with electron-accepting properties, such as cyano groups.