Another design strategy, developed by Sun et al., for TADF dendrimers incorporates nonconjugated aliphatic chains linked to distal carbazole moieties that act as host units. Compounds TZ-Cz and TZ-3Cz (Figure ) are based on a para-connected C3 symmetric carbazoletriazine reference compound, Tz. The authors contend that the emissive core is encapsulated by the non-conjugated dendrons, thus suppressing concentration quenching. Similar to TR1 and TR2, Tz (λPL: 502 nm; FPL: 25%; ΔEST: 0.28 eV; in neat film) is only a fluorescent emitter and does not show TADF. However, TADF turns on in TZ-Cz (λPL: 490 nm; FPL: 58% in neat film; ΔEST: 0.20 eV) and TZ-3Cz (λPL: 487 nm; FPL:76% in neat film; ΔEST: 0.20 eV), which the authors assert is due to the change in local environment that results from the encapsulation. The best solution-processed OLED was achieved using TZ-3Cz (λEL: 520 nm; CIE = (0.24, 0.51))