Many have focussed on improving further the molecular design of this emitter and have investigated derivatives. Kaji and co-workers reported two modified structures of DMAC-TRZ incorporating adamantane at different positions in MA-TA, and a-DMAC-TRZ (Figure ). In the first report, the substitution of the two distal phenyl rings on the triazine acceptor with adamantly groups reduced the conjugation length of the acceptor, weakening it and leading to a bluer emission. Toluene solutions and neat films of MA-TA emit at 469 and 453 nm, respectively, compared to 494 and 500 nm for DMAC-TRZ. The 10 wt% doped film of MA-TA in CzSi shows a near unity FPL of 99%, thus efficient solution-processed blue devices showed an EQEmax of 22.1%, at lEL of 475 nm. The functionalization of the donor in a-DMAC-TRZ increased the rigidity of the structure ultimately leading to a more efficient device than with DMAC-TRZ, showing an EQEmax of 28.9% and a lEL of 488 nm.