592
S. Yagi
Fig. 16.28 Structures of CAT-1, DBT-BZ-DMAC, DCB-BP-PXZ, CBP-BP-PXZ, mCP-BP-PXZ,
and mCBP-BP-PXZ
was ITO (anode)/TAPC (25 nm)/AIE-TADF emitter (35 nm)/1,3,5-tri(m-pyrid-3yl-phenyl)benzene (TmPyPB, 55 nm)/LiF (1 nm)/Al (cathode). The devices exhibited yellow EL with the CIE coordinate of (0.38–0.39, 0.57), and showed excellent
device performances: the maximum luminance, the maximum current efficiency, the
maximum power efficiency, and the maximum η ext were 95,577–100,126 cd m
–2 ,
69.0–72.9 cd A
–1 , 75.0–81.8 lm W
–1 , and 21.4–22.6%, respectively. Especially, the
maximum η ext is almost corresponding to the theoretical limit.
16.4.3 TADF Emitters Designed Through the Multiple
Resonance Effect
As described above, TADF emitters based on donor–acceptor type fluorophores have
so far been eagerly developed to overcome the theoretical limit for η ext of traditional
fluorescent emitters. In the case of such fluorophores, significant structural relaxation
often occurs when they are excited, which gives rise to broadened spectral band
S. Yagi
Fig. 16.28 Structures of CAT-1, DBT-BZ-DMAC, DCB-BP-PXZ, CBP-BP-PXZ, mCP-BP-PXZ,
and mCBP-BP-PXZ
was ITO (anode)/TAPC (25 nm)/AIE-TADF emitter (35 nm)/1,3,5-tri(m-pyrid-3yl-phenyl)benzene (TmPyPB, 55 nm)/LiF (1 nm)/Al (cathode). The devices exhibited yellow EL with the CIE coordinate of (0.38–0.39, 0.57), and showed excellent
device performances: the maximum luminance, the maximum current efficiency, the
maximum power efficiency, and the maximum η ext were 95,577–100,126 cd m
–2 ,
69.0–72.9 cd A
–1 , 75.0–81.8 lm W
–1 , and 21.4–22.6%, respectively. Especially, the
maximum η ext is almost corresponding to the theoretical limit.
16.4.3 TADF Emitters Designed Through the Multiple
Resonance Effect
As described above, TADF emitters based on donor–acceptor type fluorophores have
so far been eagerly developed to overcome the theoretical limit for η ext of traditional
fluorescent emitters. In the case of such fluorophores, significant structural relaxation
often occurs when they are excited, which gives rise to broadened spectral band