TY - JOUR
T1 - Thermally Activated Delayed Fluorescent Donor-Acceptor-Donor-Acceptor π-Conjugated Macrocycle for Organic Light-Emitting Diodes
AU - Izumi, Saika
AU - Higginbotham, Heather F.
AU - Nyga, Aleksandra
AU - Stachelek, Patrycja
AU - Tohnai, Norimitsu
AU - de Silva, Piotr
AU - Data, Przemyslaw
AU - Takeda, Youhei
AU - Minakata, Satoshi
PY - 2020
Y1 - 2020
N2 - A new class of thermally activated delayed fluorescent donor-acceptor-donor-acceptor (D-A-D-A) π-conjugated macrocycle comprised of two U-shaped electron-acceptors (dibenzo[a,j]phenazine) and two electron-donors (N,N'-diphenyl-p-phenyelendiamine) has been rationally designed and successfully synthesized. The macrocyclic compound displayed polymorphs-dependent conformations and emission properties. Comparative studies on physicochemical properties of the macrocycle with a linear surrogate has revealed significant effects of the structural cyclization of D-A-repeating structure, including more efficient thermally activated delayed fluorescence (TADF). Furthermore, an organic light-emitting diode (OLED) device fabricated with the macrocycle compound as the emitter has achieved a high external quantum efficiency (EQE) up to 11.6%, far exceeding the theoretical maximum (5%) of conventional fluorescent emitters and that with linear analog (6.9%).
AB - A new class of thermally activated delayed fluorescent donor-acceptor-donor-acceptor (D-A-D-A) π-conjugated macrocycle comprised of two U-shaped electron-acceptors (dibenzo[a,j]phenazine) and two electron-donors (N,N'-diphenyl-p-phenyelendiamine) has been rationally designed and successfully synthesized. The macrocyclic compound displayed polymorphs-dependent conformations and emission properties. Comparative studies on physicochemical properties of the macrocycle with a linear surrogate has revealed significant effects of the structural cyclization of D-A-repeating structure, including more efficient thermally activated delayed fluorescence (TADF). Furthermore, an organic light-emitting diode (OLED) device fabricated with the macrocycle compound as the emitter has achieved a high external quantum efficiency (EQE) up to 11.6%, far exceeding the theoretical maximum (5%) of conventional fluorescent emitters and that with linear analog (6.9%).
U2 - 10.1021/jacs.9b11578
DO - 10.1021/jacs.9b11578
M3 - Journal article
C2 - 31895980
SN - 0002-7863
VL - 142
SP - 1482
EP - 1491
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 3
ER -