TY - JOUR
T1 - The regioisomeric effect on the excited-state fate leading to room-temperature phosphorescence or thermally activated delayed fluorescence in a dibenzophenazine-cored donor–acceptor–donor system
AU - Hosono, Takumi
AU - Decarli, Nicolas Oliveira
AU - Crocomo, Paola Zimmermann
AU - Goya, Tsuyoshi
AU - de Sousa, Leonardo Evaristo
AU - Tohnai, Norimitsu
AU - Minakata, Satoshi
AU - de Silva, Piotr
AU - Data, Przemyslaw
AU - Takeda, Youhei
PY - 2022
Y1 - 2022
N2 - Exploring the design principle for switching between thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP) is a fundamentally important research to develop triplet-mediated photofunctional organic materials. Herein systematic studies on the regioisomeric and substituent effects in a twisted donor–acceptor–donor (D–A–D) molecular scaffold (A = dibenzo[a,j]phenazine; D = dihydrophenazasiline) on the fate of its excited state have been performed. The study revealed that regioisomerism clearly affects the emission behavior of the D–A–D compounds. Moreover, distinct differences in TADF, dual TADF & RTP, and dual RTP were observed, depending on the host used. Furthermore, organic light-emitting diodes (OLEDs) fabricated with the developed emitters achieved high external quantum efficiencies (EQEs) of up to 7.4% for RTP-based OLEDs.
AB - Exploring the design principle for switching between thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP) is a fundamentally important research to develop triplet-mediated photofunctional organic materials. Herein systematic studies on the regioisomeric and substituent effects in a twisted donor–acceptor–donor (D–A–D) molecular scaffold (A = dibenzo[a,j]phenazine; D = dihydrophenazasiline) on the fate of its excited state have been performed. The study revealed that regioisomerism clearly affects the emission behavior of the D–A–D compounds. Moreover, distinct differences in TADF, dual TADF & RTP, and dual RTP were observed, depending on the host used. Furthermore, organic light-emitting diodes (OLEDs) fabricated with the developed emitters achieved high external quantum efficiencies (EQEs) of up to 7.4% for RTP-based OLEDs.
U2 - 10.1039/D1TC05730H
DO - 10.1039/D1TC05730H
M3 - Journal article
SN - 2050-7526
VL - 10
SP - 4905
EP - 4913
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
IS - 12
ER -