[14p-302-1~17] 12.4 Organic light-emitting devices and organic transistors

[14p-302-11] A novel molecular design strategy for thermally activated delayed fluorescence materials with planar fused-ring system

〇Masashi Mamada^1,2, Ko Inada^1,2, Takeshi Komino^1,2, Hajime Nakanotani^1,2, Chihaya Adachi^1,2,3 (1.OPERA, Kyushu Univ., 2.JST,ERATO, 3.WPI-I2CNER)

Keywords:thermally activated delayed fluorescence (TADF), Excited state intramolecular proton transfer (ESIPT), quinacridone

We addressed a novel molecular design for thermally activated delayed fluorescence material (TADF) for the efficient organic light-emitting diode (OLED) without standard donor-acceptor (D-A) system. Although the D-A system is well-established and of advantage with respect to availability of many π-conjugated aromatic rings, the molecular structure has a large steric hindrance to achieve effective HOMO-LUMO separation. Therefore, the large structural relaxation in the excited state might potentially cause the degradation of molecules. On the other hand, our molecular design provides the ability to develop a fully planar and rigid molecule.