Molecular Modification of 2,7-Diphenyl[1]benzothieno[3,2-b]benzothiophene (DPh-BTBT) with Diarylamino Substituents: From Crystalline Order to Amorphous State in Evaporated Thin Films

Izawa T; Mori H; Shinmura Y; Iwatani M; Miyazaki E; Takimiya K; Hung HW; Yahiro M; Adachi C

Chemistry Letters, Vol.38, No.5, 420-421, 2009

DOI10.1246/cl.2009.420 Export Citation

Molecular Modification of 2,7-Diphenyl[1]benzothieno[3,2-b]benzothiophene (DPh-BTBT) with Diarylamino Substituents: From Crystalline Order to Amorphous State in Evaporated Thin Films

Izawa T, Mori H, Shinmura Y, Iwatani M, Miyazaki E, Takimiya K, Hung HW, Yahiro M, Adachi C

Introduction of diarylamino substituents on 2,7-diphenyl[1]-benzothieno[3,2-b]benzothiophene (DPh-BTBT) caused morphological change in the evaporated thin-film state: from highly crystalline films with edge-on molecular orientation for DPh-BTBT to amorphous films for the diarylamino derivatives. The former was unsuitable as a hole-transporting layer in organic light-emitting diodes (OLEDs), whereas the latter acted as a superior hole-transporting layer in multilayered OLEDs.