Molecular Modification of 2,7-Diphenyl[1]benzothieno[3,2-<i>b</i>]benzothiophene (DPh-BTBT) with Diarylamino Substituents: From Crystalline Order to Amorphous State in Evaporated Thin Films
作者:Takafumi Izawa、Hiroki Mori、Yusuke Shinmura、Masahito Iwatani、Eigo Miyazaki、Kazuo Takimiya、Hsio-Wen Hung、Masayuki Yahiro、Chihaya Adachi
DOI:10.1246/cl.2009.420
日期:2009.5.5
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.
在 2,7-二苯基[1]苯并噻吩并[3,2-b]苯并噻吩(DPh-BTBT)上引入二芳基氨基取代基会导致蒸发薄膜状态的形态发生变化:DPh-BTBT 为具有边缘分子取向的高结晶薄膜,而二芳基氨基衍生物则为无定形薄膜。前者不适合作为有机发光二极管(OLED)中的空穴传输层,而后者则可作为多层有机发光二极管中的优质空穴传输层。