High<i>T</i><sub>g</sub>Fluorene-based Hole-transporting Materials for Organic Light-emitting Diodes
作者:Ke-Feng Shao、Ying-Feng Li、Lian-Ming Yang、Xin-Jun Xu、Gui Yu、Yun-Qi Liu
DOI:10.1246/cl.2005.1604
日期:2005.12
A new series of fluorene-based hole-transporting materials, 9,9-bis[4-(di-p-tolylamino)phenyl]-2,7-bis(diphenylamino)fluorene (1), 9,9-bis[4-(di-p-tolylamino)phenyl]-2,7-bis(di-p-tolylamino)fluorene (2), 9,9-bis[4-(di-p-tolylamino)phenyl]-2,7-bis(2-naphthylphenylamino)fluorene (3), and 9,9-bis[4-(di-p-tolylamino)phenyl]-2,7-bis(9-carbazolyl)fluorene (4), was prepared and employed in the fabrication of organic light-emitting devices (OLEDs). These materials were designed to have bulky triarylamine moieties at the C-9 position, which provides them with excellent thermal stability and high glass-transition temperatures (Tg = 139–171 °C). 1 and 3 are comparable to 1,4-bis(1-naphthylphenylamino)biphenyl (NPB) in terms of device performance (maximum luminence and current efficiency) in a standard hole-transporting layer (HTL)/tris(8-hydroxyquinolino)aluminum (Alq3) double-layer device, but are superior to NPB in terms of higher glass-transition temperatures (Tg = 139 and 145 °C, respectively), while 2 shows higher luminance and current efficiency as well as Tg (140 °C) than those of NPB (100 °C).
一系列基于芴的孔传输材料被制备并用于有机发光器件(OLED)的制造,具体包括:9,9-bis[4-(二对甲基氨基)苯基]-2,7-bis(二苯氨基)芴(1),9,9-bis[4-(二对甲基氨基)苯基]-2,7-bis(二对甲基氨基)芴(2),9,9-bis[4-(二对甲基氨基)苯基]-2,7-bis(2-萘基苯氨基)芴(3),以及9,9-bis[4-(二对甲基氨基)苯基]-2,7-bis(9-咔唑基)芴(4)。这些材料的设计在C-9位置有大体积的三芳胺结构,使其具备优异的热稳定性和较高的玻璃转变温度(Tg = 139–171 °C)。在标准的孔传输层(HTL)/三(8-羟基喹啉)铝(Alq3)双层器件中,材料1和3在器件性能(最大亮度和电流效率)方面与1,4-bis(1-萘基苯氨基)联苯(NPB)相当,但在玻璃转变温度方面(Tg = 139和145 °C,分别)优于NPB,而材料2展现出比NPB(100 °C)更高的亮度、电流效率和玻璃转变温度(140 °C)。