Wide-Energy-Gap Host Materials for Blue Phosphorescent Organic Light-Emitting Diodes
Wide-Energy-Gap Host Materials for Blue Phosphorescent Organic Light-Emitting Diodes
复制标题
用于蓝色磷光有机发光二极管的宽能隙主体材料
DOI：
10.1021/cm8032302
复制
发表时间：
2009-03
影响因子：
8.6
通讯作者：
Lu, Kun
中科院分区：
文献类型：
--
作者：
Wen, Yugen;Di, Chong-an;Liu, Yunqi;Wu, Weiping;Liu, Ying;Yu, Gui;Du, Chunyan;Xi, Hongxia;Ye, Shanghui;Lu, Kun
设计并合成了两种新型宽禁带蓝色磷光基质分子1，3-双（9-苯基-9H-芴-9-基）苯（mDPFB）和1，4-双（9-苯基-9H-芴-9-基）苯（pDPFB）。对材料的热学、物理、电化学性质以及电致发光特性进行了研究。mDPFB和pDPFB都具有高的单重态（4.0 eV）和三重态（2.8 eV）能量，与深蓝色磷光掺杂剂双（4′，6 ′-二氟苯基吡啶）四（1-吡唑基）硼酸铱（III）（FIr 6）具有很好的能量匹配。生长了新合成的化合物mDPFB和pDPFB的单晶，并用X射线衍射法测定了它们的晶体结构。这两种分子都采用刚性扭曲四面体晶体学构象，并且在固态中不存在面对面的π−π堆积。苯1，4位上的取代基提高了芴环的扭曲程度，对芴的热稳定性和热稳定性有显著影响。
Two novel wide-energy-gap molecules, 1,3-bis(9-phenyl-9H-fluoren-9-yl)benzene (mDPFB) and 1,4-bis(9-phenyl-9H-fluoren-9-yl)benzene (pDPFB), suitable for blue phosphorescent host materials, were designed and prepared. The thermal, photophysical, and electrochemical properties as well as electroluminescence characteristics were fully investigated. Both mDPFB and pDPFB possess high singlet (4.0 eV) and triplet (2.8 eV) energies, well energy-matched with the deep-blue phosphorescent dopant, iridium(III) bis(4′,6′-difluorophenylpyridinato)tetrakis(1-pyrazolyl)borate (FIr6). The single crystals of the newly synthesized compounds mDPFB and pDPFB were grown, and their crystal structures were determined by X-ray diffraction. Both molecules adopt a rigid twisted tetrahedral crystallographic conformation, and no facial to facial π−π stacking exists in the solid state. The substituents at the 1,4-positions of benzene enhance the twisted degree of the fluorenyl rings and have predominant influence on the thermal and m...