Acta Phys. -Chim. Sin. ›› 2017, Vol. 33 ›› Issue (4): 816-822.doi: 10.3866/PKU.WHXB201612223

• ARTICLE • Previous Articles     Next Articles

One-Step Synthesized Novel Spiro[fluorene-9, 9'-xanthene]-Based Materials as Highly Efficient Blue Phosphorescent Hosts in Organic Light-Emitting Devices

Yu-Qiao GUAN1,Gang CHEN2,Juan SONG1,Cheng-Xin WANG1,Yan QIAN1,Qin ZHANG1,Ling-Ling DENG2,Zeng-Qin FENG1,Wen-Juan SHANG1,3,You-Tian TAO4,Shu-Fen CHEN1,*(),Lian-Hui WANG1,Wei HUANG1,4,*()   

  1. 1 Key Laboratory for Organic Electronics and Information Displays and Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing University of Posts and Telecommunications, Nanjing 210023, P. R. China
    2 School of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, P. R. China
    3 State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, P. R. China
    4 Key Laboratory of Flexible Electronics and National Synergistic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, P. R. China
  • Received:2016-10-31 Published:2017-03-23
  • Contact: Shu-Fen CHEN,Wei HUANG E-mail:iamsfchen@njupt.edu.cn;wei-huang@njtech.edu.cn
  • Supported by:
    the National Key Basic Research Program of China (973)(2015CB932202);the National Key Basic Research Program of China (973)(2012CB933301);National Natural Science Foundation of China(61274065);National Natural Science Foundation of China(51173081);National Natural Science Foundation of China(61136003);National Natural Science Foundation of China(BZ2010043);National Natural Science Foundation of China(21373114);National Natural Science Foundation of China(21573111);National Natural Science Foundation of China(21003076);National Natural Science Foundation of China(6150508);National Natural Science Foundation of China(21304047);Science Fund for Distinguished Young Scholars of Jiangsu Province, China(BK20160039);Ministry of Education of China(IRT1148);Natural Science Foundation of Jiangsu Province, China(BM2012010);Natural Science Foundation of Jiangsu Province, China(BK20141424);Priority Academic Program Development of Jiangsu Provincial Higher Education Institutions, China(YX030001);Ordinary University Graduate Student Practical Innovation Projects of Jiangsu Province, China(SJLX15_0390);Pandeng Project of Nanjing University of Posts and Telecommunications, China(NY214085);Open Foundation from Jilin University, China(IOSKL2015KF32)

Abstract:

We synthesized a series of novel spiro[fluorene-9, 9'-xanthene] (SFX)-based host materials via a one-step palladium-catalyzed cross-coupling reaction. These materials have high triple energy levels and high yield, and thus can be used as hosts for blue phosphors. Blue phosphorescent organic light-emitting devices (PHOLEDs) with a bis (3, 5-difluoro-2-(2-pyridyl) phenyl-(2-carboxypyri-dyl) iridium (Ⅲ) (FIrpic) emission were fabricated. Furthermore, we applied cohosts composed of one of the new synthesized materials and the hole transport material di-[4-(N, N-ditolyl-amino)-phenyl]cyclohexane (TAPC) to the blue PHOLEDs to successfully acquire efficient blue emissions. The SFX-based material provided efficient energy transfer while TAPC improved the mobility of the cohost as well as reduced the working voltage. Maximum current efficiencies of 22.56 and 25.93 cd·A-1 and the maximum brightnesses of 6421 and 6196 cd·m-2 were obtained for the PHOLEDs with TAPC: 2-(9-phenyl-fluoren-9-yl) spiro[fluorene-9, 9'-xanthene] (PF-SFX) and TAPC: 2-(9-(4-(octyloxy)-phenyl)-9H-fluoren-9-yl) spiro[fluorene-9, 9'-xanthene] (C8OPF-SFX) cohosts, respectively. The experimental results obtained for the four SFX-based host materials were enough to declare that SFX is an effective main unit that can be used to build efficient host materials for blue phosphors containing only C, H, and O basic elements.

Key words: Palladium catalyzed reaction, One-step method, Cohost, High performance, Blue organic light-emitting device

MSC2000: 

  • O649