Spirofluorene-Based Blue Phosphorescent Organic Light-Emitting Diode with Improved Efficiency Using Co-Host Structure

doi:10.21127/yaoyigc20150003

General Chemistry ›› 2015, Vol. 1 ›› Issue (1): 3-7.DOI: 10.21127/yaoyigc20150003

Special Issue: Organic Optoelectronics & Photonics

Spirofluorene-Based Blue Phosphorescent Organic Light-Emitting Diode with Improved Efficiency Using Co-Host Structure

Mingli Sun,*^,a Yuqiao Guan,^b Bin Liu,*^,b Shufen Chen,^a Yang Zhang,^a Hongtao Cao,^b Linghai Xie,^b Yan Qian,^b Wei Huang*^{^,b}

^aDepartment of Chemistry, College of Science, Northeast Forestry University, Harbin, Heilongjiang 150040, China
^bCenter for Molecular Systems and Organic Devices (CMSOD), Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, Nanjing, Jiangsu 210023, China

Received:2015-09-15 Accepted:2015-09-25 Online:2015-12-01 Published:2015-11-17
Contact: Mingli Sun, Bin Liu, Wei Huang

Abstract

Abstract:

Highly efficient blue phosphorescent organic light-emitting diode (OLED) is achieved by using a blend of biphenyl (spiro[fluorene-9,9'-xanthen]-2-yl) phosphine oxide (SFX2PO) and various of hole- or electron-transporting materials such as di-[4-(N,N-di-p-tolyl-amino)-phenyl]cyclohexane (TAPC), 2,2',2"-(1,3,5-benzinetriyl)-tris(1- phenyl-1-H-benzimidazole) (TPBi) and 4,4',4"-tris(carbazol-9-yl)triphenylamine (TCTA). The results show that TCTA and SFX2PO can partially form exciplex and have better charge carrier balance performance. The driving voltage and efficiency are improved in a multi-player device with TCTA and SFX2PO as the co-host. The device shows a maximum current efficiency of 22.75 cd•A^–1, which is nearly two folds over the device using SFX2PO or phosphine oxide spirobifluorene derivative (SPPO1) as a single host.

Key words: spirofluorene, organic light-emitting diode, co-host, exciplex, bipolar

Mingli Sun, Yuqiao Guan, Bin Liu, Shufen Chen, Yang Zhang, Hongtao Cao, Linghai Xie, Yan Qian, Wei Huang. Spirofluorene-Based Blue Phosphorescent Organic Light-Emitting Diode with Improved Efficiency Using Co-Host Structure[J]. General Chemistry, 2015, 1(1): 3-7.

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Spirofluorene-Based Blue Phosphorescent Organic Light-Emitting Diode with Improved Efficiency Using Co-Host Structure

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