14 November 2007 Novel hole blocking material for organic light-emitting devices
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Proceedings Volume 6722, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 67221L (2007) https://doi.org/10.1117/12.783010
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China
Abstract
Two novel boron complexes, i.e, bis (dimesitylboron) stilbene (DMBSB) and bis (dimesitylboronphenyl) acetylene (DMBPA) with the lowest unoccupied molecular orbital (LUMO) of 3.0 eV and the highest occupied molecular orbital (HOMO) of about 6.3 eV.are reported in the paper. Compared to bathocuproine (BCP), the characteristics of two novel materials as hole blocking layer (HBL) were studied in triple layer organic light-emitting devices (OLEDs). The OLEDs were fabricated by conventional thermal vacuum deposition using N, N'-biphenyl-N, N'-bis-(1-naphenyl)-1, 1'-biphenyl -4, 4'-diamine (NPB) as a hole transporting layer (HTL), and tris (8-hydroxyquinolinato) aluminum (Alq) as an electron transport layer (ETL). The results showed that DMBSB efficiently confines the exciton recombination zone into the HTL (NPB layer), and the devices have a current density of 600 mA/cm2 at 19.5 V with a luminance of 504 cd/m2, and a turn-on voltage of 7.7 V. The device of DMBPA material as the HBL has green light emission even with current density of 532 mA/cm2 and a maximum luminance of 1000 cd/m2 at 20 V, and a turn-on voltage of 7.9 V. The electroluminescent (EL) spectrum showed an emission peak at 516 nm with a shoulder at 429 nm, corresponding to CIE coordinates of (0.28, 0.40), which indicates that light emission from Alq layer and NPB layer occurres simultaneously.
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Junsheng Yu, Shuangling Lou, Yadong Jiang, Lu Li, Qing Li, Xiaowei Zhan, "Novel hole blocking material for organic light-emitting devices", Proc. SPIE 6722, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 67221L (14 November 2007); doi: 10.1117/12.783010; https://doi.org/10.1117/12.783010
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