Bis(phenanthroimidazolyl)biphenyl derivatives as saturated blue emitters for electroluminescent devices

doi:10.1039/B816327H

CNU IR > Pharmacy and Science > Dept. of Food & Drug Industry and Inspective Technology > Periodical Articles > Item 310902800/23298

Please use this identifier to cite or link to this item: https://ir.cnu.edu.tw/handle/310902800/23298

Title:	Bis(phenanthroimidazolyl)biphenyl derivatives as saturated blue emitters for electroluminescent devices
Authors:	Chun-Jung Kuo Ting-Yu Li Chia-Chun Lien Charng-Hsing Liu Fang-Iy Wu Min-Jie Huang
Contributors:	醫藥化學系
Keywords:	Light-Emitting-Diodes Highly Efficient Degradation Mechanism Hole Injection Aggregation Anthracene
Date:	2009
Issue Date:	2010-12-17 16:57:24 (UTC+8)
Publisher:	Royal Soc Chemistry
Abstract:	Blue-emitting bis(phenanthroimidazolyl)biphenyl derivatives, 4,4′-bis(1-phenyl-1H-phenanthro[9,10-d]phenanthroimidazolyl-2-yl)biphenyl (PPIP), 4,4′-bis(1-p-tolyl-1H-phenanthro[9,10-d]phenanthroimidazolyl-2-yl)biphenyl (TPIP) and 4,4′-bis(1-p-anisyl-1H-phenanthro[9,10-d]phenanthroimidazolyl-2-yl)biphenyl (APIP) were effectively synthesized in high yields from commercially available starting materials through a simple two-step procedure without using expensive noble-metal catalysts. These compounds showed excellent thermal properties with a very high glass-transition temperature of 197–200 °C and emitted intense blue light in solution with emission peaks at ca. 428 and 446 nm. By using a different hole-transporting layer, we optimized the electroluminescent efficiencies of the PPIP-based devices. All the PPIP-based devices were turned on at very low applied voltages of <3.0 V and gave pure-blue light with a Commission Internationale d'Énclairage y-coordinate value (CIEy) ≤ 0.15. Among them, device C using TCTA (4,4′,4″-tris(N-carbazolyl)triphenylamine) as the hole-transporting layer reached a very high external quantum efficiency of 6.31% and power efficiency of 7.30 lm/W. When using TPIP or APIP as the emissive layer to replace PPIP in the optimal device C, the resulting devices also exhibited very high external quantum efficiencies of more than 5%, and highly saturated blue light can be obtained from the TPIP-based device with CIEy ≤ 0.10.
Relation:	J. of Materials Chemistry 19(13)：p.1865-1871
Appears in Collections:	[Dept. of Food & Drug Industry and Inspective Technology] Periodical Articles

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