High-Performance Red, Green, and Blue Electroluminescent Devices Based on Blue Emitters with Small Singlet-Triplet Splitting and Ambipolar Transport Property

doi:10.1002/adfm.201202981

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	High-Performance Red, Green, and Blue Electroluminescent Devices Based on Blue Emitters with Small Singlet-Triplet Splitting and Ambipolar Transport Property
	Wang, Kai 1; Zhao, Fangchao 2; Wang, Chenguang 1; Chen, Shanyong 1; Chen, Dong 1; Zhang, Hongyu 1; Liu, Yu 1; Ma, Dongge 2; Wang, Yue 1
刊名	ADVANCED FUNCTIONAL MATERIALS
	2013-06-06
卷号	23 期号:21 页码:2672-2680
关键词	Ambipolar Transport Electroluminescence Emission Color Singlet-triplet Splitting Organic Light-emitting Diodes
ISSN号	1616-301X
DOI	10.1002/adfm.201202981
英文摘要	Two coordination complex emitters as well as host materials Be(PPI)2 and Zn(PPI)2 (PPI = 2-(1-phenyl-1H-phenanthro[9,10-d]imidazol-2-yl)phenol) are designed, synthesized, and characterized. The incorporation of the metal atom leads to a twisted conformation and rigid molecular structure, which improve the thermal stability of Be(PPI)2 and Zn(PPI)2 with high Td and Tg at around 475 and 217 degrees C, respectively. The introduction of the electron-donating phenol group results in the emission color shifting to the deep-blue region and the emission maximum appears at around 429 nm. This molecular design strategy ensures that the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) HOMO and LUMO of Be(PPI)2 and Zn(PPI)2 localize on the different moieties of the molecules. Therefore, the two complexes have an ambipolar transport property and a small singlet-triplet splitting of 0.35 eV for Be(PPI)2 and 0.21 eV for Zn(PPI)2. An undoped deep-blue fluorescent organic light-emitting device (OLED) that uses Be(PPI)2 as emitter exhibits a maximum power efficiency of 2.5 lm W-1 with the CIE coordinates of (0.15, 0.09), which are very close to the National Television Standards Committee (NTSC) blue standard (CIE: 0.14, 0.08). Green and red phosphorescent OLEDs (PhOLEDs) that use Be(PPI)2 and Zn(PPI)2 as host materials show high performance. Highest power efficiencies of 67.5 lm W-1 for green PhOLEDs and 21.7 lm W-1 for red PhOLEDs are achieved. In addition, the Be(PPI)2-based devices show low-efficiency roll-off behavior, which is attributed to the more balanced carrier-transport property of Be(PPI)2.
语种	英语
出版者	WILEY-V C H VERLAG GMBH
WOS记录号	WOS:000319824200001
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/46945]
专题	中国科学院化学研究所
通讯作者	Wang, Kai
作者单位	1.Jilin Univ, Coll Chem, State Key Lab Supramol Struct & Mat, Changchun 130012, Peoples R China 2.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
推荐引用方式 GB/T 7714	Wang, Kai,Zhao, Fangchao,Wang, Chenguang,et al. High-Performance Red, Green, and Blue Electroluminescent Devices Based on Blue Emitters with Small Singlet-Triplet Splitting and Ambipolar Transport Property[J]. ADVANCED FUNCTIONAL MATERIALS,2013,23(21):2672-2680.
APA	Wang, Kai.,Zhao, Fangchao.,Wang, Chenguang.,Chen, Shanyong.,Chen, Dong.,...&Wang, Yue.(2013).High-Performance Red, Green, and Blue Electroluminescent Devices Based on Blue Emitters with Small Singlet-Triplet Splitting and Ambipolar Transport Property.ADVANCED FUNCTIONAL MATERIALS,23(21),2672-2680.
MLA	Wang, Kai,et al."High-Performance Red, Green, and Blue Electroluminescent Devices Based on Blue Emitters with Small Singlet-Triplet Splitting and Ambipolar Transport Property".ADVANCED FUNCTIONAL MATERIALS 23.21(2013):2672-2680.