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	Toward Highly Efficient Solid-State White Light-Emitting Electrochemical Cells: Blue-Green to Red Emitting Cationic Iridium Complexes with Imidazole-Type Ancillary Ligands
	He, Lei ; Qiao, Juan ; Duan, Lian ; Dong, Guifang ; Zhang, Deqiang ; Wang, Liduo ; Qiu, Yong
	2010-10-12 ; 2010-10-12
关键词	INTERNAL QUANTUM EFFICIENCY TRANSITION-METAL-COMPLEXES ELECTROLUMINESCENT DEVICES SINGLE-LAYER III COMPLEXES IONIC LIQUIDS (2,2'-BIPYRIDINE)IRIDIUM(III) DENSITY Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter
中文摘要	Using imidazole-type ancillary ligands, a new class of cationic iridium complexes (1-6) is prepared, and photophysical and electrochemical studies and theoretical calculations are performed. Compared with the widely used bpy (2,2'-bipyridine)-type ancillary ligands, imidazole-type ancillary ligands can be prepared and modified with ease, and are capable of blueshifting the emission spectra of cationic iridium complexes. By tuning the conjugation length of the ancillary ligands, blue-green to red emitting cationic iridium complexes are obtained. Single-layer light-emitting electrochemical cells (LECs) based on cationic iridium complexes show blue-green to cells electroluminescence. High efficiencies of 8.4, 18.6, and 13.2 cd A(-1) are achieved for the blue-green-emitting, yellow-emitting, and orange-emitting devices, respectively. By doping the red-emitting complex into the blue-green LEC, white LECs are realized, which give warm-white light with Commission Internationale de L'Eclairage (CIE) coordinates of (0.42, 0.44) and color-rendering indexes (CRI) of up to 81. The peak external quantum efficiency, current efficiency, and power efficiency of the white LECs reach 5.2%, 11.2 cd A(-1), and 10 lm W-1, respectively, which are the highest or white LECs reported so far, and indicate the great potential for the use of these cationic iridium complexes in white LECs.
语种	英语 ; 英语
出版者	WILEY-V C H VERLAG GMBH ; WEINHEIM ; PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/80799]
专题	清华大学
推荐引用方式 GB/T 7714	He, Lei,Qiao, Juan,Duan, Lian,et al. Toward Highly Efficient Solid-State White Light-Emitting Electrochemical Cells: Blue-Green to Red Emitting Cationic Iridium Complexes with Imidazole-Type Ancillary Ligands[J],2010, 2010.
APA	He, Lei.,Qiao, Juan.,Duan, Lian.,Dong, Guifang.,Zhang, Deqiang.,...&Qiu, Yong.(2010).Toward Highly Efficient Solid-State White Light-Emitting Electrochemical Cells: Blue-Green to Red Emitting Cationic Iridium Complexes with Imidazole-Type Ancillary Ligands..
MLA	He, Lei,et al."Toward Highly Efficient Solid-State White Light-Emitting Electrochemical Cells: Blue-Green to Red Emitting Cationic Iridium Complexes with Imidazole-Type Ancillary Ligands".(2010).

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