Cyclometalated Ir(III) Complexes for High-Efficiency Solution-Processable Blue PhOLEDs
摘要:
This article reports the systematic functionalization of FIrpic (1) with solubilizing alkyl groups (complexes 2-4) or mesityl groups (complexes 5 and 6). Complex 5 is shown to offer significant advantages over FIrpic (1) in terms of performance of sky-blue polymer-based phosphorescent organic light-emitting diodes (PhOLEDs) with a solution-processed emitting layer (lambda(EL)(max) 477 nm for 5). Devices with 5 doped into poly(vinylcarbazole) (PVK):OXD-7 gave a maximum luminous efficiency of 19.1 cd A(-1) at a brightness of 5455 cd m(2) with EQE 8.7%. Optimized multilayer deviceswith additional TPBi and LiF layers gave 23.7 cd A(-1) and EQE 10.4%. These data compare favorably with leading literature values for sky-blue polymer-based PhOLEDs. The enhanced performance of 5 is ascribed to three main reasons: (i) reduced concentration quenching of 5, (ii) the higher radiative yield of 5; and (iii) improved solubility of 5 in organic solvents. Complex 5 should find widespread use as a soluble blue phosphor for displays and lighting applications using solution processing techniques.
Solubilised bright blue-emitting iridium complexes for solution processed OLEDs
作者:Adam F. Henwood、Ashu K. Bansal、David B. Cordes、Alexandra M. Z. Slawin、Ifor D. W. Samuel、Eli Zysman-Colman
DOI:10.1039/c6tc00151c
日期:——
Combining a sterically bulky, electron-deficient cyclometalating C∧N ligands with an electron rich, highly rigidified N∧N ligand gives an iridium complex, that achieves extraordinarily bright blue emission (ΦPL = 90%; λmax = 459 nm in MeCN) for a cationic iridium complex.
Homochiral Emissive Λ<sub>8</sub>- and Δ<sub>8</sub>-[Ir<sub>8</sub>Pd<sub>4</sub>]<sup>16+</sup>Supramolecular Cages
作者:Diego Rota Martir、Daniel Escudero、Denis Jacquemin、David B. Cordes、Alexandra M. Z. Slawin、Herbert A. Fruchtl、Stuart L. Warriner、Eli Zysman-Colman
DOI:10.1002/chem.201703273
日期:2017.10.12
construction of discrete and well-defined polyhedral nanostructures resembling the spherical shape of large biological systems. In recent years, numerous Archimedean-shaped coordinationcages have been reported based on the assembly of bent monodentate organic ligands containing two or more distal pyridyl rings and square-planar PdII ions. The formation of photoactive PdII metallamacrocycles and cages, however
Exploring the self-assembly and energy transfer of dynamic supramolecular iridium-porphyrin systems
作者:Diego Rota Martir、Gordon J. Hedley、David B. Cordes、Alexandra M. Z. Slawin、Daniel Escudero、Denis Jacquemin、Tamara Kosikova、Douglas Philp、Daniel M. Dawson、Sharon E. Ashbrook、Ifor D. W. Samuel、Eli Zysman-Colman
DOI:10.1039/c6dt02619b
日期:——
present the firstexamples of dynamic supramolecular systems composed of cyclometalated Ir(III) complexes of the form of [Ir(C^N)2(N^N)]PF6 (where C^N is mesppy = 2-phenyl-4-mesitylpyridinato and dFmesppy = 2-(4,6-difluorophenyl)-4-mesitylpyridinato and N^N is 4,4′:2′,2′′:4′′,4′′′-quaterpyridine, qpy) and zinc tetraphenylporphyrin (ZnTPP), assembled through non-covalent interactions between the distal
我们展示了由[Ir(C^N) 2 (N^N)]PF 6形式的环金属化 Ir( III ) 配合物组成的动态超分子系统的第一个例子(其中 C^N 是 mesppy = 2-phenyl-4 -mesitylpyridinato and dFmesppy = 2-(4,6-difluorophenyl)-4-mesitylpyridinato and N^N is 4,4':2',2'':4'',4'''-quaterpyridine, qpy) 和锌四苯基卟啉 (ZnTPP),通过位于铱络合物上的 qpy 配体的远端吡啶部分与 ZnTPP 的锌之间的非共价相互作用组装。这些组件已通过一系列分析技术(1 H NMR 滴定实验、2D COZY 和 HETCOR NMR 光谱以及低温1H NMR光谱)和晶体结构已通过X射线衍射阐明。组件的光电特性以及铱和卟啉发色团单元之间的电子相互作用已经通过详细
申请人:University Court of the University of St. Andrews
公开号:US20160141523A1
公开(公告)日:2016-05-19
Cationic iridium III complexes including a ligand according to formula I are provided. The linking group Z is a hydrocarbylene linking group comprising at least two carbon atoms in a chain. Ligands according to formula I have increased rigidity about the central bond linking the two five membered rings by virtue of the linking group Z, when compared to previous biimidazole related ligands. Increased photoluminescence quantum yield may been obtained in cationic iridium III complexes provided with these ligands.