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首页> 美国卫生研究院文献>Materials >The Quantum Efficiency Roll-Off Effect in Near-Infrared Organic Electroluminescent Devices with Iridium Complexes Emitters
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The Quantum Efficiency Roll-Off Effect in Near-Infrared Organic Electroluminescent Devices with Iridium Complexes Emitters

机译：具有铱配合物发射体的近红外有机电致发光器件的量子效率滚降效应

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摘要

The electroluminescence quantum efficiency roll-off in iridium(III)-based complexes, namely Ir(iqbt) (dpm) and Ir(iqbt) (iqbt = 1 (benzo[b]thiophen-2-yl)-isoquinolinate, dpm = 2,2,6,6-tetramethyl-3,5-heptanedionate) utilized as near-infrared emitters in organic light emitting diodes with remarkable external quantum efficiencies, up to circa 3%, 1.5% and 1%, are measured and analyzed. With a 5–6 weight% of emitters embedded in a host matrix, the double-layer solution-processed structure as well as analogous three-layer one extended by a hole-conducting film are investigated. The triplet-polaron, the Onsager electron-hole pair dissociation and the triplet-triplet annihilation approaches were used to reproduce the experimental data. The mutual annihilation of triplets in iridium emitters was identified as prevailingly controlling the moderate roll-off, with the interaction between those of iridium emitters and host matrixes found as being less probable. Following the fitting procedure, the relevant rate constant was estimated to be cm /s, values considered to be rather too high for disordered organic systems, which was assigned to the simplicity of the applied model. A coexistence of some other mechanisms is therefore inferred, ones, however, with a less significant contribution to the overall emission quenching.
机译：基于铱（III）的配合物，即Ir（iqbt）（dpm）和Ir（iqbt）（iqbt = 1（苯并[b]噻吩-2-基）-异喹啉酸酯，dpm = 2）的电致发光量子效率滚降测量和分析了用作有机发光二极管中近红外发射体的（2,6,6-四甲基-3,5-庚二酸酯）（2,6,6-四甲基-3,5-庚二酸酯），具有显着的外部量子效率，最高可达3％，1.5％和1％。通过将5–6 wt％的发射极嵌入主体基质中，研究了双层溶液处理的结构以及由空穴导电膜扩展的类似三层结构。用三重极化子，Onsager电子-空穴对解离和三重三重态hil灭方法重现了实验数据。铱发射体中三重态的相互an灭被认为是主要控制了适度的降落，铱发射体与主体基质之间的相互作用被认为是不太可能的。按照拟合程序，相关速率常数估计为cm / s，对于无序的有机系统而言，该值被认为太高，这被分配为所应用模型的简单性。因此，可以推断出一些其他机制的共存，但是，这些机制对总体排放猝灭的贡献较小。

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