A promising phosphorescent heteroleptic iridium complex with carbazole-functionalized substituent: Synthesis, photophysical and electroluminescent performances
A promising phosphorescent heteroleptic iridium complex with carbazole-functionalized substituent: Synthesis, photophysical and electroluminescent performances
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DOI：
10.1016/j.optmat.2012.09.002
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发表时间：
2012-12
影响因子：
3.9
通讯作者：
Xiao Li;T. Zang;Lian Yu;Dongyu Zhang;Gonghao Lu;Haijun Chi;Guo-yong Xiao;Yan Dong;Z. Cui;Zhiqiang Zhang;Zhizhi Hu
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文献类型：
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作者：
Xiao Li;T. Zang;Lian Yu;Dongyu Zhang;Gonghao Lu;Haijun Chi;Guo-yong Xiao;Yan Dong;Z. Cui;Zhiqiang Zhang;Zhizhi Hu
一种具有咔唑功能化取代基的杂配铱配合物，设计合成了（cbbt）2 Ir（acac）配合物，其中cbbt为2-（4-（4-（9 H-咔唑-9-基）丁氧基）苯基）苯并[d]噻唑，acac为乙酰丙酮。该配合物在光激发下发出强烈的橙子磷光，具有较高的发光量子效率（0.30）、较短的三重态寿命（0.15μs）和较高的分解温度（310°C）。利用密度泛函理论计算了（cbbt）2 Ir（acac）的电子性质.以（cbbt）2 Ir（acac）为发射极的有机电致发光器件具有优异的橙子电致磷光性能。在高电压（17 V）下达到了17，910 cdm − 2的极高亮度和25.5cdA− 1的最大发光效率。更重要的是，这些器件在10到100 mAcm −2之间表现出30-35%的低效率衰减，这可能是由于（cbbt）2 Ir（acac）的三重态寿命短。
A promising heteroleptic iridium complex with carbazole-functionalized substituent, i.e., (cbbt)2Ir(acac), in which cbbt was 2-(4-(4-(9H-carbazol-9-yl)butoxy)phenyl)benzo[d]thiazole and acac acetylacetonate, was designed, synthesized and structurally characterized. The complex emitted intensely orange phosphorescence upon photoexcitation with high luminescent quantum efficiency (0.30), short triplet lifetime (0.15μs) and high decomposition temperature (310°C). The electronic properties of (cbbt)2Ir(acac) were also examined according to the density functional theory calculations. Organic light-emitting diodes using (cbbt)2Ir(acac) as doped emitter exhibited orange electrophosphorescence with prominent performances. An extremely high brightness of 17,910cdm−2at a high voltage (17V) and a maximum luminance efficiency of 25.5cdA−1were achieved. More importantly, those devices exhibited low efficiency roll-off of 30–35% from 10 to 100mAcm−2, which was probably attributed to the short triplet lifetime of (cbbt)2Ir(acac).