| 含三氟乙酰苯基喹啉配体的铱配合物的合成及其电致发光性能 |
| Synthesis and Electroluminescence Properties of Iridium Complex Based on Trifluoroacetylphenyl Quinolone Ligand |
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| 摘要: 通过2-(4'-三氟乙酰苯基)-4-苯基喹啉(tfapqH)与三氯化铱反应生成了二氯桥中间体,然后用吡啶-2-甲酸(picH)解离得到双环金属铱配合物Ir(tfapq)2pic。Ir(tfapq)2pic在二氯甲烷中的发光波长为584 nm,量子产率约为0.846,磷光寿命为1.211 μs,比没有三氟乙酰修饰的铱配合物波长蓝移的10 nm,量子效率提高了约5%,磷光寿命降低了0.286 μs,辐射跃迁加快,半波宽度降低了约26%,色纯度提高。其HOMO能级为-5.405 eV,LUMO能级为-3.277 eV,能级相对于未修饰的配合物都有所降低,且HOMO降低更明显,总的效果是能级差增加。Ir(tfapq)2pic 10%的热失重温度为301 ℃,比未修饰铱配合高近50 ℃。当Ir(tfapq)2pic以2%质量浓度掺杂于PVK-PBD中做成电致发光器件时的效率最高,电致发光波长为594 nm。器件的启明电压为7.3 V,最大亮度为8 571 cd·m-2,最大外量子效率为12.65%,对应的流明效率为22.14 cd·A-1。色坐标是(0.58,0.40)。 |
| 关键词: 环金属铱配合物 三氟乙酰苯基喹啉 有机电致发光 |
| 基金项目: 国家自然科学基金(No.21572001)、安徽省高校自然科学研究项目(No.KJ2013A063)、安徽省大学生创新创业训练计划(No.201510360119) 资助项目。 |
| Abstract: A cyclometallated IrⅢ-μ-chloro-bridged dimer was synthesized by the reaction of a trifluoroacetylphenyl quinoline derivative and IrCl3. Then bicyclometalated iridium complex Ir(tfapq)2pic was synthesized by the reaction between dimer and picolinic acid. Ir(tfapq)2pic emitted a strong phosphorescence centered at 584 nm in a CH2Cl2 solution. Its lifetime is 1.211 μs and quantum yield is approximately 0.846 in a CH2Cl2 solution. Compared with the unmodified iridium complex, Ir(tfapq)2pic have a blue shift emission wavelength, sharp peak, higher quantum yield and shorter lifetime. The HOMO energy level is -5.405 eV and LUMO is -3.277 eV, which both lower than that of unmodified iridium complex and the greater energy band. The 10% weight loss temperature of Ir(tfapq)2pic is 301 ℃, which 50 ℃ higer than that of unmodified iridium complex. The organic light-emitting device based on Ir(tfapq)2pic (2wt% doped in PVK-PBD film) exhibits the best efficiency. It's peak electrophosphorescence wavelength is 594 nm. Its maximum external quantum efficiency is 12.65% and the corresponding efficiency is 22.14 cd·A-1. The maximum luminance is 8 571 cd·m-2. The turn-on voltage is 7.3 V with the Commission Internationale de L'Eclairage (CIE) coordinates of (0.58, 0.40). |
| Keywords: cyclometalated iridium complex trifluoroacetylphenyl quinoline organic electroluminescence |
| 投稿时间：2015-05-07 修订日期：2015-09-24 |
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| 陈熳,王雪梅,何禹亨,杨建,王松,童碧海.含三氟乙酰苯基喹啉配体的铱配合物的合成及其电致发光性能[J].无机化学学报,2015,31(12):2285-2290. |
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