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首页> 外文期刊>Chemistry: A European journal >High-efficiency tris(8-hydroxyquinoline)aluminum (Alq_3) complexes for organic white-light-emitting diodes and solid-state lighting
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High-efficiency tris(8-hydroxyquinoline)aluminum (Alq_3) complexes for organic white-light-emitting diodes and solid-state lighting

机译：用于有机白色发光二极管和固态照明的高效三（8-羟基喹啉）铝（Alq_3）配合物

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摘要

Combinations of electron-withdrawing and -donating substituents on the 8-hydroxyquinoline ligand of the tris(8-hydroxyquinoline)aluminum (Alq _3) complexes allow for control of the HOMO and LUMO energies and the HOMO-LUMO gap responsible for emission from the complexes. Here, we present a systematic study on tuning the emission and electroluminescence (EL) from Alq_3 complexes from the green to blue region. In this study, we explored the combination of electron-donating substituents on C4 and C6. Compounds 1-6 displayed the emission tuning between 478 and 526 nm, and fluorescence quantum yield between 0.15 and 0.57. The compounds 2-6 were used as emitters and hosts in organic light-emitting diodes (OLEDs). The highest OLED external quantum efficiency (EQE) observed was 4.6 %, which is among the highest observed for Alq_3 complexes. Also, the compounds 3-5 were used as hosts for red phosphorescent dopants to obtain white light-emitting diodes (WOLED). The WOLEDs displayed high efficiency (EQE up to 19 %) and high white color purity (color rendering index (CRI≈85). Whiter than white: Electron-withdrawing and -donating substituents on the tris(8-hydroxyquinoline) Al~(III) (Alq_3) complexes allow for control of the emission and electroluminescence from green (526 nm) to the blue region (487 nm), and of the fluorescence quantum yield (0.15-0.57). The compounds used as emitters in OLEDs show a maximum external quantum efficiency (EQE) of 4.6 %, which is among the highest observed for Alq_3 complexes. The complexes were used in white-light emitting OLEDs achieving high efficiency (EQE ≈19 %) and high white color purity (CRI≈85).
机译：三（8-羟基喹啉）铝（Alq _3）配合物的8-羟基喹啉配体上的吸电子和供电子取代基的组合可控制HOMO和LUMO能量以及负责从该配合物中发射的HOMO-LUMO间隙。在这里，我们提出了一个系统的研究，以调节Alq_3配合物从绿色到蓝色区域的发射和电致发光（EL）。在这项研究中，我们探索了C4和C6上给电子取代基的组合。化合物1-6显示出478至526nm之间的发射调谐，并且荧光量子产率在0.15至0.57之间。化合物2-6用作有机发光二极管（OLED）的发射器和主体。观察到的最高OLED外部量子效率（EQE）为4.6％，在Alq_3配合物中观察到的最高。同样，化合物3-5用作红色磷光掺杂剂的主体，以获得白色发光二极管（WOLED）。 WOLED显示出高效率（EQE高达19％）和高白色纯度（显色指数（CRI≈85）。比白色更白：三（8-羟基喹啉）Al〜（III）上的吸电子和供电子取代基）（Alq_3）配合物可控制从绿色（526 nm）到蓝色区域（487 nm）的发射和电致发光，并控制荧光量子产率（0.15-0.57）。外部量子效率（EQE）为4.6％，在Alq_3配合物中观察到的最高，该配合物用于发白光的OLED中，具有很高的效率（EQE≈19％）和高白色纯度（CRI≈85）。

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