Efficient and Stable Molecular-Aggregate-Based Organic Light-Emitting Diodes with Judicious Ligand Design,Advanced Materials

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Efficient and Stable Molecular-Aggregate-Based Organic Light-Emitting Diodes with Judicious Ligand Design
Advanced Materials ( IF 27.4 ) Pub Date : 2021-07-10 , DOI: 10.1002/adma.202101423
Linyu Cao ₁ , Zhi-Qiang Zhu ₁ , Kody Klimes ₁ , Jian Li ₁

Affiliation

Phosphorescent molecular aggregates show promise in realizing efficient and stable organic light-emitting diodes (OLEDs) operating at high brightness level, which is highly desired for future lighting and display applications. Herein, four tetradentate Pd(II) complexes are prepared with judicious ligand design, and their electrochemical and photophysical properties are thoroughly examined. The studies indicate that slight structural changes of ligands can modify the hole and electron transporting capabilities, and alter the horizontal emitting dipole ratios of aggregates in amorphous film, the latter of which are sensitive to the thin-film deposition conditions including the deposition rate and the choice of the templating layer. An optimized OLED device using Pd3O8-Py5 aggregates exhibits a peak external quantum efficiency (EQE) of 37.3% and a reduced efficiency roll-off with high EQEs of 36.0% and 32.5% at 1000 and 10 000 cd m⁻², respectively. Moreover, such an efficient device demonstrates a long measured LT₉₅ (time to 95% of the initial luminance) lifetime of over 500 h with an initial brightness of 17 304 cd m⁻² corresponding to an estimated LT₉₅ lifetime of 48 246 h at 1000 cd m⁻².

中文翻译：

具有明智配体设计的高效稳定的基于分子聚集体的有机发光二极管

磷光分子聚集体有望实现在高亮度水平下运行的高效稳定的有机发光二极管 (OLED)，这对于未来的照明和显示应用是非常必要的。在此，通过明智的配体设计制备了四种四齿 Pd(II) 配合物，并彻底检查了它们的电化学和光物理性质。研究表明，配体的轻微结构变化可以改变空穴和电子传输能力，并改变非晶膜中聚集体的水平发射偶极子比，后者对薄膜沉积条件敏感，包括沉积速率和模板层的选择。使用 Pd3O8-Py5 聚集体的优化 OLED 器件的峰值外量子效率 (EQE) 为 37。^-2，分别。此外，这样一种高效的器件显示出超过 500 小时的长测量 LT ₉₅（达到初始亮度的 95% 的时间）寿命，初始亮度为 17 304 cd m ^-2，对应于48 246 小时的估计 LT ₉₅寿命1000 cd m ^-2。

更新日期：2021-08-17

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