Triphenylamine-based trinuclear Pt(II) complexes for solution-processed OLEDs displaying efficient pure yellow and red emissions
Triphenylamine-based trinuclear Pt(II) complexes for solution-processed OLEDs displaying efficient pure yellow and red emissions
复制标题
基于三苯胺的三核 Pt(II) 络合物，用于溶液处理的 OLED，显示高效的纯黄色和红色发射
DOI：
10.1016/j.orgel.2021.106101
复制
发表时间：
2021-02-12
影响因子：
3.2
通讯作者：
Yang, Xiaolong
中科院分区：
文献类型：
--
作者：
Sun, Yuanhui;Liu, Bochen;Yang, Xiaolong
高效的磷光体在溶液处理的有机发光器件（OLED）中至关重要。含多个金属中心的多核Ir（III）配合物在制备高性能有机电致发光器件方面显示出巨大的潜力，但对多核Pt（II）配合物的电致发光性能研究较少。在这项工作中，两个中性三核铂（II）配合物的基础上，三苯胺核轴承三个双齿配体臂合成。与相应的单核Pt（II）配合物相比，黄色发射体（PyTPt）和深红色发射体（IqTPt）都表现出改善的光致发光量子产率（PLQYs）。此外，PyTPt和IqTPt掺杂的薄膜的PLQY分别增加到0.63和0.47。基于PyTPt的溶液处理的纯黄色发光器件实现了令人印象深刻的高外量子效率（EQE），电流效率（CE），和功率效率（PE）的16.92%，56.74 cd/A和29.09 lm W？1，分别是其中最好的性能报道的OLED采用多核Pt（II）配合物。基于IqTPt的溶液处理的器件显示出纯红色发射，峰值EQE接近9.0%。PyTPt和IqTPt都显示出比它们相应的单核Pt（II）络合物高得多的EL效率。本工作表明，这是一个消耗策略，开发多核铂（II）配合物的高性能OLED。
Highly efficient phosphors are critical in solution-processed organic light-emitting devices (OLEDs). Multinuclear Ir(III) complexes containing more than one metal center have showed great potential in fabricating high performance OLEDs, yet the electroluminescent (EL) properties of multinuclear Pt(II) complexes are rarely studied. In this work, two neutral trinuclear Pt(II) complexes are synthesized based on the triphenylamine core bearing three bidentate ligand arms. Both the yellow emitter (PyTPt) and deep-red emitter (IqTPt) exhibit improved photoluminescent quantum yields (PLQYs) compared with their corresponding mononuclear Pt(II) complexes. Furthermore, the PLQYs of PyTPt and IqTPt doped films are increased to 0.63 and 0.47, respectively. The solution-processed pure yellow-emitting device based on PyTPt achieves impressively high external quantum efficiency (EQE), current efficiency (CE), and power efficiency (PE) of 16.92%, 56.74 cd/A and 29.09 lm W? 1, respectively, which are among the best performance reported for the OLEDs employing multinuclear Pt(II) complexes. The solution-processed device based on IqTPt shows pure red emission with the peak EQE approaching 9.0%. Both PyTPt and IqTPt display much higher EL efficiencies than their corresponding mononuclear Pt(II) complexes. This work demonstrates that it is an attritive strategy to develop multinuclear Pt(II) complexes for high-performance OLEDs.