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Applied Physics 2023
基于界面激基复合物主体的WOLED器件光谱性能的研究
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Abstract:
具有高显色指数(CRI)的白光有机发光二极管(WOLED)在照明应用上有着很大的优势。研究器件CRI随各色光强度的变化，以及提高器件的CRI，对OLED在照明应用上有着不小的帮助。在本文中我们提出了基于界面激基复合物主体系统，利用中间层(mCP)来调节激子能量的策略。在此基础上，我们利用蓝色界面激基复合物(mCP/PO-T2T)、黄色界面激基复合物(TAPC/PO-T2T)、绿色磷光材料(Ir(ppy)3)和红色磷光材料(Ir(piq)2(acac))制备了一系列优异性能的WOLED。研究了磷光材料掺杂的量和mCP中间层的厚度对器件性能的影响。结果显示，最大亮度和CRI分别为4862 cd/m2和95。驱动电压从4 V增加到7 V，CIE坐标偏移量仅为(0.044、0.009)。这种简单的结构为利用多种激基复合物实现高CRI和颜色稳定性提供了一种新的方法。
White organic light emitting diode (WOLED) with high color rendering index (CRI) has great advantages in lighting applications. It is of great help for OLED to study the change of CRI of devices with different light intensities and improve the CRI of devices. In this paper, we propose a strategy to adjust exciton energy by using the intermediate layer (mCP) based on the interfacial exciton complex host system. On this basis, we prepared a series of WOLED with excellent properties by using blue interface-exciplex (mCP/PO-T2T), yellow interfacial exciplex (TAPC/PO-T2T), green phosphor (Ir(ppy)3) and red phosphor (Ir(piq)2(acac)). The effects of the doping proportion of phosphorescent materials and the thickness of mCP intermediate layer on the device performance were studied. The results show that the maximum brightness and CRI are 4862 cd/m2 and 95, respectively. The driving voltage is increased from 4 V to 7 V, and the CIE coordinate offset is only (0.044, 0.009). This simple structure provides a new method for realizing high CRI and color stability by using a variety of exciplex complexes.
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