Novel Carbazole/Fluorene-Based Host Material for Stable and Efficient Phosphorescent OLEDs
Novel Carbazole/Fluorene-Based Host Material for Stable and Efficient Phosphorescent OLEDs
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用于稳定高效磷光 OLED 的新型咔唑/芴基主体材料
DOI：
10.1021/acsami.9b13245
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发表时间：
2019-10-30
影响因子：
9.5
通讯作者：
Li, Jian
中科院分区：
文献类型：
--
作者：
Li, Guijie;Zheng, Jianbing;Li, Jian
通过利用间位取代的苯基作为连接基，开发了一种具有高三线态能量的“M”型咔唑/芴基 mDCzPF 的新型主体材料。结果表明，取代基的位置显着影响分子构型和偶极矩，这对器件性能起着至关重要的作用。由于 mDCzPF 良好的电荷传输能力，使用“M”型 mDCzPF 作为主体的红色磷光 OLED 比使用通过对位取代的苯基连接的“V”型 pDCzPF 作为主体的 OLED 的工作寿命提高了 10 倍。此外，“M”型 mDCzPF 主体还与蓝色磷光发射体 PtNON 兼容。使用 mDCzPF 作为主体的 PtNON 掺杂 OLED 表现出 18.3% 的峰值 EQE 和较小的滚降，但在 5000 cd/m(2) 的高亮度下仍保持 13.3% 的 EQE。因此，新型“M”型mDCzPF可以用作稳定的主体材料，用于在整个可见光谱范围内高效发光的OLED。这项研究为设计新主体材料以开发稳定高效的磷光 OLED 提供了一种可行的方法。
A novel host material of "M"-type carbazole/fluorene-based mDCzPF with a high triplet energy by utilizing meta-substituted phenyl groups as linkers was developed. It was demonstrated that the position of the substituents significantly affected the molecular configuration and dipole moment, which played a critical role in the device performances. Red phosphorescent OLED utilizing the "M"-type mDCzPF as the host represented a 10-fold operational lifetime improvement over the OLED using a "V"-type pDCzPF linked by para-substituted phenyl groups as the host because of the good charge transport ability of the mDCzPF. Additionally, the "M"-type mDCzPF host was also compatible with a blue emitting phosphorescent emitter PtNON. The PtNON-doped OLED using mDCzPF as the host exhibited a peak EQE of 18.3% with a small roll off, yet maintained an EQE of 13.3% at a high brightness of 5000 cd/m(2). Thus, the novel "M"-type mDCzPF could be employed as stable host material for efficient OLED emitting across the whole visible spectrum. This study should provide a viable method for designing new host materials for the development of stable and efficient phosphorescent OLEDs.