具咔唑基團及磷氧基團之雙偶極性有機發光二極體主體材料

Phenylcarbazole-Based Phosphine Oxide Bipolar Host Materials For Organic Light-Emitting Diodes

洪豪志(Hao-Chih Hung) ； 張永育(Yung-Yu Chang) ； 呂曉風(Hsiao-Feng Lu) ； 潘正彥(Cheng-Yen Pan) ； 洪曉雯(Hsiao-Wen Hung)

《化學》 70卷3期 (2012/09) Pp. 281-292

https://doi.org/10.6623/chem.2012025

摘要

我們以磷氧基團作為電子受體，電子予體則是使用傳遞電洞性質極佳的咔唑基團，設計出PO1及PO2兩種具有雙偶極性的主體材料，HOMO/LUMO分別為5.75/2.06 eV及5.55/1.96 eV，另外在玻璃轉移溫度以及熱裂解溫度上，PO1及PO2表現出優異的熱穩定性質，PO2的玻璃轉換溫度更高達151°C。同時利用吸收光譜以及放光光譜儀檢測材料基本性質，並輔以密度泛函理論進行理論計算，證實所設計的化合物具有雙偶極性的主體材料特有的光誘導電子移轉，已由許多已發表的優異之主體材料文獻中，證實此類材料在可幫助電子與電洞在主體材料中之傳輸並再結合，希望用此來增益元件效果。

關鍵字

有機發光二極體 ； 雙偶極性主體材料 ； 密度乏函理論

並列摘要

In this study, we synthesized two new bipolar host materials (PO1 and PO2), in which phosphine oxide and carbazole groups were incorporated as electron acceptor and donor moieties, respectively. HOMO/LUMO energy levels of PO1 and PO2 were 5.75/2.06 eV and 5.55/1.96 eV, respectively. These host materials possess excellent thermal stability; PO2 exhibits a high glass transition temperature (Tg) of up to 151 °C. We analyze optical properties of materials through absorption and emission spectrophotometer, and then use density functional theory (DFT) to confirm that the host materials possess photoinduced electron transfer characteristic. We expect that efficiency of devices would be enhanced through incorporating these host materials due to better transition and recombination of electron and hole in host materials.

並列關鍵字

Organic light-emitting diodes ； Bipolar host materials ； Density functional theory