以芴及咔唑為主體之有機共軛發光材料之合成與性質

Abstract

利用簡易的合成方法，成功合成出以芴及咔唑為主體之主體(host)發光材料 DFCO 及 DFCN。在咔唑之3號及6號位置引入芴之基團，希望能在結構上增加其熱穩定性，同時限制其共軛長度，使其成為具有高三重態能量之主體發光材料。在電化學上，其具有穩定且可逆的氧化電位。TGA 可達 450 oC，Tg 則可達 180 oC。應用於有機發光二極體之元件上，在摻雜綠光及紅光之磷光材料後，皆有不錯之效率。 利用Suzuki偶合反應合成出具極高分子量之聚芴材料。透過單體分子的特殊設計以及Suzuki聚合條件的最佳化，成功的合成出分子量近九萬之聚芴發光材料。

Herein, we report a series of novel electrophosphorecent host materials which hybridize the structure characteristics of carbazole and fluorene. Combining the properties such as high ambipolar charge carrier mobility of fluorene, and the low carrier injection barrier of carbazole can be reasonably anticipated to afford novel host materials. Through the deliberate molecular design, we can combine both characteristics of carbazole and fluorene independently. In this section, highly efficient and stable green and red eletrophosphorecent devices have been achieved using the compound DFCO as a host material. In the second section, polyfluorenes were synthesized via palladium- catalyzed Suzuki coupling reaction. The introduction of alkoxyphenyl group on the 9-position of fluorene were not only avoid “keto defect” but also provide the solubility of the polymer. The weight average molar mass of PF1 can reach to 90000 and it could be a potential candidate for a pure blue light emitting polymer in PLED devices. PF2 with UV range emission could be a potential UV light emitter in OLED devices.