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采用9,10-二苯蒽(DPA)作为中心核,一代至三代齐聚咔唑作为外围树枝,设计合成了一系列溶液加工型树枝状深蓝光荧光材料Ent1,Ent2和Ent3.不同于DPA容易在膜态下形成结晶,Ent1~Ent3均具有良好的热稳定性和形态稳定性,玻璃化转变温度高达194~371℃.同时,咔唑树枝的引入,有效地抑制了分子间的相互作用,使得膜态下荧光量子效率从Ent1的46%提高至Ent2的52%和Ent3的67%.通过旋涂工艺制备了深蓝光非掺杂器件,发现第二代树枝状荧光材料Ent2表现出最优器件性能,发光效率为2.63 cd/A,色坐标CIE_((x,y))为(0.16,0.10).
A series of solution-processing dendritic dark blue fluorescent materials, Ent1, Ent2 and Ent3, were designed and synthesized using 9,10-diphenylanthracene (DPA) as the central nucleus and one to three generations of oligomeric carbazoles as the peripheral branches. Unlike DPA, Ent1 ~ Ent3 have good thermal stability and morphological stability, the glass transition temperature is as high as 194 ~ 371 ℃ .At the same time, the introduction of carbazole branches, which effectively inhibit the intermolecular interaction, The fluorescence quantum efficiency in the film state was raised from 46% of Ent1 to 52% of Ent2 and 67% of Ent3.The dark blue non-doped device was prepared by spin-coating process and the second generation dendritic fluorescent material Ent2 was found to be the best Device performance, luminous efficiency of 2.63 cd / A, color coordinates CIE _ ((x, y)) is (0.16, 0.10).