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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Highly efficient thermally activated delayed fluorescence emitters enabled by double charge transfer pathways via ortho-linked triarylboron/carbazole hybrids
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Highly efficient thermally activated delayed fluorescence emitters enabled by double charge transfer pathways via ortho-linked triarylboron/carbazole hybrids

机译：高效的热活化延迟荧光发射器，通过双电荷转移途径通过邻右连接的三芳基团/咔唑杂种

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摘要

Two thermally activated delayed fluorescence (TADF) emitters with double charge transfer pathways, oB-2Cz and oB-2tCz, were designed and synthesized. The phenyl linker allowed the charge to transfer from donors to acceptors along with the bond direction within the molecule; however, the ortho-linked D-A-D configuration with bulky steric hindrance resulted in large D-A dihedral angles, rigid structure and cofacial interactions with small D-A spatial distances, which are favorable for minimizing the lowest singlet and the lowest triplet energy gap (Delta E-ST) and improving the photoluminescent efficiencies. oB-2Cz and oB-2tCz were employed as emissive guest in the organic light emitting diode (OLED) devices and the maximum external quantum efficiencies (EQEs) of the devices reached 28.1% and 27.5%, respectively.
机译：设计并合成了两种具有双电荷转移途径的热激活延迟荧光（TADF）发射器oB-2Cz和oB-2tCz。苯基连接体允许电荷沿着分子内的键方向从供体转移到受体；然而，具有巨大空间位阻的正交连接D-A-D构型导致了较大的D-A二面角、刚性结构和具有较小D-A空间距离的共相相互作用，这有利于最小化最低单重态和最低三重态能隙（δE-ST），并提高光致发光效率。在有机发光二极管（OLED）器件中，采用oB-2Cz和oB-2tCz作为发射客体，器件的最大外量子效率（EQE）分别达到28.1%和27.5%。

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