Dissecting Tetra-N-phenylbenzidine: Biphenyl as the Origin of Room Temperature Phosphorescence.,The Journal of Physical Chemistry A

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Dissecting Tetra-N-phenylbenzidine: Biphenyl as the Origin of Room Temperature Phosphorescence.
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2020-01-06 , DOI: 10.1021/acs.jpca.9b09148
Felix Fries ₁ , Marine Louis ₁ , Reinhard Scholz ₂ , Max Gmelch ₁ , Heidi Thomas ₁ , Anna Haft ₁ , Sebastian Reineke ₁

Affiliation

Amorphous purely organic thin films are able to show efficient phosphorescence under ambient conditions at room temperature. This opens the perspective to a wide range of new applications, which have attracted lots of interest in the field of material science recently. Therefore, an increasing number of different molecules displaying room temperature phosphorescence (RTP) have already been reported. Whereas the efficiency, the lifetime, or the oxygen sensitivity is frequently discussed, the origin of RTP mainly remains vague. Often, material design rules tend to the development of increasingly complex structures. Here, the well-known tetra-N-phenylbenzidine (TPD), an archetypical material showing highly efficient fluorescence and RTP, is broken down to its fragments. As the complexity of the system decreases with the molecule's size, spectroscopic investigation of this molecular family enables a deeper understanding of the appearance of RTP. With spectral and time-resolved measurements, RTP can be detected for all compounds containing a biphenyl core, with lifetimes up to 0.9 s under inert gas conditions. These findings form the basis of a deeper understanding of the appearance of RTP in organic molecules and therefore allow for a more focused investigation of new materials.

中文翻译：

解剖四-N-苯基联苯胺：联苯作为室温磷光的起源。

非晶态纯有机薄膜能够在室温下室温下显示出有效的磷光。这为广泛的新应用打开了视野，这些新应用最近在材料科学领域引起了很多兴趣。因此，已经报道了越来越多的显示室温磷光（RTP）的不同分子。尽管经常讨论效率，寿命或对氧气的敏感性，但RTP的起源仍然不清楚。通常，材料设计规则倾向于发展日益复杂的结构。在这里，众所周知的四-N-苯基联苯胺（TPD）是一种具有高效荧光和RTP的原型材料，它被分解成碎片。随着系统的复杂性随着分子大小的减小而降低，通过对该分子家族的光谱学研究，可以更深入地了解RTP的外观。通过光谱和时间分辨测量，可以检测到所有含有联苯核的化合物的RTP，在惰性气体条件下的寿命长达0.9 s。这些发现构成了对RTP在有机分子中外观的更深刻理解的基础，因此可以对新材料进行更集中的研究。

更新日期：2020-01-13

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