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Dissecting Tetra- N-phenylbenzidine: Biphenyl as the Origin of Room Temperature Phosphorescence

Dissecting Tetra- N-phenylbenzidine: Biphenyl as the Origin of Room Temperature Phosphorescence

Felix Fries, Marine Louis, Reinhard Scholz, Max Gmelch, Heidi Thomas, Anna Haft, Sebastian Reineke

J Phys Chem A. 2020 Jan 23;124(3):479-485.

PMID: 31905283

Abstract:

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP15546437	Tetra-N-phenylbenzidine		15546-43-7	Price

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