Dopants Induce Persistent Room Temperature Phosphorescence in Triarylamine Boronate Esters

Purely organic materials exhibiting room temperature phosphorescence (RTP) are promising candidates for oxygen sensors and information encryption owing to their cost‐effective and environmentally friendly nature. Herein, we report a bimolecular RTP system where DTBU acts as the guest and TBBU serves...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2024-03, Vol.63 (12), p.e202319089-n/a
Main Authors: Wu, Zhu, Bergmann, Katrina, Hudson, Zachary M.
Format: Article
Language:English
Subjects:
Afterglows
Doping
Energy transfer
Esters
Host-guest
Information encryption
Organic materials
Oxygen
Oxygen probes
Oxygen sensing
Phosphorescence
Room temperature
Room-Temperature Phosphorescence
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Summary:Purely organic materials exhibiting room temperature phosphorescence (RTP) are promising candidates for oxygen sensors and information encryption owing to their cost‐effective and environmentally friendly nature. Herein, we report a bimolecular RTP system where DTBU acts as the guest and TBBU serves as the host. In contrast to previously reported results, we find that both pure DTBU and TBBU do not exhibit RTP in the solid state even under N2 atmosphere. A DTBU/TBBU system with a low doping ratio (0.1 mol %) exhibits persistent yellowish‐green afterglow with a lifetime of 340 ms and is highly sensitive to oxygen. A DTBU/TBBU system with a higher doping ratio (10 mol %) maintains a phosphorescence lifetime of 179 ms under air. Applications of DTBU/TBBU at varied doping ratios in both oxygen sensing and information encryption are demonstrated. We propose that the T1 state of TBBU acts as an energy transfer intermediate between Tn and T1 of DTBU, ultimately leading to the generation of persistent RTP. Overall, this work demonstrates the critical importance of material purity in the design of RTP systems, and how an understanding of host–guest doping enables their photophysical properties to be precisely tuned. Purely organic luminescent material TBBU does not show room temperature phosphorescence (RTP) in the solid state even under N2. When doped with 0.1 mol % DTBU, a persistent yellowish green afterglow can be observed from this binary system in N2 atmosphere. This induced phosphorescence is quite sensitive to oxygen, making the material a candidate for oxygen sensing.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202319089