Dopants Induce Persistent Room Temperature Phosphorescence in Triarylamine Boronate Esters.
Angew Chem Int Ed Engl
; 63(12): e202319089, 2024 Mar 18.
Article
em En
| MEDLINE
| ID: mdl-38277401
ABSTRACT
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 (0.1â
mol %) exhibits persistent yellowish-green afterglow with a lifetime of 340â
ms and is highly sensitive to oxygen. A DTBU/TBBU system with a higher doping ratio (10â
mol %) maintains a phosphorescence lifetime of 179â
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.
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MEDLINE
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En
Ano de publicação:
2024
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Article