期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 3, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202111749
关键词
covalent organic framework; crystalline carbon nitride; ionothermal synthesis; layered materials; metal-free semiconductor
资金
- European Research Council (ERC) [BEGMAT-678462]
- German Research Foundation (DFG) [182087777-CRC 951]
- German Federal Ministry of Education and Research (Professorinnenprogramm III)
- State of Lower Saxony (Professorinnen fur Niedersachsen)
- DFG [INST 184/157-1 FUGG]
- Ministry of Science and Culture of Lower Saxony
- Senatsverwaltung Berlin
- European Union [EFRE 1.8/07]
- Projekt DEAL
Poly(triazine imide) (PTI) is a highly crystalline semiconductor with potential for thin layer device applications. Protonation of PTI structure at pyridinic N atoms of the triazine rings can lead to exfoliation of layers and improvement in quantum yield and exciton lifetimes. Avoiding the detrimental C-C carbon-rich phase from conventional synthesis methods can enhance the optical and electronic performance of PTI.
Poly(triazine imide) (PTI) is a highly crystalline semiconductor, and though no techniques exist that enable synthesis of macroscopic monolayers of PTI, it is possible to study it in thin layer device applications that are compatible with its polycrystalline, nanoscale morphology. We find that the by-product of conventional PTI synthesis is a C-C carbon-rich phase that is detrimental for charge transport and photoluminescence. An optimized synthetic protocol yields a PTI material with an increased quantum yield, enabled photocurrent and electroluminescence. We report that protonation of the PTI structure happens preferentially at the pyridinic N atoms of the triazine rings, is accompanied by exfoliation of PTI layers, and contributes to increases in quantum yield and exciton lifetimes. This study describes structure-property relationships in PTI that link the nature of defects, their formation, and how to avoid them with the optical and electronic performance of PTI. On the basis of our findings, we create an OLED prototype with PTI as the active, metal-free material.
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