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Optimized Synthesis of Solution-Processable Crystalline Poly(Triazine Imide) with Minimized Defects for OLED

David Burmeister¹, Ha Anh Tran¹, Johannes Müller²

¹Department of Chemistry, Department of Physics, IRIS Adlershof, Humboldt-Universität zu Berlin, Zum Grossen Windkanal 2, 12489, Berlin, Germany.

Angewandte Chemie (International Ed. in English)

|October 11, 2021

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Optimized synthesis of poly(triazine imide) (PTI) reduces detrimental carbon phases, enhancing its performance for electronic devices. This research enables metal-free organic light-emitting diode (OLED) prototypes using improved PTI materials.

Area of Science:

Materials Science
Organic Electronics
Semiconductor Physics

Background:

Poly(triazine imide) (PTI) is a crystalline semiconductor with potential for thin-film devices.
Conventional synthesis produces carbon-rich by-products that impede charge transport and photoluminescence.

Purpose of the Study:

To optimize PTI synthesis for improved material quality and device performance.
To investigate the structure-property relationships in PTI, focusing on defect mitigation.
To develop metal-free organic light-emitting diode (OLED) prototypes using PTI.

Main Methods:

Optimized chemical synthesis protocol for PTI.
Characterization of PTI material properties, including charge transport and photoluminescence.
Fabrication and testing of an OLED prototype utilizing PTI as the active layer.

Keywords:

covalent organic framework crystalline carbon nitride ionothermal synthesis layered materials metal-free semiconductor

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Main Results:

An optimized synthetic route significantly reduced detrimental carbon-rich phases in PTI.
Improved PTI exhibited enhanced quantum yield, photocurrent, and electroluminescence.
Protonation of PTI was observed to improve quantum yield and exciton lifetimes.

Conclusions:

Mitigating carbon-rich defects is crucial for enhancing PTI's optoelectronic properties.
Protonation plays a role in improving PTI's performance and layer exfoliation.
This work paves the way for metal-free OLEDs based on optimized poly(triazine imide).