Burmeister, D.; Tran, H.A.; Müller, J.; Guerrini, M.; Cocchi, C.; Plaickner, J.; Kochovski, Z.; List-Kratochvil, E. J. W.; Bojdys, M. J.: Optimierte Synthese von in Lösung verarbeitbarem kristallinem Poly(triazinimid) mit minimalen Defekten für OLED-Anwendungen. Angewandte Chemie 134 (2022), p. e202111749/1-8
10.1002/anie.202111749
Open Access Version
Abstract:
Poly(triazine imide) (PTI) is a highly crystallinesemiconductor, and though no techniques exist that enablesynthesis of macroscopic monolayers of PTI, it is possible tostudy it in thin layer device applications that are compatiblewith its polycrystalline, nanoscale morphology. We find that theby-product of conventional PTI synthesis is a CC carbon-richphase that is detrimental for charge transport and photo-luminescence. An optimized synthetic protocol yields a PTImaterial with an increased quantum yield, enabled photo-current and electroluminescence. We report that protonation ofthe PTI structure happens preferentially at the pyridinicN atoms of the triazine rings, is accompanied by exfoliationof PTI layers, and contributes to increases in quantum yieldand exciton lifetimes. This study describes structure–propertyrelationships in PTI that link the nature of defects, theirformation, and how to avoid them with the optical andelectronic performance of PTI. On the basis of our findings, wecreate an OLED prototype with PTI as the active, metal-freematerial.