A heterocycle fusing strategy for simple construction of efficient solution-processable pure-red thermally activated delayed fluorescence emitters

Abstract

The development of solution-processable pure-red thermally activated delayed fluorescence (TADF) emitters remains a challenging task in the field of organic light-emitting diodes (OLEDs). Here two strong electron acceptor moieties, acenaphtho[1,2-b][1,2,5]oxadiazolo[3,4-e]pyrazine...

High-efficiency deep-red to near-infrared emission from Pt(ii) complexes by incorporating an oxygen-bridged triphenylborane skeleton

“…Organic luminescent materials in the deep-red to near-infrared region have become a hotspot in displays and solid lighting due to their broad applications in night vision displays, information security equipment, photodynamic therapy and organic lightemitting diodes (OLEDs). [1][2][3][4][5][6][7][8][9][10] In the past few decades, a series of highly efficient phosphorescent complexes of iridium (Ir), [11][12][13][14] osmium (Os) [15][16][17][18] and platinum (Pt) [19][20][21][22][23][24][25][26] have been developed by virtue of the heavy atom effect with an intrinsic 100% internal quantum efficiency. However, due to the limitations of the energy gap law and quenching effect in the aggregation state, there are still great difficulties in innovatively developing long-wavelength and high-efficiency near-infrared (NIR) luminescent materials.…”

Recent endeavors and perspectives in developing solution-processable host materials for thermally activated delayed fluorescence organic light-emitting diodes

“…15–23 Solution processing is highly advantageous over vacuum processing owing to the easy processability and usage of low-cost instruments such as spin-coating, blade-casting, and inkjet printing in the former, while avoiding harsh fabrication conditions such as high temperature and pressure. Despite significant progress in the development of solution-processed OLEDs, 24–66 their efficiency and lifetimes still lag behind those of vacuum-processed devices.…”

4-(Aryl)-Benzo[4,5]imidazo[1,2-a]pyrimidine-3-Carbonitrile-Based Fluorophores: Povarov Reaction-Based Synthesis, Photophysical Studies, and DFT Calculations

“…The use of molecules with aggregation-induced emission (AIE) properties, including those with reversible mechanochromism properties, is of great research interest due to their potential applications in biomedical imaging, sensors, and organic light-emitting diodes [29]. Additionally, fluorophores based on acceptor azaheteroarene domains, such as triazoles, oxadiazoles, thiadiazoles, benzothiazoles, quinoxalines, s-or as-triazines, and pyrimidines, are of particular interest [30][31][32][33][34]. Apart from these acceptors, imidazolebased units have been reported as electron acceptors for blue emission acquisition due to their low LUMO energy level [35].…”