High-efficiency solution-processed green thermally activated delayed fluorescence OLEDs using a polymer-small molecule mixed host

Abstract

Development of suitable host materials for application to an emitter is of significant importance for the high-efficiency organic light-emitting diodes (OLEDs). In this study, we successfully synthesized poly(9,9-diphenyl-10-(4-vinylbenzyl)-9,10-dihydroacridine) (P(Bn-DPAc)) as...

Rational Molecular Design Strategy for Host Materials in Thermally Activated Delayed Fluorescence-OLEDs Suitable for Solution Processing

“…Over the past few decades, many studies have been conducted on solution-processed and vacuum deposition OLEDs. − This is because it is advantageous for low-temperature processability, saving expensive core materials, flexible devices, and large-area applications. In addition, because the materials for the solution process are molecularly designed and synthesized based on various vacuum deposition materials, the two materials are closely related.…”

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.…”

“…Considering these challenges, small molecules, 19–31 sp 3 -cored non-conjugate linker-based dendrimers, 32–37 and polymers 38–42 with a high E T and good solubility have been demonstrated as host materials for solution-processable TADF OLEDs. Several host materials consisting of D–A, D–A–D, or D–A–D′-type architectures have been reported.…”

3PTZ and 3PXZ small molecular hole-transporting materials in polymer light-emitting diodes

“…Spin-coating methods have advantages like their cost-effectiveness and scalability, while in general thermal evaporations have been utilized to deposit the small molecule layers with high purity and an exactly controlled thickness. 7,9,29,30 Although the spin-coated layers were known to exhibit lower quality than thermally evaporated layers, some studies of spin-coated layers show a comparable quality to thermally evaporated ones. 8,10,11,[31][32][33] In this study, we newly apply novel 3PTZ and 3PXZ small molecular materials as HTLs in PLEDs using spin-coating methods.…”