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Inkjet Printing of High-Color-Purity Blue Organic Light-Emitting Diodes with Host-Free Inks.

Hui FangJiale LiShaolong GongJinliang LinGuohua Xie
Published in: Molecules (Basel, Switzerland) (2024)
Inkjet printing technology offers a unique approach to producing direct-patterned pixels without fine metal masks for active matrix displays. Organic light-emitting diodes (OLEDs) consisting of thermally activated delayed fluorescence (TADF) emitters facilitate efficient light emission without heavy metals, such as platinum and iridium. Multi-resonance TADF molecules, characterized by their small full width at half maxima (FWHM), are highly suitable for the requirements of wide color-gamut displays. Herein, host-free TADF inks with a low concentration of 1 mg/mL were developed and inkjet-printed onto a seeding layer, concurrently serving as the hole-transporting layer. Attributed to the proof-of-concept of host-free inks printed on a mixed seeding layer, a maximum external quantum efficiency of 13.1% (improved by a factor of 21.8) was achieved in the inkjet-printed OLED, with a remarkably narrow FWHM of only 32 nm. Highly efficient energy transfer was facilitated by the effective dispersion of the sensitizer around the terminal emitters.
Keyphrases
  • energy transfer
  • highly efficient
  • light emitting
  • heavy metals
  • quantum dots
  • low cost
  • risk assessment
  • air pollution
  • photodynamic therapy
  • molecular dynamics
  • water soluble
  • single molecule