P‐165: Highly Efficient Ink‐Jet Printed Small Molecular Phosphorescent OLEDs

Abstract

We studied efficient light emission from printed small molecular electrophosphorescent OLEDs (PHOLEDs). The organic layer was made by ink‐jetting with a composite solution, prepared by dissolving small molecular compounds into mixed solvents. Efficient green light emissions were generated at relatively low voltages; the peak luminance over ∼50,000 cd/m2 with the peak current efficiency of 45 cd/A.

Light‐Emitting Microinlaid Spots Produced through Lateral Phase Separation by Means of Simple Single‐Inkjet Printing

“…[ 1–9 ] Due to such advantages, the effective micropatterning of functional components has been demonstrated for various applications in the display, [ 10–12 ] semiconductor, [ 13–19 ] and biomedical industries, [ 20,21 ] as well as in the conventional graphics industry. In relation to these applications, a number of studies of inkjet printing have sought to realize uniform pixel formation and patterning for solution‐processable light‐emitting diodes (LEDs) that utilize not only organic semiconducting materials [ 10–12,22–33 ] but also quantum dots (QDs). [ 34–37 ] As recent examples, by the precise deposition of droplets using the drop‐on‐demand inkjet‐printing technique, thin red‐ (R), green‐ (G), blue‐ (B), and/or white‐emitting material layer (EML) pixels were fabricated for high‐performance light‐emitting pixel arrays of organic LEDs (OLEDs) as well as QD LEDs (QD‐LEDs).…”

Crystal Growth of Anthracene by Dip Coating and Application for Organic Electroluminescence Devices

“…5) In addition, the LMWMs have a long life for emitting. 6) However, normally to deposit the LMWMs, expensive evaporation equipment is required. In the case of the EL devices using HMWMs, the fabrication process is quite simple, where the HMMs are accumulated using the spin coating and/or dipping technique.…”