|Efficient Solution-Processed Organic Light-Emitting Diodes (OLEDs) Enabled by Orthogonal Solvent Approach|
: 159 : 2019.05.30 16:53
|일시 : 2019.05.29 17:00|
|소속 : 홍익대학교 화학공학과|
|발표자 : 엄태식|
|장소 : R404|
Organic electronics, commonly referred as plastic electronics, is an emerging technology for addressing many challenges that our society is facing. Over the past two decades, organic electronics has gained enormous attention due to its many advantages, including low power consumption, low-cost, scalable, and flexible design. Development of high-performance devices by designing new materials and device engineering is crucial to the future advances in organic electronics. My talk will focus on studies of organic light-emitting diodes (OLEDs) fabricated by solution-processing of organic semiconductors, aims to better understand structure-propertyperformance relationships resulting from solution-based fabrication.
Studies of bisindenoanthrazolines and dendritic oligoquinolines were found to be promising new electron-transport materials (ETMs) for high-performance phosphorescent OLEDs (PhOLEDs). Solution-processed multilayered blue PhOLEDs with orthogonal solution-processed ETMs were found to have the highest efficiency (luminous efficiency = 28.3 cd/A and external quantum efficiency = 15.5 %) observed among polymer-based devices. The surface morphology and charge-transport properties of the ETMs were successfully tuned by solution-deposition, which made it possible to eliminate the need for interfacial materials and low work function metals commonly used as cathode materials in OLEDs. High-performance solution-processed PhOLEDs using commercial ETMs were also demonstrated using orthogonal solution-processing. The bulk conductivity and charge transport properties of ETMs were enhanced by a novel solution n-doping with alkali metal salts.