Professor of Chemical Engineering
ORGANIC LIGHT-EMITTING MATERIALS
Organic light-emitting materials are key materials of organic light-emitting diodes because device performances of organic light-emitting diodes are dominantly decided by the organic light-emitting materials. Several classes of emitting materials are being developed for high performance devices. Fluorescent, phosphorescent, thermally activated delayed fluorescent materials are being developed for advanced organic light-emitting diodes. Molecular design, molecular simulation, synthesis, purification and analysis of organic emitting materials are being carried out to develop the state of the art light-emitting materials.
HIGH EFFICIENCY AND LONG LIFETIME ORGANIC LIGHTE-MITTING DIODES
Device engineering of the organic light-emitting diodes is very important to realize high efficiency and long lifetime devices. In particular, device work about blue phosphorescent and thermally activated delayed fluorescent organic light-emitting diodes is of vital importance to develop high efficiency and long lifetime blue devices. New device architecture to achieve state of the art device performances is being developed by managing carrier transport, exciton formation and exciton-polaron interaction. Additionally, development of solution processed organic light-emitting diodes by engineering crosslinkable hole transport layer and emitting material is also being carried out to develop high performance solution based devices.
1. J. Y. Lee et al. “Stable Blue Thermally Activated Delayed Fluorescent Organic Light-Emitting Diodes with Three Times Longer Lifetime than Phosphorescent Organic Light-Emitting Diodes”, Adv. Mater. 27, 2515 (2015).
2. J. Y. Lee et al. “The Design of Dual Emitting Cores for Green Thermally Activated Delayed Fluorescent Materials”, Angew. Chem. Int. Ed. 54, 5201 (2015).
3. J. Y. Lee et al. “Host Engineering for High Quantum Efficiency Blue and White Fluorescent Organic Light-Emitting Diodes”, Adv. Mater. 27, 4358 (2015).
4. J. Y. Lee et al. “Design Strategy for 25% External Quantum Efficiency in Green and Blue Thermally Activated Delayed Fluorescent Devices”, Adv. Mater. 27, 5861 (2015).
5. J. Y. Lee et al. “A Universal Host Material for High External Quantum Efficiency Close to 25% and Long Lifetime in Green Fluorescent and Phosphorescent OLEDs”, Adv. Mater 2014, 26, 4050.
6. J. Y. Lee et al. “Small Molecule Host Materials for Solution Processed Phosphorescent Organic Light-Emitting Diodes”, Adv. Mater. 2014, 26, 4218.
7. J. Y. Lee et al. “High Efficiency in a Solution-Processed Thermally Activated Delayed-Fluorescence Device Using a Delayed-Fluorescence Emitting Material with Improved Solubility”, Adv. Mater. 2014, 26, 6642.
8. J. Y. Lee et al. “Engineering of Mixed Host for High External Quantum Efficiency above 25% in Green Thermally Activated Delayed Fluorescence Device”, Adv. Funct. Mater. 2014, 24, 3970.
9. J. Y. Lee et al. “Engineering the Substitution Position of Diphenylphosphine Oxide at Carbazole for Thermal Stability and High External Quantum Efficiency Above 30% in Blue Phosphorescent Organic Light-Emitting Diodes”, Adv. Funct. Mater. 2014, 24, 4164.
10. J. Y. Lee et al. “Above 30% External Quantum Efficiency in Blue Phosphorescent Organic Light-Emitting Diodes Using Pyrido[2,3-b]indole Derivatives as Host Materials“ Adv. Mater. 2013, 25, 5450.
11. J. Y. Lee et al. “High Quantum Efficiency in Solution and Vacuum Processed Blue Phosphorescent Organic Light Emitting Diodes Using a Novel Benzofuropyridine-Based Bipolar Host Material”, Adv. Mater. 2013, 25, 596.
박사후 연구원 (Rensselaer Polytechnic Institute, 1998-1999)
삼성 SDI 책임 연구원 (1999-2005)
단국대학교 고분자공학과 교수 (2005-2015)