POS5-1406
Engineering Exciton Lifetime of Pt(II) complex and Templating Layer for Solution-Processed Deep-Blue Phosphor-Sensitized Fluorescent OLEDs with 36% External Quantum Efficiency
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
Raja Kumaresan (Department of Chemistry Education, Department of Chemical Materials, Institute for Plastic Information and Energy Materials Sustainable Utilization of Photovoltaic Energy Research Center (ERC), Pusan National University, Busan 46241, Republic of Korea)
Co-Author(s)
Abstract
Achieving solution-processed deep-blue organic light-emitting diodes (OLEDs) with a high color purity and efficiency that betters those of quantum dot and perovskite LEDs remains a challenge in display technology. Here, we report high-performance, solution-processed phosphor-sensitized fluorescent (PSF) OLEDs with a benchmark-setting EQEmax of 36.7%, an ultra-narrow FWHM of 19 nm, and CIEx,y coordinates of (0.130, 0.122) with the Blue Index (BI) of 291 cd A-1 CIEy-1, respectively. The newly developed blue-emitting Pt(II) complex, PtON-QBn, featuring an N atom in the alkylaryl (isoquinoline) moiety, effectively enhances spin-orbit coupling (SOC) and reduces the singlet-triplet energy gap, thereby shortening the triplet exciton lifetime to ~1 μs. This molecular design enables efficient energy transfer to the terminal fluorescent emitter, t-Bu-v-DABNA, and significantly improves EQE and suppresses efficiency roll-off. Furthermore, the introduction of a templating layer, polyvinylcarbazole (PVK), promotes horizontal dipole orientation of the emitter, further boosting optoelectronic performance. This integrated material/device strategy represents a significant advance toward the sustainable production of high-performance, non-halogenated deep-blue solution-processed OLEDs.
