Colloquium - 1 March 2023 - Prof. Sae Youn Lee, Dongguk University

Title: Development of Highly Efficient Thermally Activated Delayed Fluorescence Materials and their Application in Organic Light-Emitting Diodes

Time: 2023-03-01 13:00 - 14:00

Venue: Institute for Energy Research, 1501

Organizer: Institute for Energy Research

Abstract: Organic molecules exhibiting strong visible-light emission continue to receive considerable attention because of their promising application in organic light-emitting diodes (OLEDs). The discovery of phosphorescent materials containing heavy transition metals, such as iridium(III) and platinum(II), was a major breakthrough towards high-performance OLEDs. However, these phosphorescent materials suffer from instability in practical applications, especially for blue and white emission. The expense and rarity of precious-metal complexes also limits their cost effectiveness and long-term mass production. Realizing high-efficiency electroluminescence (EL) through a simple organic system while aiming to reduce production costs and simplify manufacturing processes is pivotal for next-generation OLED technology.

We recently explored an alternative approach to harvest excited triplet energy through up-conversion by thermal activation, giving rise to thermally activated delayed fluorescence (TADF) without using precious metal complexes. In this lecture, we introduce molecular design strategy, photophysical analysis method, and various application of TADF materials based on our previous research.