Seminar of Pr Chihaya Adachi

Pr Chihaya Adachi is Professor at the Center for Organic Photonics and Electronics Research (OPERA, Kyushu University, Japan)

Abstract

In the last 10 years, there have been a wide variety of studies on thermally activated delayed fluorescence (TADF)-OLEDs focusing on the unlimited possibilities of molecular design [1]. Further, hyperfluorescence (HF)-OLEDs have been developed since they can realize the compatibility of high efficiency and narrow spectral width which is ideal for display applications. The advanced HF-OLEDs realized high light-emitting performance by engineering host, TADF, and terminal emitter (TE) molecules. We mention the comprehensive design principle for the materials and device architectures used in HP-OLEDs by focusing on fast T-S upconversion, negative gap, efficient FRET, GSP, and carrier trapping aimed at high-performance EL [2-5]. In addition, we underscore the crucial role of CT characteristics in organic optoelectronic devices, shedding light on novel devices such as thermoelectrics [6].

References:
[1] T. Uoyama, et al., Nature, 492, 234 (2012)
[2] C.-Y. Chan et al., Nat. Photon., 15, 203 (2021)
[3] Y.-T. Lee et al., Adv. Elect. Mater., 7, 2001090 (2021)
[4] M. Tanaka et al., ACS Appl. Mater. & Inter., 12, 50668 (2020)
[5] Y.-T. Lee et al., Nat. Commun., 15, 3659 (2024)
[6] S. Kondo, et al., Nat. Commun., (in press).