DataVXAdvanced Optical MaterialsPaper
journal article·2024-01Open access

Indication of Intramolecular Triplet–Triplet Annihilation Upconversion in Organic Light‐Emitting Diodes

Shoma Sasaki, Kenichi Goushi, Masashi Mamada, Shiori Miyazaki, Kiyoshi Miyata, Ken Onda, Chihaya Adachi

Advanced Optical Materials· Volume 12· Issue 3
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Source abstract

Abstract

Abstract It is well known that triplet–triplet annihilation upconversion (TTU) can enhance electroluminescence (EL) efficiency by converting two low‐energy triplet excitons into one high‐energy singlet exciton. However, conventional intermolecular TTU requires high doping concentration to activate, limiting device architecture. Here, six dimer molecules comprised of two anthracene units connected by a spacer unit are investigated, which have a possibility of the intramolecular TTU process. As a result, two dimer molecules show high TTU efficiencies close to the theoretical maximum even in dispersed, diluted conditions. By comparing these molecular conformations, a correlation is found between the dimer structures of two anthracene units and the TTU activity in the diluted condition, i.e., the 3D molecular structure with the exciton utilizing efficiency.
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Research context

OpenAlex topics: Organic Light-Emitting Diodes Research · Luminescence and Fluorescent Materials · Organic Electronics and Photovoltaics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Applied Chemistry Center of Organic Photonics and Electronics Research (OPERA) Kyushu University 744 Motooka, Nishi Fukuoka 819‐0395 Japan

International Institute for Carbon Neutral Energy Research (I^{2}CNER) Kyushu University 744 Motooka, Nishi Fukuoka 819‐0395 Japan

Department of Chemistry Graduate School of Science Kyoto University Kitashirakawa, Oiwakecho, Sakyo Kyoto 606‐8502 Japan

Department of Chemistry Graduate School of Science Kyushu University 744 Motooka, Nishi Fukuoka 819‐0395 Japan

Funding

Japan Society for the Promotion of Science · Japan Science and Technology Agency · Sumitomo Foundation

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