Highly Efficient Thermally Activated Delayed Fluorescence from an Excited-State Intramolecular Proton Transfer System

Masashi Mamada, Ko Inada, Takeshi Komino, William J Potscavage, Hajime Nakanotani, Chihaya Adachi

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

Thermally activated delayed fluorescence (TADF) materials have shown great potential for highly efficient organic light-emitting diodes (OLEDs). While the current molecular design of TADF materials primarily focuses on combining donor and acceptor units, we present a novel system based on the use of excited-state intramolecular proton transfer (ESIPT) to achieve efficient TADF without relying on the well-established donor-acceptor scheme. In an appropriately designed acridone-based compound with intramolecular hydrogen bonding, ESIPT leads to separation of the highest occupied and lowest unoccupied molecular orbitals, resulting in TADF emission with a photoluminescence quantum yield of nearly 60%. High external electroluminescence quantum efficiencies of up to 14% in OLEDs using this emitter prove that efficient triplet harvesting is possible with ESIPT-based TADF materials. This work will expand and accelerate the development of a wide variety of TADF materials for high performance OLEDs.

Original languageEnglish
Pages (from-to)769-777
Number of pages9
JournalJournal of Vacuum Science and Technology
Volume3
Issue number7
DOIs
Publication statusPublished - Jul 26 2017

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