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Development of highly efficient and stable organic light-emitting diodes based on delayed fluorescent materials for solid-state lighting applications

Objective

At present, OLED technology is expected to be practically applied to flat panel displays and solid state lighting sources because of its unique characteristics of low-cost processing, flexibility, and low power consumption. Till date, a large number of fluorescent and phosphorescent materials have been developed to improve the electroluminescence (EL) efficiency of OLEDs. As a result, highly durable and practically applicable OLEDs using these materials have been realized. However, the internal quantum efficiency of OLEDs based on fluorescent materials is only 25% because of the limit imposed by the electron spin-statistics under electrical excitation. In contrast, OLEDs using phosphorescent materials based on luminescence from the triplet state can achieve 100% internal quantum efficiency. Recently, an alternative realistic approach, called thermally activated delayed fluorescence (TADF), has been established to obtain ultimate 100% internal EL quantum efficiency in organic light-emitting diodes (OLEDs). But owing to rather a long transient lifetime of the triplet excited states, high efficiency roll-off and low operational stability at high current density are pertaining concerns in TADF based OLEDs. To address these challenges, the present state-of-the-art TADF-OLED technology uses a TADF molecule as an assistant dopant and a fluorescent molecule as an end emitter in a host matrix, called TADF assisted fluorescence (TAF-OLED). However, TAF-OLED approach has several inherent technical challenges associated with device physics, fabrication and cost. Through this research proposal we present a more simplified and realistic approach, called TADF hosted fluorescence (THF), to enhance the performance and operational stability by using TADF material as host material and fluorescent molecule as end emitter eliminating the need of external host matrix thus mitigate the technical issues associated with TAF-OLEDs.

Fields of science (EuroSciVoc)

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Programme(s)

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Topic(s)

Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.

Funding Scheme

Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.

MSCA-IF-EF-ST - Standard EF

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Call for proposal

Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.

(opens in new window) H2020-MSCA-IF-2016

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Coordinator

THE UNIVERSITY COURT OF THE UNIVERSITY OF ST ANDREWS
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 183 454,80
Address
NORTH STREET 66 COLLEGE GATE
KY16 9AJ ST ANDREWS
United Kingdom

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Region
Scotland Eastern Scotland Clackmannanshire and Fife
Activity type
Higher or Secondary Education Establishments
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Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

€ 183 454,80
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