H2020Индивидуална стипендия2017–2019

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

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2017-06-01 → 2019-11-02
Финансиране от ЕС: 183 455 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Органичните светодиоди (OLED), базирани на материали с забавена флуоресценция, се изследват за създаване на по-стабилно и ефективно осветление и екрани. Това помага за намаляване на разхода на електроенергия и е по-щадящо околната среда от традиционните крушки и LCD дисплеи.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

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

At present, about 20% of the world’s electricity consumption is devoted to display and lighting in one form or another. Existing display technology (particularly mobile display) rely on inefficient liquid crystal display (LCD) technology for outdoor usage while most luminaires rely on very energy inefficient technologies such as incandescent and fluorescent light bulbs. Organic light-emitting diode (OLED) based display technology and solid-state lighting (SSL) devices hold great promise as an alternative to conventional LCD and luminaires with impressive economic and environmental savings . OLEDs are an emerging display and SSL technology that offers several advantages over commonly used LCD and luminaires. These advantages include: self-illumination, low power consumption, vibration resistance, and most importantly, environmental friendliness. OLEDs also provide enticing manufacturing design possibilities such as a wide range substrate choice, including flexible devices. The development of cheap and energy-efficient OLED lighting devices would be a transformative World-wide advance. Through this project we proposed to develop such OLED device based on thermally activated delayed fluorescent (TADF) materials that are efficient, stable and inexpensive. The overall object of this research proposal was to devise the solutions for these two pertinent challenges in TADF-OLED technology: minimizing efficiency roll-off and improving device operational stability.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

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.

Оригинален текст от CORDIS (на английски).

Участници

THE UNIVERSITY COURT OF THE UNIVERSITY OF ST ANDREWS · ST ANDREWSКоординаторОбединеното кралство