DOI: https://doi.org/10.29363/nanoge.inform.2019.016
Publication date: 8th January 2019
Organic emitters exhibiting thermally activated delayed fluorescence (TADF) are rare-earth-metal-free dyes which can theoretically realize 100% internal quantum efficiency (IQE) of organic light emitting diodes (OLEDs). They were demonstrated to be promising candidates for highly efficient OLEDs [1]. TADF emitter-based light-emitting layers characterized by both high photoluminescence quantum yields and small singlet-triplet energy splitting (ΔEST) have to be developed for fabrication of efficient OLEDs. Small ΔEST (typically less than 0.1 eV) can be easily obtained in exciplex-based systems. Since electron and hole are positioned on two different molecules, exciplex-based emitters are characterized by small exchange energy and efficient TADF [1]. If exciplexes are formed between layers of donating and accepting materials in OLED structures, energy barrier free interface for charges is obtained. This results in low operating voltages of OLEDs and enhanced power efficiencies (PE). Aiming to obtain both high IEQ and PE of OLEDs, exciplex-based OLED approaches demonstrated promising results [1].
Recently developed exciplex-forming donor-acceptor solid mixtures will be presented as either emitters or hosts with TADF properties for highly efficient OLEDs including interface exciplex-based OLEDs. For instance, exciplex-forming system consisting of 3,6-di(9-carbazolyl)-9-(2-ethylhexyl)carbazole as donor and 2,4,6-tris[3-(diphenylphosphinyl)phenyl]-1,3,5-triazine as acceptor allowed to achieve very high value of of maximum external quantum efficiency (18%) for OLEDs based on interface exciplex emitter [2]. In addition, new approach for the development of the color-tunable OLEDs with the minimal number of the functional layers will be presented [3]. Guest-host free OLEDs combining emission from both excitons and exciplexes based on aggregation-induced emission enhancement of carbazole and tetraphenylethylene derivatives will be reported [4]. Extremely efficient warm-white OLEDs exploiting interface exciplex emission with harmless for the human eyes electroluminescence spectra will be presented [5]. Utilization of interface exciplex-host will be demonstrated for optimization and enhancement of performance of non-doped OLEDs based on new emitters showing aggregation induced emission enhancement [6].
This research was funded by the European Regional Development Fund according to the supported activity ‘Research Projects Implemented by World-class Researcher Groups’ under Measure No. 01.2.2-LMT-K-718.
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