Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
Publication date: 18th July 2023
Organic light-emitting diodes (OLEDs) technology has outperformed other technologies in recent decades [1]. OLEDs are the ultimate technology for display and are stepping rapidly into lighting. At present, there is an intensive need for high-performance deep-blue emitters in full-color display and solid-state lighting [2]. However, as the emission peaks shift towards the deep-blue region, the nonradiative transition rate of metal d-orbitals tends to increase, making it difficult to achieve a high efficiency altogether [3]. To solve the problem, small-molecules fluorescent materials have re-gained attention due to their high color purity and low cost [4]. The synthesis of bicarbazole-based host materials was carried out by the three-step synthetic route and objective materials shown in graphic. Herein, we introduce a series of donor-acceptor-donor (D-A-D) twisted derivatives based on carbazole-benzophenone moieties. We have designed three-step synthesized carbazole-benzophenone-based twisted D-A-D derivatives, namely 6, 7, 8, and 9, as bi-functional materials. These materials possess high decomposition temperatures (>360°C) and glass transition temperature (~125°C), high photoluminescence quantum yield (>60%), wide bandgap (>3.2 eV), and a short decay time (ns). Owing to their properties, the materials were utilized as blue emitters and host materials for deep-blue and green OLEDs, respectively. In terms of the blue OLEDs, the emitter 7-based device has outperformed others by showing a high maximum EQE of 4.0%, close to the theoretical limit of fluorescent materials, for a deep-blue emission (CIEy= 0.09). Whilst the same material also displayed a maximum power efficacy of 45 lm/W as a host material doped with a phosphorescent emitter (Ir(ppy)3). Furthermore, the materials were also utilized as a host with TADF green emitter (4CzIPN). Due to the high quantum yield of 69%, the host 9-based green device has displayed a maximum EQE of almost 11%. Therefore, the bi-functional materials are easily synthesized, economical, possess excellent characteristics and are expected to be useful in a variety of cost-effective and high-performance OLED applications.
We acknowledge support from the Research Council of Lithuania (grant No. S-MIP-22-84).
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