Akademik Veri Yönetim Sistemi
ÇIRPAN A. (Yürütücü), KARGIN B. E., BARAN E., KESERCİ A. Z., KAZANCIOĞLU B., ŞAHİNASLAN S.
Yükseköğretim Kurumları Destekli Proje, BAP Diğer, 2023 - 2025
With the advancement of lighting technologies, the development of organic light-emitting diodes (OLEDs) has emerged as a significant research focus in materials science and optoelectronics. Optimizing OLED materials contributes to improved energy efficiency and the development of highperformance display and lighting systems. To date, three generations of OLED materials have been developed: fluorescent, phosphorescent, and thermally activated delayed fluorescence (TADF) OLEDs. Fluorescent OLEDs have exhibited limited commercial viability due to low quantum efficiencies and high thermal losses. To address these challenges, phosphorescent OLEDs incorporating heavy metal complexes were developed; however, the mining and purification of these metals are costly and pose environmental risks. Consequently, TADF-based OLEDs, which are metal-free, cost-effective, and highly efficient, have gained attention as promising alternatives. TADF materials can theoretically achieve 100% internal quantum efficiency by utilizing both singlet and triplet excitons through the reverse intersystem crossing (RISC) mechanism. Supported by the Scientific Research Projects Coordination Unit of Middle East Technical University (METU BAP), this project aimed to synthesize novel, high-efficiency TADF OLED materials, characterize them spectroscopically and electrochemically, and evaluate their device performance. Within the scope of the study, the effects of different heteroatoms—oxygen, sulfur, and selenium—on TADF efficiency were systematically investigated. Boron and triazine units were employed as electron acceptors, while phenoxazine, phenothiazine, and phenoselenazine were used as electron donors. Furthermore, the role of thiophene π-bridges in tuning the electronic structure and device performance was extensively examined. This work aims to contribute to the rational design and development of next-generation high-efficiency OLED materials based on TADF mechanisms.