Research Projects

OLEDs play a vital role in our daily lives, shaping the way we communicate, entertain, and interact with the world around us. In recent years, there has been significant interest in utilizing boron-based molecules as highly efficient TADF emitters in photoelectric devices. Replacing a pair of carbon atoms in polyaromatic hydrocarbons with an isoelectronic BN unit is one of the powerful strategies to expand the structural diversity of organic conjugated materials. This modification introduces electron-rich nitrogen and electron-deficient boron centers into the PAHs, preserving their aromaticity and fundamental structural characteristics while inducing significant changes in the optical and electronic properties due to the presence of a dipole within the molecule. The inclusion of the B-N unit not only alters the molecular frontier orbitals but also influences the intermolecular interactions, resulting in the remarkable optical performance of the doped PAHs. Cyclic amino boranes exhibit good thermal and chemical stability, making them suitable for practical device applications. The energy levels of cyclic amino boranes can be tailored through molecular design and modification, allowing for precise control over the emission characteristics. This tunability is beneficial for achieving the desired color and efficiency in devices. Our design strategy involves the use of rigid donors and acceptors that have been modified with a blocking group. This modification serves to inhibit intermolecular interactions and enhance the rate of Reverse Intersystem Crossing (RISC), thereby minimizing efficiency loss. Interactions between molecules often lead to quenching processes like triplet-triplet annihilation, which can be circumvented by introducing substantial steric hindrance around the macrocycle. By adopting this design strategy, utilizing rigid cyclic aminoboranes and a blocking group, we can effectively stabilize the triplet exciton and safeguard the triplet luminogens against external disturbances. This, in turn, significantly contributes to the overall efficiency and performance of OLEDs. Further, a strong understanding of the relationship between TADF property and the solid-state arrangement of aminoboranes needs to be developed to aid in their molecular design and crystal engineering to improve device performance, for example, to achieve higher emissive properties. To address these problems, using our expertise in boron chemistry, we plan to develop cyclic aminoboranes systems. Design, development, and appraisal of novel luminophores will be carried out. Synthesized boron-based luminophores will be screened for optoelectronic materials development. Chemical knowledge acquired in this project will be utilized for a better understanding of the functional properties of cyclic aminoboranes and may lead to the development of next-generation smart materials.