Research Projects

Circularly polarized luminescence (CPL) is crucial for photonic applications like OLEDs, data encryption, optical quantum technologies, and quantum computing. Photons' circular polarization is similar to electrons, causing a phase shift between the electric and magnetic field vectors. When electron density changes, chiral moieties provide rotatory strength. The luminophore's degree of charge transfer per photon (CPL) is represented by the glum, with the maximum value being ±2. The challenging part is to acquire high glum values, which often results in requiring a small radiative rate constant (kr) and oscillator strength, which affect the quantum yield. Thus, high kr is crucial for efficient triplet exciton CPL in electrically driven devices. Also, charge transfer emitters often display wider emission spectra and stability issues due to their delocalized nature and molecular structure. Different classes of luminophores have been studied over the years to clarify synthetic design criteria and achieve high CPL values, with most chiral organic TADF compounds remaining at a dissymmetry of less than 3×10-3. A low-energy circularly polarised multi-resonance (CP-MR) type TADF emitter called DA-DBNapA was designed using a diboron-based framework and chiral diamines. It includes nitrogen atoms for efficient noncovalent interaction locking and chirality, resulting in superior dissymmetry factors and a considerable rotatory strength of electronic transitions. FT-IR, NMR (1H and 13C), HRMS, and analytical (CHNS) methods will be used to characterize the synthesized molecules. Single crystal X-ray diffraction studies will be used to further confirm structural features, along with circularly polarized luminescence (CPL) spectra will be recorded on a CPL spectrophotometer equipped with a Xenon lamp. UV-visible, fluorescence, thermo-gravimetric analysis (TGA), and cyclic voltammetric techniques will be used to measure the charge transfer (ICT) process, thermal stability, and redox behavior of the materials. Time-resolved spectroscopic analysis and quantum mechanical model investigations will be used to comprehend the radiative decay processes. To achieve higher efficiencies, appropriate host materials will be chosen when building electroluminescent devices. The project aims to resolve short lifespans, rapid efficiency roll-off, and low electrically polarized luminescence in electroluminescent devices.