Tunable Charge Transfer and Photoluminescence in Quantum Dot–Graphene Hybrids

General Background: Quantum dots (QDs) and graphene have emerged as promising nanomaterials for optoelectronic and quantum applications. Specific Background: Their hybridization offers synergistic properties, yet understanding the mechanisms governing their electronic interactions remains limited. Knowledge Gap: The influence of screening effects, energy band alignment, and interfacial charge transfer dynamics in QD-graphene systems is not fully elucidated. Aims: This study aims to investigate the electronic, optical, and mechanical behaviors of QD-graphene hybrids through a combination of experimental characterization and computational modeling. Results: Using TEM, SEM, Raman, PL spectroscopy, and DFT-MD simulations, we demonstrate efficient charge transfer mechanisms—including Förster Resonance Energy Transfer (FRET) and direct charge injection—significantly modulate photoluminescence, electronic band structure, and charge carrier mobility. Screening length and temperature were shown to affect energy levels, occupation numbers, and density of states. Novelty: The study highlights the pivotal role of band alignment tuning and encapsulation strategies in enhancing the stability and functionality of QD-graphene interfaces. Implications: These findings provide a comprehensive framework for designing next-generation photodetectors, biosensors, and quantum computing devices, positioning QD-graphene hybrids as key materials for advanced nanoelectronics and photonics. Highlights: Problem: Limited understanding of charge transfer and screening effects Approach: Experimental and computational analysis of electronic and optical properties Impact: Enables advanced photonic, sensing, and quantum nanoelectronic applications Keyword: Quantum dots, Graphene, Charge transfer, Photoluminescence, Band alignment