Research

Lead-Free Metal Halides Perovskites: In recent years, the quest for environmentally friendly and sustainable materials has led to significant advancements in various fields, including optoelectronics. One noteworthy development in this domain is the exploration and implementation of lead-free metal halides. Traditionally, lead-based perovskite materials have dominated the landscape of optoelectronic devices such as solar cells and light-emitting diodes (LEDs). However, the inherent toxicity of lead has prompted researchers to seek alternatives, leading to the emergence of lead-free metal halides as promising substitutes. In this regard, we are working on lead-free lanthanide-based metal halides that exhibit excellent optical properties. Lanthanide-based, lead-free metal halides exhibit high photoluminescence quantum yields and excellent thermal stability. In particular, these metal halides demonstrate excellent scintillator properties.

Stimuli-Responsive Photon Upconversion : Photon upconversion from metal halides is a captivating area of research that explores the conversion of lower-energy photons into higher-energy ones. Metal halides, known for their unique electronic properties, provide a platform for efficient upconversion processes. In this context, the tunable bandgaps and diverse energy levels within metal halides facilitate low-energy photons' absorption and subsequent emission as higher-energy photons with the influence of stimulus. This phenomenon holds promise for applications in information encryption as well as in developing advanced lighting and imaging technologies. By harnessing the principles of photon upconversion from metal halides, we aim to contribute to the evolution of more energy-efficient and versatile optoelectronic devices. 

OD Metal Halides for LEDs: Zero-dimensional metal halides, often in the form of metal halide perovskite nanocrystals or quantum dots, are garnering attention for their potential application in white light-emitting diodes (LEDs). These nanostructures exhibit quantum confinement effects, enabling precise control over their bandgap and emission properties. By combining different metal halides with varied bandgaps, we can achieve a broad spectrum of emitted light, contributing to high-quality white light. This tunability allows for the creation of efficient and customizable white LEDs with improved color rendering and energy efficiency, making zero-dimensional metal halides a promising candidate for the advancement of next-generation lighting technologies. 

Quantum Dots: Quantum dots (QDs) have emerged as key components in the development of advanced light-emitting diodes (LEDs), offering unique optical and electrical properties. These nanoscale semiconductor particles exhibit quantum confinement effects, allowing precise control over their electronic structure and emission characteristics. In LED applications, quantum dots enable tunable emission wavelengths, leading to a broader color spectrum and improved color rendering. QDs also enhance the efficiency of LEDs by converting lower-energy photons into higher-energy ones through a process known as downconversion. This technology enhances the energy efficiency of LEDs and opens avenues for creating vibrant and high-quality displays, lighting, and other optoelectronic devices. In this regard, we are developing nontoxic quantum dots for visible and infrared emission with high PLQY and thermal stability.