Reversible, Full-Color Luminescence by Post-treatment of Perovskite Nanocrystals

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1. Luminescence

Luminescence는 원자, 분자, 고분자 및 결정체에 외부에너지를 가하여 줌으로써 그 물질 내의 고유한 전자 상태 간의 transition에 의해 흡수된 에너지를 빛 형태로 방출하면서 원래의 평형 상태로 되돌아가는 일련의 물리적 현상이다. 형광(Fluorescence)은 전자가 들뜬 단일항 상태에서 낮은 에너지 단일항 상태로 이완될 때 발생하는 빛의 방출이다.
2. Perovskite Nanocrystals

Perovskite는 일반식으로 ABX3라고 표현되며, 여기에서 A와 B는 크기가 다른 양이온이고, X는 두 양이온에 결합해 있는 음이온이다. Perovskite nanocrystals의 형광을 관찰하고, 할로겐 원소 변화에 따른 luminescence of perovskite nanocrystals의 색을 확인한다.

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1. Luminescence

Luminescence is a fascinating phenomenon that has captured the attention of scientists and researchers for centuries. It refers to the emission of light from a material without the material being heated to high temperatures. This process occurs when electrons in the material are excited to higher energy levels and then return to their ground state, releasing energy in the form of photons. Luminescence can be observed in a wide range of materials, including organic compounds, inorganic solids, and even living organisms like fireflies and bioluminescent marine creatures. Understanding the mechanisms behind luminescence has led to numerous applications in fields such as lighting, displays, and medical imaging. Continued research in this area has the potential to unlock new and innovative ways to harness this unique property of materials, leading to advancements in technology and our understanding of the natural world.
2. Perovskite Nanocrystals

Perovskite nanocrystals are a rapidly emerging class of materials that have garnered significant attention in the scientific community due to their unique and promising properties. These nanocrystals, which are typically composed of a combination of organic and inorganic elements, exhibit exceptional optoelectronic characteristics, including high light absorption, efficient charge transport, and tunable emission wavelengths. The ability to precisely control the size and composition of perovskite nanocrystals has led to their exploration in a wide range of applications, such as solar cells, light-emitting diodes (LEDs), photodetectors, and even quantum computing. One of the key advantages of perovskite nanocrystals is their potential for low-cost and scalable manufacturing, making them an attractive alternative to traditional semiconductor materials. As research in this field continues to advance, the development of perovskite nanocrystals could pave the way for transformative breakthroughs in energy, electronics, and beyond, with far-reaching implications for our technological future.