What is aggregation induced emission enhancement?

The phenomenon in which organic luminophores show higher photoluminescence efficiency in the aggregated state than in solution is called aggregation-induced emission enhancement (AIEE). That is, these luminophores are said to exhibit crystallization-induced emission enhancement (CIEE).

Who discovered aggregation emissions?

Ben Zhong Tang
1. Introduction. A revolutionary class of fluorescence materials featuring emission triggered by aggregation has received great attention in sensor applications since their discovery by Ben Zhong Tang in 2001.

What is Aiegens?

AIE can be understood as a response of the fluorescence quantum yield to the surrounding environment. An AIEgen leads to non-radiative decay in dilute solution, but not in aggregates. Thus, once non-radiative decay pathways on the PES are obtained, one can understand the working mechanism of the AIEgen.

What is induced emission of radiation?

The emission of a photon by an excited atom or molecule induced by an incident photon of suitable energy. The relation between induced emission and spontaneous emission is given by the Einstein coefficients. The process of induced emission is essential for the operation of lasers and masers.

What do you mean by induced absorption?

electromagnetic radiation phenomena are referred to as induced absorption and induced emission, respectively. Also a molecule in an excited (high) energy state can spontaneously emit electromagnetic radiation, returning to some lower energy level without the presence of inducing radiation.

What are the six common pollutants?

These six pollutants are carbon monoxide, lead, nitrogen oxides, ground-level ozone, particle pollution (often referred to as particulate matter), and sulfur oxides.

How can co2 emissions be reduced?

6 Ways to Reduce Carbon Emissions

1. Reduce air travel. As of 2017, the amount of transportation-related carbon dioxide emissions eclipsed the amount of electricity generation emissions.
2. Make your driving more efficient.
3. Plant trees.
4. Switch to clean energy.
5. Eat less red meat.
6. Make your home more energy-efficient.

What is AIE Luminogens?

AIEgens are a class of nonconventional materials, which are non-emissive or weakly luminescent in the solution state but emit efficiently in the aggregate state. The study of AIE phenomenon is of academic value and has practical implications.

Why is laser important?

Laser technology is very important in the modern world because it is used in many fields, most notably measurement, where it is used to give high accuracy results in measuring small and large distances. Laser technology is also used for the purposes of generating heat in industrial cutting processes.

What causes stimulated emission?

Stimulated emission is the process by which an incoming photon of a specific frequency can interact with an excited atomic electron (or other excited molecular state), causing it to drop to a lower energy level.

What is absorption and emission?

Emission is when electrons return to energy levels. Absorption is when electrons gain energy and jump to higher energy levels. Absorption and emission of light reveals details about the atomic structure of an atom by telling us the amount of energy levels and the space between the energy levels.

What is meant by stimulated emission?