What do u mean by luminescence?

What do u mean by luminescence?

luminescence, emission of light by certain materials when they are relatively cool. It is in contrast to light emitted from incandescent bodies, such as burning wood or coal, molten iron, and wire heated by an electric current.

What is luminescence with example?

Chemoluminescence – This process creates light through a chemical reaction. LEDs, or light-emitting diodes, are found in flat panel televisions and computer monitors. Fluorescence – Fluorescent materials absorb light and then they glow for a certain time.

What is luminescent light?

Luminescence is the emission of light produced by methods other than heat. Luminescence is caused by the movement of electrons into different energetic states. There are many different types of luminescence including bioluminescence, chemiluminescence, phosphorescence, and fluorescence.

What is luminescence simple?

Luminescence is emission in the optical range of the visible, ultraviolet, or infrared light, which is an excess over the thermal radiation emitted by the substance at a given temperature, and continues after absorbing the excitation energy for a time that is significantly longer than the period of the light waves.

What is a luminescent person?

adjective. 2. The definition of luminescent is something or someone that glows or emits light.

What is luminescent light for kids?

Luminescence is light emitted by a substance not caused by heat. In contrast, incandescence is light emitted by a substance as a result of heating. Luminescence can be caused by chemical reactions, electrical energy, subatomic motions, or piezoelectricity (stress on a crystal).

Can a person be luminescent?

According to a study conducted in 2009 by Japanese researchers, human bioluminescence in visible light exists – it’s just too dim for our weak eyes to pick up on. “The human body literally glimmers,” the team from the Tohoku Institute of Technology wrote in their study published in PLOS One.

How do you use luminescent in a sentence?

Examples of ‘luminescent’ in a sentence luminescent

  1. His eyes glowed bright purple with the light of luminescent bacteria colonies implanted in his irises.
  2. Yawning, he lifted his arm and squinted at the luminescent numbers of his watch.

What is electron luminescence?

Electroluminescence (EL) is a process by which photons are generated when the excess electron–hole pairs are created by an electric current caused by an externally applied bias.

What is a synonym for luminescent?

In this page you can discover 19 synonyms, antonyms, idiomatic expressions, and related words for luminescent, like: gleaming, glowing, luminous, luminescent, bright, fluorescent, glimmering, glistening, radiant, shining and twinkling.

Is the moon luminescent?

Strictly speaking, although the Moon appears to give off light, it’s not actually luminous because it’s simply reflecting light from the Sun like a giant mirror made of rock. Luminescent things, by contrast, make light when their atoms become excited in a process that needs little or no heat to make it happen.

What is the mechanism of luminescence?

The luminescent process consists of the excitation of an electron to the metastable level, the activated release of the electron to the emitting level, and a forbidden transition between the emitting and the ground state. With high excitation energy, the metastable state is bypassed.

What is the meaning of the term luminescence?

Luminescence. For other uses, see Luminescence (disambiguation). Luminescence is spontaneous emission of light by a substance not resulting from heat; it is thus a form of cold-body radiation. It can be caused by chemical reactions, electrical energy, subatomic motions or stress on a crystal.

What are three sources of light that create luminescence?

— Geoff Nudelman, WSJ, 22 Apr. 2021 The show’s one flaw, at least for me, was Celeste’s efforts to find and combine three different sources of light — phosphorescence, incandescence and iridescence — in order to create luminescence, which isn’t really how that works.

Where was Luminescence used to date ancient tools?

A technique called luminescence dating was used to date the ancient tools which were found in a rock shelter at the bottom of a cliff, on the edge of a sandy savannah plain some 300 km (186 miles) east of Darwin.

When was the last time luminescence was tested?

— Ann Gibbons, Science | AAAS, 16 June 2021 Optically stimulated luminescence testing showed the crystals were last exposed to sunlight about 1,000 years ago. — David Kindy, Smithsonian Magazine, 14 May 2021