Luminol and haemoglobin, an example of chemiluminescence
UV-photoluminescence in microbiological diagnostics

Luminescence is the "spontaneous emission of radiation from an electronically excited species (or from a vibrationally excited species) not in thermal equilibrium with its environment", according to the IUPAC definition.[1] A luminescent object is emitting "cold light", in contrast to "incandescence", where an object only emits light after heating.[2] Generally, the emission of light is due to the movement of electrons between different energy levels within an atom after excitation by external factors. However, the exact mechanism of light emission in "vibrationally excited species" is unknown, as seen in sonoluminescence.

The dials, hands, scales, and signs of aviation and navigational instruments and markings are often coated with luminescent materials in a process known as "luminising".[3]



Luminescence occurs in some minerals when they are exposed to low-powered sources of ultraviolet or infrared electromagnetic radiation (for example, portable UV lamps) at atmospheric pressure and atmospheric temperatures. This property of these minerals can be used during the process of mineral identification at rock outcrops in the field or in the laboratory.


The term "luminescence" was first introduced in 1888.[9]

See also


  1. ^ Chemistry (IUPAC), The International Union of Pure and Applied. "IUPAC - luminescence (L03641)". Retrieved 2023-12-03.
  2. ^ a b c Valeur, Bernard; Berberan-Santos, Mário N. (2011-06-01). "A Brief History of Fluorescence and Phosphorescence before the Emergence of Quantum Theory". Journal of Chemical Education. 88 (6): 731–738. Bibcode:2011JChEd..88..731V. doi:10.1021/ed100182h. ISSN 0021-9584.
  3. ^ Cooper, John R.; Randle, Keith; Sokhi, Ranjeet S. (2003). Radioactive Releases in the Environment: Impact and Assessment. Wiley. p. 192. ISBN 978-0-471-89924-2.
  4. ^ Piezoluminescence phenomenon N. A. Atari Physics Letters A Volume 90, Issues 1-2, 21 June 1982, Pages 93-96 doi:10.1016/0375-9601(82)90060-3
  5. ^ Meetei, Sanoujam Dhiren. "Synthesis, Characterization and Photoluminescence of ZrO2:Eu3+ Nanocrystals" (PDF). Retrieved 18 December 2014.
  6. ^ Sidran, Miriam (1968). "The Luminescence of the Moon". In Kopal, Zdeněk (ed.). Advances in Astronomy and Astrophysics (Volume 6). Academic Press. p. 301.
  7. ^ Jorio, Ado; Dresselhaus, Gene; Dresselhaus, Mildred S. (2007-12-18). Carbon Nanotubes: Advanced Topics in the Synthesis, Structure, Properties and Applications. Springer Science & Business Media. ISBN 978-3-540-72865-8.
  8. ^ "Light-emitting particles illuminate understanding of cellular malfunctions - News & Media @ UOW". Archived from the original on 2018-06-12. Retrieved 2018-06-11.
  9. ^ "Über Fluorescenz und Phosphorescenz, I. Abhandlung" (On fluorescence and phosphorescence, first paper), Annalen der Physik und Chemie, 34: 446-463. From page 447: "Ich möchte für diese zweite Art der Lichterregung, für die uns eine einheitliche Benennung fehlt, den Namen Luminescenz vorschlagen, und Körper, die in dieser Weise leuchten, luminescirende nennen." [For this second type of light excitation, for which we lack a consistent name, I would like to suggest the name of "luminescence", and call "luminescing" [any] bodies that glow in this way.]