Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. It is a form of luminescence. In most cases, emitted light has a longer wavelength, and therefore lower energy, than the absorbed radiation. However, when the absorbed electromagnetic radiation is intense, it is possible for one electron to absorb two photons; this two-photon absorption can lead to emission of radiation having a shorter wavelength than the absorbed radiation. The emitted radiation may also be of the same wavelength as the absorbed radiation, termed "resonance fluorescence".

The most striking examples of fluorescence occur when the absorbed radiation is in the ultraviolet region of the spectrum, and thus invisible to the human eye, and the emitted light is in the visible region.

Fluorescence has many practical applications, including mineralogy, gemology, chemical sensors (fluorescence spectroscopy), fluorescent labelling, dyes, biological detectors, and, most commonly, fluorescent lamps.

Paul Mark Oakenfold (born 30 August 1963) is an English record producer and a trance DJ.

Paul Oakenfold was set to be a chef, after having hopes of becoming part of a band. He describes his early life as a "bedroom deejay" in a podcasted interview with Vancouver's 24 Hours, stating he grew up listening to The Beatles. Later 21-year-old Oakenfold and Ian Paul moved to 254 West 54th Street. Studio 54's Steve Rubell ran the place and only allowed popular people inside. Oakenfold and Paul used fake passes to sneak into places in New York where they met Maze, Bobby Womack and Bob Marley, whom they also interviewed, claiming to be NME and Melody Maker journalists.

Oakenfold's musical career began in the late 1970s, when he started playing soul in a Covent Garden wine bar. Here, he met Trevor Fung as well as Rumours in London where he played Earth, Wind and Fire and popular British bands. In 1984, he spent several months in New York City's West Harlem. During this time hip-hop was the most popular sound in the area (see 1984 in music). He began breaking into the mainstream as he was working as an A&R man for Champion Records. At that time, he signed DJ Jazzy Jeff and the Fresh Prince, as well as Salt-n-Pepa. Oakenfold appeared on the Blue Peter BBC programme for children with a breakdancing crew. He became a promoter and British agent for the Beastie Boys and Run-D.M.C.. Since then, he appeared at The Project in Streatham playing soul and jazz music.