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Electron stimulated luminescence

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Title: Electron stimulated luminescence  
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Electron stimulated luminescence

An ESL lamp.

Electron-stimulated luminescence (ESL) is [2][3][4] i.e. by a beam of electrons made to hit a fluorescent phosphor surface. This is also the method used to produce light in a cathode ray tube (CRT), but, unlike CRTs, ESL lamps do not include magnetic or electrostatic means to deflect the electron beam.[5]

A cathodoluminescent light has a transparent glass envelope coated on the inside with a light-emitting phosphor layer. Electrons emitted from a cathode strike the phosphor; the current returns through a transparent conductive coating on the envelope. The phosphor layer emits light through the transparent face of the envelope. The system has a power supply providing at least five thousand volts to the light emitting device, and the electrons transiting from cathode to anode are essentially unfocused. Additional circuits allow triac-type dimmers to control the light level.[6] Lights produced so far have a color rendering index of 85. The energy consumption can be 70% less than that of a standard incandescent light bulb. Lifetimes can be as long as 10,000 hours, i.e. up to five times longer than that of an incandescent light bulb.[7]

Unlike fluorescent lamps, which produce light through the electrical excitation of mercury vapor, ESL lamps do not use mercury.[8] The first commercially available ESL product was a reflector bulb. A standard pear-shaped light bulb is planned to be released to the European and Middle Eastern markets in 2013.

Independent product-testing suggests ESL produces better light quality than both LEDs and compact fluorescent lamps (CFLs) while maintaining full dimmability. Drawbacks include a slightly larger-than-normal base (which favors newer recessed "can" installations) and – as with CFLs – when switched on, a slight delay before illumination begins.[9]

See also

References

  1. ^ "Vu1 Corporation sees bright future for ESL light bulbs -- Engadget".  100902 engadget.com
  2. ^ "Company Claims ESLs to be the Future of Light Bulbs (w/ Video)".  100902 physorg.com
  3. ^ "Are ESL bulbs better than CFL or LED? – Crave - CNET".  100902 news.cnet.com
  4. ^ greenprophet.com - Are ESLs A Mercury-Free Replacement for CFL Lights? | Green Prophet (2012-03-12).
  5. ^ "The Promise of a Better Light Bulb?". The New York Times. 9 April 2009. 
  6. ^ http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=7834553.PN.&OS=PN/7834553&RS=PN/7834553
  7. ^ "Newest Lightbulb Tech Combines Advantages of Incandescent, Fluorescent, and LED".  100902 popsci.com
  8. ^ ""Will ESL Light Bulbs Beat LEDs?"". Forbes. 
  9. ^ http://www.diylife.com/2011/01/26/esl-light-bulbs-diy-product-review/

External links

  • Patent application with description (filed 2008-02-05)


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