Cathode ray - light sources

Nina Hanssen Content

 Cathodoluminesence

 History

 Cathode Ray Tube (CRT)

 Puluj lamp

 New development in lighting

2 Cathode ray - light sources Cathodoluminescence

 Promotion of an electron from the valence band to the conduction band  Recombination of electrons and holes  Photons  Phonons

 Scanning electron microscopy

3 Cathode ray - light sources History of CRT

 1897 Ferdinand Braun invented his Braun tube

 1907 Boris Rosing: Display of a simple Video

 1934 first commercial electronic television sets made by Telefunken in Germany

4 Cathode ray - light sources TV displays

 Basic components of a monitor CRT

5 Cathode ray - light sources Shadow mask and phosphor matrix

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6 Cathode ray - light sources Phosphors in a TV panel

7 Cathode ray - light sources Emission spectra of three phosphors

8 Cathode ray - light sources Future aspects

 Will disappear in the TV market  Weight  Size  High power consumption

 Interesting for the lighting industry?

9 Cathode ray - light sources Puluj lamp

 Ivan Puluj (1845-1918)  Lamp developed in 1881  Emission of x-rays  Worked together with Röntgen

10 Cathode ray - light sources Used Phosphors in these kinds of lamps

 Thin powder film on a glimmer plate

 Blue : CaWO4 + CuWO4

 Green: CaS + MnSO4

 Pink: SrSO4 + CuSO4

 Red: MgSO4 + MnSO4

 Yellow: MgSO4 + CdSO4

11 Cathode ray - light sources New development Electron stimulated luminescence (ESL)

 2004 aim to build a new light bulb  2007 invest in manufacturing capability  2010 UL certification  Today you can buy it in the USA

12 Cathode ray - light sources Build up of the bulb

 Electron spray reaches a phosphor layer

13 Cathode ray - light sources Data for the bulbs

 Lumens = 500  115V AC input power: 19.5W  Color Temperature = 3200K  Color Rendering Index > 90+

 Fully linear dimming with ordinary household Triac-based dimmers  Approximately 11,000 hour life

14 Cathode ray - light sources References

 Janglin Chen, Wayne Cranton, Mark Fihn (eds.), Handbook of Visual Display Technology, Springer-Verlag Berlin Heidelberg 2012  http://en.wikipedia.org/wiki/Cathode_ray_tube (15.05.2012)  http://green.blogs.nytimes.com/tag/electron-stimulated-luminescence/ (15.05.2012)  http://en.wikipedia.org/wiki/Cathodoluminescence (15.05.2012)  http://display-magazin.net/thema/displays/geschichte-der-braunschen-roehre (15.05.2012)  http://www.crtsite.com/page5.html (15.05.2012)  http://www.vu1corporation.com/ (13.05.2012)  http://www.squidoo.com/ledbacklittv (19.05.2012)  http://blogs.scientificamerican.com/solar-at-home/2011/03/21/a-better-kind- of-lightbulb/ (19.05.2012)

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