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 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) 15 Cathode ray - light sources .