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  1. Making light Hans U. Güdel Department für Chemie und Biochemie Seminar Fribourg, 13.10.2009

  2. Making light

  3. Area illuminators

  4. OLED Technology

  5. Making light • Light • White and coloured light • Photoluminescence, phosphors • Spectrum • Light emitting diodes (LED) • Outlook • Light

  6. Making light • Light

  7. Fiat Lux First Book Moses (Genesis), Chapter 1 1 in principio creavit Deus caelum et terram 2 terra autem erat inanis et vacua et tenebrae super faciem abyssi et spiritus Dei ferebatur super aquas 3 dixitque Deus fiat lux et facta est lux 4 et vidit Deus lucem quod esset bona et divisit lucem ac tenebras

  8. Black body radiation Temperature: Colour: 2500°C 5000°C 7500°C

  9. Black body radiation Temperature: Colour: 5000°C

  10. Human eye photoreceptors

  11. Incandescent lamp 2500°C

  12. Dispersion of white light

  13. Making light: Additive mixing

  14. Chromaticity Diagram

  15. Photoluminescence

  16. Kasha's Rule

  17. Light emitting semiconductor Light emission Conduction band – Bandgap + Valence band

  18. Photoluminescence of CdSe Nanoparticels

  19. Fluorescent lamp

  20. Luminescent phosphors

  21. Lamp and display phophors BaMgAl10O17: Eu2+ (Ce,Gd)MgB5O10: Tb3+ Y2O3: Eu3+ Judith Grimm

  22. The Lanthanides

  23. Coloured light

  24. LED based technology

  25. Light emitting diodes (LED) Conduction band – Electroluminescence Bandgap + Valence band

  26. LED Materials Inorganic Organic (OLED) III – V Semiconductors Polymeric luminescent molecules with conjugated electron systems Al, Ga, In N, P, As, Sb AlGaAs AlGaInP n AlGaP Polyphenylenvinylene GaN

  27. Light emitting polymer

  28. Mirco Colombo citations, 3 papers

  29. Diode spectra

  30. White diode lamp Diode Y3Al2(AlO4)3: Ce3+ – +

  31. Chromaticity Diagram

  32. Energy efficiency of light sources

  33. Technology steps Electronics Micro electronics Tube digital, solid analog Light sources Diode Solid Tube

  34. Area illuminators

  35. Acknowledgment Gabriela Frei