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B.K.Lubsandorzhiev Institute for Nuclear Research Moscow Russia - PowerPoint PPT Presentation

Sep 30, 2022 •263 likes •740 views

Extensive studies of Ultra Bright LEDs and Light Sources Based on Them B.K.Lubsandorzhiev Institute for Nuclear Research Moscow Russia University of Tuebingen Tuebingen Germany B.K. Lubsandorzhiev LIGHT-2011 1 Ringberg Castle 31 October

  1. Extensive studies of Ultra Bright LEDs and Light Sources Based on Them B.K.Lubsandorzhiev Institute for Nuclear Research Moscow Russia University of Tuebingen Tuebingen Germany B.K. Lubsandorzhiev LIGHT-2011 1 Ringberg Castle 31 October 2011

  2. LEDs are everywhere XXI century – LEDs century B.K. Lubsandorzhiev LIGHT-2011 2 Ringberg Castle 31 October 2011

  3. Giant LED bright displays B.K. Lubsandorzhiev LIGHT-2011 3 Ringberg Castle 31 October 2011

  4. Street and Highway Lights B.K. Lubsandorzhiev LIGHT-2011 4 Ringberg Castle 31 October 2011

  5. White LEDs car light Gas station in Korolyov near Moscow B.K. Lubsandorzhiev LIGHT-2011 5 Ringberg Castle 31 October 2011

  6. Bizzarre application B.K. Lubsandorzhiev LIGHT-2011 6 Ringberg Castle 31 October 2011

  7. B.K. Lubsandorzhiev LIGHT-2011 7 Ringberg Castle 31 October 2011

  8. Henry Josef Round 1881 – 1966 1907 - glow in carborund (SiC) B.K. Lubsandorzhiev LIGHT-2011 8 Ringberg Castle 31 October 2011

  9. Oleg Vladimirovitch Losev (1903-1942) “Losev’s glow” or “Losev’s effect” – 1922-1923. Green glow in SiC crystals B.K. Lubsandorzhiev LIGHT-2011 9 Ringberg Castle 31 October 2011

  10. “…. green glow of SiC crystals at currents as low as 0.4 mA ……such glowing detector can be used as fast light sources ” O.V. Losev 1923 B.K. Lubsandorzhiev LIGHT-2011 10 Ringberg Castle 31 October 2011

  11. Nick Holonyak 1962 – first LED B.K. Lubsandorzhiev LIGHT-2011 11 Ringberg Castle 31 October 2011

  12. Shuji Nakamura 1993 - Ultra Bright Blue LED B.K. Lubsandorzhiev LIGHT-2011 12 Ringberg Castle 31 October 2011

  13. Ultra Bright Blue LEDs S.Nakamura NICHIA 1993 Single quantum well InGaN/GaN structure B.K. Lubsandorzhiev LIGHT-2011 13 Ringberg Castle 31 October 2011

  14. B.K. Lubsandorzhiev LIGHT-2011 14 Ringberg Castle 31 October 2011

  15. PAO experiment Baikal neutrino experiment Experiment GERDA YAG, 3-rd harmonics  t~7 ns, 10 16 -10 17   max = 355 nm N 2 + Dye  t <1 ns , 10 13 -10 14   max = 470 nm LEDs  t ~0,5÷5 ns, 10 8 -10 12   max = 450 nm B.K. Lubsandorzhiev LIGHT-2011 15 Ringberg Castle 31 October 2011

  16. We need high light yield and fast emission kinetics LEDs - Light emission kinetics at high light yield? B.K. Lubsandorzhiev LIGHT-2011 16 Ringberg Castle 31 October 2011

  17. More than 5000 LEDs of various types from different suppliers and manufacturers have been studied Light emission kinetics varies very much! Even LEDs of one type can differ very much in their kinetics B.K. Lubsandorzhiev LIGHT-2011 17 Ringberg Castle 31 October 2011

  18. Ultra bright LEDs emission kinetics W, a.u. W, a.u. 1 1 0,1 0,1 0,01 0,01 0 5 10 15 20 25 30 35 40 45 0 10 20 30 40 50 60 70 80 90 100 110 Time, ns Time, ns Intermediate LEDs Fast LEDs(Nichia «old», G-nor, YolDal) W, a.u. W, a.u. 1 1 0,1 0,1 0,01 0,01 0 10 20 30 40 50 60 70 80 90 100 110 0 5 10 15 20 25 30 35 Time, ns Time, ns Slow LEDs Nichia «old» and «new» LEDs B.K. Lubsandorzhiev LIGHT-2011 18 Ringberg Castle 31 October 2011

  19. NSPB500S NICHIA CHEMICAL KINGBRIGHT L7133NBC slow L7113PBC «old» - 1.8 ns width «old» - 1.8 ns width «new» - 4ns width  ~10ns «old» - 4.5 ns width  ~16ns B.K. Lubsandorzhiev LIGHT-2011 19 Ringberg Castle 31 October 2011

  20. B.K. Lubsandorzhiev LIGHT-2011 20 Ringberg Castle 31 October 2011

  21. Emission spectrum at high current pulses Pulsed mode I > 2 A (1-2 ns) DC - mode B.K. Lubsandorzhiev LIGHT-2011 21 Ringberg Castle 31 October 2011

  22. NSPB500S “new” B.K. Lubsandorzhiev LIGHT-2011 22 Ringberg Castle 31 October 2011

  23. 1 - 2,2 A (1-2 ns) 2 – 20 mA (1-2 ns) B.K. Lubsandorzhiev LIGHT-2011 23 Ringberg Castle 31 October 2011

  24. G-nor GNL3014BC The fastest LED 0.6 ns width! Without tail! B.K. Lubsandorzhiev LIGHT-2011 24 Ringberg Castle 31 October 2011

  25. GNL-3014BC B.K. Lubsandorzhiev LIGHT-2011 25 Ringberg Castle 31 October 2011

  26. UV LED NSHU590 B.K. Lubsandorzhiev LIGHT-2011 26 Ringberg Castle 31 October 2011

  27. White LED GNL-5013UWC B.K. Lubsandorzhiev LIGHT-2011 27 Ringberg Castle 31 October 2011

  28. LED DRIVERS for astroparticle physics experiments B.K. Lubsandorzhiev LIGHT-2011 28 Ringberg Castle 31 October 2011

  29. • Drivers with single LEDs provide 1 ns width (FWHM) light pulses with up to 10 9 photons per pulse. • How to increase light yield keeping emission kinetics fast? • To assemble LEDs in a matrix. • Problems: Light emission kinetics of the whole matrix? • LEDs in the matrix should be selected thoroughly. • They should be identical in their emission kinetics and intensity • If several drivers - they should electronically tuned B.K. Lubsandorzhiev LIGHT-2011 29 Ringberg Castle 31 October 2011

  30. LED Matrix. One driver for a Matrix of LEDs Nearly identical (in emission kinetics, spectrum and light intensity) LEDs are selected for the matrix. The light pulses of individual LEDs coincide with each other with an accuracy of  50 ps. B.K. Lubsandorzhiev LIGHT-2011 30 Ringberg Castle 31 October 2011

  31. One dirver – LED matrix B.K. Lubsandorzhiev LIGHT-2011 31 Ringberg Castle 31 October 2011

  32. Matrix of LED drivers Each LED of the matrix has its own driver based on avalanche transistor. LEDs and their drivers are thoroughly tuned to be identical in timing and intensity. The light pulses of individual drivers coincide with each other with an accuracy of  50 ps. B.K. Lubsandorzhiev LIGHT-2011 32 Ringberg Castle 31 October 2011

  33. One LED – one driver; matrix of LED drivers B.K. Lubsandorzhiev LIGHT-2011 33 Ringberg Castle 31 October 2011

  34. LED stability and life time B.K. Lubsandorzhiev LIGHT-2011 34 Ringberg Castle 31 October 2011

  35. B.K. Lubsandorzhiev LIGHT-2011 35 Ringberg Castle 31 October 2011

  36. Light yield temperature dependence Temperature coeff. - 0.14%/C in the range of -3  50 0 C B.K. Lubsandorzhiev LIGHT-2011 36 Ringberg Castle 31 October 2011

  37. Cluster of n matrixes of ultra bright blue LEDs light pulses with  10 11 photons per pulse with 1-2 ns width B.K. Lubsandorzhiev LIGHT-2011 37 Ringberg Castle 31 October 2011

  38. High power LEDs LUMILED LXHL-NB98 10 11 -10 12 photons/pulse~6 ns width (fwhm) B.K. Lubsandorzhiev LIGHT-2011 38 Ringberg Castle 31 October 2011

  39. Cree XR7900 high power LED Royal Blue 10 12 photons /pulse ~3 ns (FWHM) B.K. Lubsandorzhiev LIGHT-2011 39 Ringberg Castle 31 October 2011

  40. TUNKA-133 1 km 2 EAS Cherenkov Array B.K. Lubsandorzhiev LIGHT-2011 40 Ringberg Castle 31 October 2011

  41. Balloon or pilotless helicopter or quadrocopter One high power LED to illuminate the whole array! B.K. Lubsandorzhiev LIGHT-2011 41 Ringberg Castle 31 October 2011

  42. Pole + reflectors B.K. Lubsandorzhiev LIGHT-2011 42 Ringberg Castle 31 October 2011

  43. B.K. Lubsandorzhiev LIGHT-2011 43 Ringberg Castle 31 October 2011

  44. GERDA B.K. Lubsandorzhiev LIGHT-2011 44 Ringberg Castle 31 October 2011

  45. 1950-60s ELECTRONICS ----- NUCLEAR ELECTRONICS 1990- …… PHOTONICS ----- NUCLEAR PHOTONICS! Photon sources (light sources in calibration systems – lasers, LEDs, scintillators) Variety of DC or pulsed sources with : 0-10 16 photons per pulse with 1ps – 10 ns width covering very wide spectrum. Photon propagation and photon producing media (scintillators, light guides and optical fibres, photon radiators etc)  abs,  scatt Photon detectors: different types and sizes (1mm – 0,5 m) Electronics: preamps, amps, drivers, power supplies etc. B.K. Lubsandorzhiev LIGHT-2011 45 Ringberg Castle 31 October 2011

  46. CONCLUSION • Ultra bright blue LEDs give excellent opportunities to design powerful, fast light sources for calibration systems of astroparticle physics experiments based on Cherenkov and scintillation techniques • Using matrixes of ultra bright blue LEDs it’s possible to have light sources with 1-2 ns width (FWHM) and intensity of up to 10 10 photons per pulse and even more, and with a cluster of matrixes - 10 11 photons per pulse. B.K. Lubsandorzhiev LIGHT-2011 46 Ringberg Castle 31 October 2011

  47. • New ultra high power blue LEDs allow to have light sources intensity of  10 12 photons per pulse with a single LED but their emission kinetics relatively slow - ~3-6 ns (FWHM). • Powerful light sources based on ultra bright blue LEDs have very high long-term stability abd very long life time. • They are powerful, fast, stable, reliable, cheap and very simple in operation. • They are in many respects very good competitor to laser systems. B.K. Lubsandorzhiev LIGHT-2011 47 Ringberg Castle 31 October 2011

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