Skip to main content
SpringerLink
Log in

Tunable natural light realized by phosphor-innovation light-emitting-diode technology

Veränderbares natürliches Licht realisiert mit Phosphor-Innovation Licht-Emittierender-Dioden-Technologie

  • Originalarbeiten
  • Published:
e & i Elektrotechnik und Informationstechnik Aims and scope Submit manuscript

Abstract

The nature and quality of artificial lighting are becoming more and more recognized and debated issues concerning their impact on comfort, well-being and even human’s health (chronobiology). Therefore, the target must be to emulate natural (sun) light for indoor illumination. In this paper parameters which are responsible for the nature and quality of light sources are elaborated. Leading edge high quality light sources, realized by light emitting diodes (LEDs) for emulating natural light, are presented.

The junction temperature of electroluminescence devices is a key parameter which influences emission wavelength, light output (power efficiency), light degradation and lifetime of the LEDs. We present experimental data and a model which allows one to derive the junction temperature of LEDs under operation.

Zusammenfassung

Die Natur und die Qualität künstlicher Lichtquellen und deren Auswirkungen auf Komfort, Wohlbefinden und Gesundheit werden immer stärker wahrgenommen und diskutiert (Chronobiologie). Daraus folgt nahezu zwingend die Forderung, natürliches (Sonnen-)Licht im Bereich der Innenraumbeleuchtung nachzubilden. In dieser Arbeit werden wesentliche Parameter, welche die Natur und die Qualität von Lichtquellen bestimmen, behandelt. Präsentiert werden technologisch führende und hoch qualitative Lichtquellen zur Erzeugung von „natürlichem“ Licht unter Verwendung von Licht emittierenden Dioden (LEDs).

Die Temperatur der Grenzschicht ist ein Schlüsselparameter, der die Emissionswellenlänge, die Lichtausbeute (Effizienz), die Lichtdegradation und letztlich die Lebensdauer von LEDs bestimmt. Wir präsentieren Messergebnisse zur Grenzschichttemperatur und ein Modell, welches erlaubt, die Temperatur der Grenzschicht der LED im Betrieb zu bestimmen.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1.
Fig. 2.
Fig. 3.
Fig. 4.
Fig. 5.
Fig. 6.
Fig. 7.
Fig. 8.

Similar content being viewed by others

References

  • Barkmann, C., Wessolowski, N., Schulte-Markwort, M. (2012): Applicability and efficacy of variable light in schools. Physiol. Behav., 105(3), 621–627.

    Article  Google Scholar 

  • Bieske, K., Gall, D., Vandahl, C., Dierbach, O. (2006): Influence of artificial daylight on gerontopsychiatric care of elderly people. In CIE 2cd expert symposium on light and health, CIEx 031:2006, 7.-8.9. Ottawa.

    Google Scholar 

  • Brainard, G. C., Hanifin, J. P., Greeson, J. M., Byrne, B., Glickman, G., Gerner, E., Rollag, M. D. (2001): Action spectrum for melatonin regulation in humans: evidence for a novel circadian photoreceptor. J. Neurosci., 21(16), 6405–6412.

    Google Scholar 

  • Braunstein, R. (1955): Radiative transitions in semiconductors. Phys. Rev., 99(6), 1892–1893.

    Article  MathSciNet  Google Scholar 

  • Cajochen, C. (2007): Alerting effects of light. Sleep Med. Rev., 11(6), 453–464.

    Article  Google Scholar 

  • Cajochen, C., Munch, M., Kobialka, S., Krauchi, K., Steiner, R., Oelhafen, P., Orgul, S., Wirz-Justice, A. (2005): High sensitivity of human melatonin, alertness, thermoregulation, and heart rate to short wavelength light. J. Clin. Endocrinol. Metab., 90(3), 1311–1316.

    Article  Google Scholar 

  • Cameron, J. R., Skofronick, J. G. (1978): Medical physics (pp. 337–384). New York: Wiley.

    Google Scholar 

  • Figueiro, M. G., Rea, M. S. (2010): The effects of red and blue lights on circadian variations in cortisol, alpha amylase, and melatonin. Int. J. Endocrinol., 2010, 829351.

    Google Scholar 

  • Figueiro, M. G., Appleman, K., Bullough, J. D., Rea, M. S. (2006): A discussion of recommended standards for lighting in the newborn intensive care unit. J. Perinatol., 26, 19–26.

    Article  Google Scholar 

  • GE Lighting (2003). CMH single ended G8.5 product information for OEMs. General Electric Company. Ver. 1.0.

  • Haitz, R., Tsao, J. Y. (2011): Solid-state lighting: ‘The case’ 10 years after and future prospects. Phys. Status Solidi, a Appl. Mater. Sci., 208(1), 17–29.

    Article  Google Scholar 

  • Hattar, S., Liao, H. W., Takao, M., Berson, D. M., Yau, K. W. (2002): Melanopsin-containing retinal. ganglion cells: architecture, projections, and intrinsic photosensitivity. Science, 295(5557), 1065–1070.

    Article  Google Scholar 

  • Hofstra, W. A., Weerd, A. W. D. (2008): How to assess circadian rhythm in humans: a review of literature. Epilepsy Behav., 13(3), 438–444.

    Article  Google Scholar 

  • Holonyak, N., Bevacqua, S. F. (1962): Coherent (visible) light emission from Ga(As1−x P x ) junctions. Appl. Phys. Lett., 1(4), 82–83.

    Article  Google Scholar 

  • Lockley, S. W., Brainard, G. C., Czeisler, C. A. (2003): High sensitivity of the human circadian melatonin rhythm to resetting by short wavelength light. J. Clin. Endocrinol. Metab., 88(9), 4502–4505.

    Article  Google Scholar 

  • Mills, P. R., Tomkins, S. C., Schlangen, L. J. (2007): The effect of high correlated colour temperature office lighting on employee wellbeing and work performance. J. Circadian Rhythms, 5(2).

  • Morita, T., Tokura, H. (1996): Effects of lights of different color temperature on the nocturnal changes in core temperature and melatonin in humans. Appl. Hum. Sci., 15(5), 243–246.

    Article  Google Scholar 

  • Philips (2012): Lamp Description MasterColor® CDM ED28 standard.

  • Phipps-Nelson, J., Redman, J. R., Dijk, D. J., Rajaratnam, S. M. W. (2003): Daytime exposure to bright light, as compared to dim light, decreases sleepiness and improves psychomotor vigilance performance. Sleep, 26(6), 695–700.

    Google Scholar 

  • Pimputkar, S., Speck, J. S., DenBaars, S. P., Nakamura, S. (2009): Prospects for LED lighting. Nat. Photonics, 3(4), 180–182.

    Article  Google Scholar 

  • Round, H. J. (1907): A note on carborundum. Electr. World, 19, 309.

    Google Scholar 

  • Schanda, J., Dányi, M. (1977): Correlated color temperature calculations in the CIE 1976 chromaticity diagramm. Color Res. Appl., 2(4), 161–163.

    Article  Google Scholar 

  • Schubert, E. F. (2006b): Light-emitting diodes, 2nd ed. (pp. 332–366). Cambridge: Cambridge University Press.

    Book  Google Scholar 

  • Schubert, E. F., Kim, J. K., Luo, H., Xi, J. Q. (2006a): Solid-state lighting—a benevolent technology. Rep. Prog. Phys., 69(12), 3069–3099.

    Article  Google Scholar 

  • Steele, R. V. (2007): The story of a new light source. Nat. Photonics, 1(1), 25–26.

    Article  Google Scholar 

  • Sust, C. A., Dehoff, P., Lang, D., Lorenz, D. (2012): Verbesserte Lebensqualität für demente Bewohner: Das Forschungsprojekt St. Katharina in Wien. Zumtoble Research.

  • Thapan, K., Arendt, J., Skene, D. J. (2001): An action spectrum for melatonin suppression: evidence for a novel non-rod, non-cone photoreceptor system in humans. J. Physiol., 535(1), 261–267.

    Article  Google Scholar 

  • Xi, Y., Schubert, E. F. (2004): Junction-temperature measurement in GaN ultraviolet light-emitting diodes using diode forward voltage method. Appl. Phys. Lett., 85(12), 2163–2165.

    Article  Google Scholar 

  • Xi, Y. G., Gessmann, T., Xi, J. Q., Kim, J. K., Shah, J. M., Schubert, E. F. (2005a): Junction temperature in ultraviolet light-emitting diodes. Jpn. J. Appl. Phys., 44(10), 7260–7266.

    Article  Google Scholar 

  • Xi, Y., Xi, J. Q., Gessmann, T., Shah, J. M., Kim, J. K., Schubert, E. F., Fischer, A. J., Crawford, M. H., Bogart, K. H. A., Allerman, A. A. (2005b): Junction and carrier temperature measurements in deep-ultraviolet light-emitting diodes using three different methods. Appl. Phys. Lett., 86(3), 031907.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, 8010, Graz, Austria

    Reinhold Hetzel &  Günther Leising

  2. LUMITECH Produktion und Entwicklung GmbH, Technologiepark 10, 8380, Jennersdorf, Austria

    Reinhold Hetzel &  Stefan Tasch

Authors
  1. Reinhold Hetzel
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Stefan Tasch
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Günther Leising
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Reinhold Hetzel.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Hetzel, R., Tasch, S. & Leising, G. Tunable natural light realized by phosphor-innovation light-emitting-diode technology. Elektrotech. Inftech. (2012). https://doi.org/10.1007/s00502-012-0105-1

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1007/s00502-012-0105-1

Keywords

Schlüsselwörter

Search

Navigation