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Saturated green phosphors for LED applications

Jonas Joos (UGent) , Katrien Meert (UGent) , Anthony Parmentier (UGent) , Jonas Botterman (UGent) , Dirk Poelman (UGent) and Philippe Smet (UGent)
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Abstract
Solid state light sources possess several advantages over traditional light sources (like incandescent or fluorescent lamps), including a long lifetime, high efficiency, small footprint and the absence of toxic substances. While for general lighting applications a wide emission spectrum is preferred to increase the colour rendering, display applications require light sources with a saturated emission colour. In this work, we explore green luminescent materials which can efficiently convert the emission from a blue light emitting diode (LED). First a variety of phosphors hosts (including SrSi2O2N2, Ba3Si6O12N2, ZnGa2S4 and SrGa2S4) are doped with divalent europium, and evaluated in terms of luminescence properties, thermal quenching and efficiency. Then Sr1-xEuxGa2S4 phosphors are studied in more detail over a wide dopant concentration range (x = 0.01 to 0.3), as function of temperature. The phosphors show a saturated green emission, with a peak wavelength around 536nm and a FWHM of 50nm. The internal quantum efficiency is 71% for x = 0.04. For this concentration, the emission intensity at 400K is still 90% of the intensity at room temperature. By measuring decay and thermal quenching profiles as a function of europium concentration, we were able to explain the emission properties on the basis of the local environment of the europium ions in the lattice.

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Chicago
Joos, Jonas, Katrien Meert, Anthony Parmentier, Jonas Botterman, Dirk Poelman, and Philippe Smet. 2012. “Saturated Green Phosphors for LED Applications.” In NB Photonics Annual Meeting, Abstracts.
APA
Joos, J., Meert, K., Parmentier, A., Botterman, J., Poelman, D., & Smet, P. (2012). Saturated green phosphors for LED applications. NB Photonics annual meeting, Abstracts. Presented at the NB Photonics Annual Meeting 2012.
Vancouver
1.
Joos J, Meert K, Parmentier A, Botterman J, Poelman D, Smet P. Saturated green phosphors for LED applications. NB Photonics annual meeting, Abstracts. 2012.
MLA
Joos, Jonas, Katrien Meert, Anthony Parmentier, et al. “Saturated Green Phosphors for LED Applications.” NB Photonics Annual Meeting, Abstracts. 2012. Print.
@inproceedings{4109419,
  abstract     = {Solid state light sources possess several advantages over traditional light sources (like incandescent or fluorescent lamps), including a long lifetime, high efficiency, small footprint and the absence of toxic substances. While for general lighting applications a wide emission spectrum is preferred to increase the colour rendering, display applications require light sources with a saturated emission colour. In this work, we explore green luminescent materials which can efficiently convert the emission from a blue light emitting diode (LED). First a variety of phosphors hosts (including SrSi2O2N2, Ba3Si6O12N2, ZnGa2S4 and SrGa2S4) are doped with divalent europium, and evaluated in terms of luminescence properties, thermal quenching and efficiency.
Then Sr1-xEuxGa2S4 phosphors are studied in more detail over a wide dopant concentration range (x = 0.01 to 0.3), as function of temperature. The phosphors show a saturated green emission, with a peak wavelength around 536nm and a FWHM of 50nm. The internal quantum efficiency is 71\% for x = 0.04. For this concentration, the emission intensity at 400K is still 90\% of the intensity at room temperature. By measuring decay and thermal quenching profiles as a function of europium concentration, we were able to explain the emission properties on the basis of the local environment of the europium ions in the lattice.},
  author       = {Joos, Jonas and Meert, Katrien and Parmentier, Anthony and Botterman, Jonas and Poelman, Dirk and Smet, Philippe},
  booktitle    = {NB Photonics annual meeting, Abstracts},
  language     = {eng},
  location     = {Ghent, Belgium},
  title        = {Saturated green phosphors for LED applications},
  year         = {2012},
}