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Volume 8, Issue 2 (Suppl)
Chem Sci J 2017
ISSN: 2150-3494 CSJ, an open access journal
Euro Chemistry 2017
May 11-13, 2017
May 11-13, 2017 Barcelona, Spain
4
th
European Chemistry Congress
Phosphor solutions for the reduction of the time dependant intensity variation of AC LEDs
Simon Korte
1
and
Thomas Justel
2
1,2
Munster University of Applied Sciences, Germany
A
C driven LEDs show very high wall plug efficiency combined with a good colour rendering and long-term stability. For general
lighting, LEDs have surpassed the traditional incandescent and fluorescent lamps years ago. (1) However, LEDs still have
a tremendous drawback, which is known as flicker. Perceived flicker is caused by the time dependant variation of the luminous
intensity of a light source. The consequences for humans under such illumination situations expand from headaches to neurological
problems, even including epileptic seizure (2). Since many research activities in this field are conducted to solve or to reduce problems
accompanied by flicker, we came upwith a possible solution to it. Since the zero point of anAC current cannot be turned out completely,
the solution must be based on the used conversion layer (mostly a phosphor particle or ceramic layer) or a combination of a driver
systems and the used converter in order to smoothen the Flicker to 100%. In this work a couple of standard LED phosphors have
been tested, such as Y
3
Al
5
O
12
:Ce
3+
, BaMgAl
10
O
17
:Eu
2+
Mn
2+
, CaAlSiN
3
:Eu
2+
, Ca
3
Sc
2
Si
3
O
12
:Ce
3+
Mn
2+
and Sr
2
P
2
O
7
:Eu
2+
Mn
2+
with respect
to flicker reduction. It will be demonstrated why Y
3
Al
5
O
12
:Ce
3+
won’t lead to a solution for this problem and possible solutions will be
discussed. The capability of other phosphors to reduce flicker will be shown. From these findings requirements for the development
of novel phosphors to reduce the flicker problem will be drawn. A prediction will be given concerning the future potential of this
technique and achievments so far will be presented.
Biography
Simon Korte has gained his bachelor degree in chemical engineering and his master degree, specialising on material science, at the University of Applied Science
MUnster. Subsequently he started his PhD studies at the University of Applied Science MUnster and does his research on “luminescent materials for flicker
reduction of AC-LEDs“ in the working group of Prof. Thomas JUstel.
korte.simon@fh-muenster.deSimon Korte et al., Chem Sci J 2017, 8:2(Suppl)
http://dx.doi.org/10.4172/2150-3494-C1-008