Good Risk News: Heavy Metals, Carbon (Graphene) Power

Silicon-based LED’s Free of  Heavy Metals:

CFL’s turned out to have mercury; LED’s turned out to have lead, arsenic, cadmium, zinc, and amazingly high retail costs.  What about a lighting source which solves all of those issues?    Karlsruhe Institute of Technology and the University of  Toronto researchers have manufactured multicolored silicon-based LED’s using silicon nanocrystals, adjusting the size of the nanoparticles to make different colors, heavy metal-free.

Karlsruhe Institute of Technology (2013, February 22). “Light from silicon nanocrystal LEDs: Scientists develop multicolor LEDs”.  (Reference Below.)

Graphene Gains Power:

Instead of burning carbon, what about using it to absorb light and even convert into electricity as a solar cell?  Researchers from the Institute of Photonic Science,  MIT,  Max Planck Institute for Polymer Research, and Graphenea S.L. Donostia have discovered yet another property of graphene, the ability to absorb a low energy photon and release many excited electrons, efficiently converting light into electricity with positive implications for solar cells and other technologies.

ICFO-The Institute of Photonic Sciences (2013, February 24). Graphene: A material that multiplies the power of light.


  1. Florian Maier-Flaig, Julia Rinck, Moritz Stephan, Tobias Bocksrocker, Michael Bruns, Christian Kübel, Annie K. Powell, Geoffrey A. Ozin, Uli Lemmer. Multicolor Silicon Light-Emitting Diodes (SiLEDs). Nano Letters, 2013; 13 (2): 475 DOI: 10.1021/nl3038689
  2. K. J. Tielrooij, J. C. W. Song, S. A. Jensen, A. Centeno, A. Pesquera, A. Zurutuza Elorza, M. Bonn, L. S. Levitov, F. H. L. Koppens. Photoexcitation cascade and multiple hot-carrier generation in graphene. Nature Physics, 2013; DOI: 10.1038/nphys2564
© 2013 Sigrid Caroline Schroder. All Rights Reserved.