Abstract of Publication No. 533
Avi Shalav, Bryce S. Richards, Karl Krämer and H. U. Güdel
This study investigates the performance of up-converting rare-earth phosphors
doped with different trivalent erbium (Er3+) concentrations: 2%, 20%, 50%,
100%, and with the addition of 20% ytterbium (Yb). The dominant up-conversion
(UC) mechanisms within these phosphors are discussed and examined using
photoluminescence and the spectral response from a bifacial silicon solar cell.
The most efficient phosphor examined had 20% Er doping and gave a maximum
external quantum efficiency close to 3.4% with 6 mW 1523 nm laser excitation.
The subsequent system internal quantum efficiency (accounting for reflection
losses within the cell) is calculated to be over 5.7%.