Photovoltaic And Temperature Sensing Applications Of Rare Earth Up-conversion Phosphors

Rare earth ions provide abundant energy levels for applications such as laser medium, phosphor, data storage, biology label, optical communication, etc. In this manuscript, we focus on the applications of solar cell’s full spectrum utilization and fluorescence temperature sensing.Er/Yb codoped fluorescent powders were prepared by liquid combusting method. Phase composition and emission spectrum were respectively observed by XRD and WDS-3.And then Er/Yb codoped borosilicate glasses were fabricated. We use them to improve the silicon solar cell’s utilization of full solar spectrum. In the glasses transmittance spectra and their up-conversion luminescence, wavelength conversion from deep UV and IR region to visible light were found. Total wavelength conversion made about1%increasing of the solar cell’s efficiency when the luminous flux was constant.Er/Yb codoped fluorescent powders were also used in temperature sensing. During laser spectroscopic measurement, a part of exciting light and emitting light converted into the heat(nonradiative process). Temperature monitoring were used to evaluated nonradiative process. Up-conversion luminescence of phosphor Y2O3:Er, Yb was observed when we use laser excitation at980nm. The temperature of fluorescent powders was measured by fluorescent intensity ratio technology. Laser induced temperature rising can be presented by a calibration function: lnR=3.1738-1167/T. As laser output power increases, laser heating make temperature of the analyte present monotonically increasing. Circumstances around heating point will modify the calibration function, but the linear slope of inR～1/T is constant(1167K).