Near-infrared DC approach by Bi3+-Yb3+ co-doped YAG phosphor

作者：Sawala N S^*; Omanwar S K

来源：Research on Chemical Intermediates, 2017, 43(2): 693-702.

DOI：10.1007/s11164-016-2646-0

• Luminescence
• Downconversion
• Inorganic phosphor YAG
• Co-operative energy transfer
• Solar cells
• Solid state reaction method

Bi3+-Yb3+ ion pair co-doped YAG phosphors were successfully synthesized using conventional solid state reaction method varying the concentration of Yb3+ ions from 0.5 to 10 mol%. The optimum phosphors were characterized by powder X-ray diffraction (XRD), and surface morphology was studied with a scanning electronic microscope (SEM). The photoluminescence (PL) properties were studied with a spectrophotometers in near infrared (NIR) and ultraviolet visible (UV-Vis) regions. The synthesized phosphors can convert a photon of UV region (330 nm) into photons of NIR region (979 and 992 nm). The co-operative energy transfer (CET) was studied using a time decay curve and PL spectra. The theoretical value of quantum efficiency (QE) was calculated from steady time decay measurement, and the maximum efficiency approached up to 166.91 %. Hence, this phosphor could be used as a downconversion (DC) luminescent convertor in front of crystalline silicon solar cell (c-Si) panels to reduce heat loss due to spectral mismatch of the solar cells.

• 出版日期2017-2