Near-infrared quantum cutting in Tb3+, Yb3+ co-doped calcium tungstate via second-order downconversion

作者：Wang Zhaofeng; Wang Yuhua^*; Li Yezhou; Zhang Huijuan

来源：Journal of Materials Research, 2011, 26(5): 693-696.

DOI：10.1557/jmr.2011.6

Near-infrared quantum cutting involving the conversion of one visible photon into two near-infrared photons was demonstrated in Ca0.99-xYbxWO4: Tb-0.01 phosphors. From the analysis of the refinement of x-ray diffraction patterns, the suitable concentration range of Yb3+ in Ca0.99WO4: 0.01Tb(3+) was determined to be 0-20%. By investigating their luminescent spectra and decay lifetimes, second-order downconversion from Tb3+ to Yb3+ were proved and the possible quantum cutting mechanism was proposed. Quantum efficiency related to Yb3+ concentration was calculated and the maximum efficiency was reached at 140.4%. Because the energy of Yb-3 (+) F-2(7/2) -> F-2(5/2) transition matches well with the band gap of the crystalline Si, the Ca0.99-xYbxWO4: Tb-0.01 phosphors could be potentially applied in silicon-based solar cells.

• 出版日期2011-3
• 单位兰州大学