Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7906586 | Optical Materials | 2018 | 9 Pages |
Abstract
BaZn2(BO3)2 self-activated phosphors were prepared by the conventional high temperature solid-state method. The PL spectra of BaZn2(BO3)2 powders prepared under reductive and air atmosphere consist of a weak ultraviolet emission band (â¼410 nm) and a broad emission band which were centered at â¼Â 500 and 545 nm, respectively. According to the spectral analysis and EPR results, the green and yellow emissions may arise from the transitions of photo-generated electron close to the conduction band to the deeply trapped hole in single ionized oxygen vacancy (V+ o) centers and single negatively charged interstitial oxygen ion (O- i), respectively. An efficient broadband near-infrared (NIR) quantum cutting was demonstrated in Yb3+ doped BaZn2(BO3)2 phosphor. Upon excitation with an ultraviolet photon at 375â¯nm, the emissions of two NIR photons at 983â¯nm from Yb3+ ions were achieved. The dependences of the visible and NIR emissions, the decay lifetime, the energy transfer efficiency, and the quantum efficiency on the Yb3+ doping content were investigated in detail. The results indicated that the maximum energy transfer and the corresponding downconversion quantum efficiency could reach between 68.5% and 168.5%.
Related Topics
Physical Sciences and Engineering
Materials Science
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Authors
Hua Yu, Degang Deng, Weitao Su, Chenxia Li, Shiqing Xu,