Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 2, Issue 29, Pages 5769-5777Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tc00482e
Keywords
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Funding
- Shanghai Science & Technology Committee [12521102501]
- Shanghai Educational Committee [11ZR1426500]
- Innovation Program of Shanghai Municipal Education Commission [14ZZ127]
- PCSIRT [IRT1269]
- Program of Shanghai Normal University [DZL124]
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Highly efficient Cr3+- and Yb3+/Nd3+-co-activated YAl3(BO3)(4) (YAB) phosphors have been developed as spectral convertors for improving silicon solar cell photovoltaic conversion efficiency. In the YAB lattice, Cr3+ ions act as broadband spectral sensitizers by absorbing UV-Vis (370-750 nm) photons, which are not absorbed by the silicon solar cell. After energy transfer, the Yb3+ acceptors then exhibit strong NIR emission centered at around 1000 nm, which is coupled well with the absorption band of the silicon solar cell. Efficient energy transfer is reflected by a sharp decrease in the excited state lifetime and red photoluminescence (PL) from Cr3+ with increasing Yb3+ concentration. Further evidence in favor of energy transfer is that PL-excitation spectra of NIR luminescence from Yb3+ are identical to those of deep red emission from Cr3+. Trivalent ions Gd3+, Bi3+ and La3+ have been introduced into YAl3(BO3)(4):Cr3+, Yb3+ in this study for a stronger NIR PL intensity. Additionally, energy transfer from Cr3+ to Nd3+ is also observed. Yb3+, Nd3+-co-activated YAB shows much broader NIR emission. Due to the effective absorption of Cr3+ in the visible region in YAB and the efficient energy transfer to Yb3+/Nd3+, these materials can be developed as spectral convertors to improve silicon solar cell photovoltaic conversion efficiency.
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