Realizing an excellent spectral response by utilizing the ultraviolet parts of solar radiation is an important focus for enhancing the performance of photovoltaic cells (PCs). Pr3+ and Eu3+ ions co-doped multifunctional transparent GdPO4 glass-ceramic is successfully prepared using a conventional melting quenching technique. In GdPO4: Pr3+-Eu3+, ultraviolet to visible downshifting is realized via the remarkable energy transfer from Pr3+ to Eu3+ ions by bridge Gd3+ ions. Introducing the spectral conversion material by converting ultra-violet photons into visible photons is considered a very promising route; it can be applied to perovskite PCs by reducing the photo-degradation and enhancing the light harvesting, and it can be applied to hydrogenated amorphous-silicon carbide PCs by reducing the solar energy losses associated with spectral mismatch of the spectral response and energy. The development of downshifting Pr3+-Eu3+ co-doped glass-ceramics might open up a new approach to achieving a better performance of photovoltaic devices.
An efficient and compact all-solid-state continuous wave 67-nm red laser is generated by intracavity frequency doubling of a diode pumped Nd∶YVO4 laser at 1342 nm while suppressing the higher gain transition near 1064 nm. With the incident pump power of 40 W and a frequency doubling crystal lithium triborate, as high as 10.5-W output power at 671 nm is achieved. The optical-to-optical conversion efficiency is 26.3% and the output power stability during 8 h of operation is better than 2.3%. To the best of our knowledge, this is the highest conversion efficiency of watt-level laser at 671 nm generated by intracavity frequency doubling of a diode pumped Nd∶YVO4 laser at 1342 nm.
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