研究目的
Investigating the two-photon threshold of rare-earth up-conversion under concentrated sunlight to establish a tangible limit for the benefit and effect of solar concentration on up-conversion for photovoltaic and solar thermal applications.
研究成果
The study established a tangible limit for the benefit and effect of solar concentration on up-conversion for photovoltaic and solar thermal applications by investigating the two-photon threshold of rare-earth up-conversion under concentrated sunlight. The same threshold was observed for a higher Er3+ content of 50%, but a threshold that exceeds 2300 suns at 15% Er3+.
研究不足
The study is limited to the investigation of the two-photon threshold of rare-earth up-conversion under concentrated sunlight using NaYF4: Er3+ as the up-converter. The role of energy transfer on the threshold was only investigated for Er3+ contents of 15% and 50%.
1：Experimental Design and Method Selection:
The study used a solar furnace to generate an irradiance of up to 2606 suns on the samples, with NaYF4: Er3+ as the up-converter. The transition for up-conversion photoluminescence from a quadratic relation to linear relation as solar concentration was increased was observed.
2：Sample Selection and Data Sources:
Samples with different Er3+ contents (15% and 50%) were used to investigate the role of energy transfer on the threshold.
3：List of Experimental Equipment and Materials:
Solar furnace, NaYF4: Er3+ up-converter.
4：Experimental Procedures and Operational Workflow:
The solar concentration was varied from 34 to 2606 suns, and the up-conversion luminescence emissions from Er3+ energy level 4I11/2 at 980 nm were observed.
5：Data Analysis Methods:
The integrated luminescence was used to establish the threshold where a quadratic relation of the solar concentration-dependent becomes linear.
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