Enhancing Solar Energy Conversion Efficiency: A Tunable Dual-Excitation Dual-Emission Phosphors and Time-Dependent Density Functional Theory Study

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• 作者：Shixun Lian ; Chunying Rong ; Dulin Yin ; Shubin Liu
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：April 16, 2009
• 年：2009
• 卷：113
• 期：15
• 页码：6298-6302
• 全文大小：193K
• 年卷期：v.113,no.15(April 16, 2009)
• ISSN：1932-7455

文摘

The concept of dual-excitation dual-emission (DE²) phosphors for the enhancement of solar energy conversion is introduced in this work. Doping alkaline earth cations as an aggregated energy trap within the sulfur host in a controlled manner resulted in the DE² phosphors with tunable fluorescent emission properties. It had been found the Ca_0.6Sr_0.4S:0.005Cu⁺,0.001Eu²⁺ phosphor is the optimal DE² composition. We demonstrated by field testing results their potentials in enhancing sunlight harvesting to increase production of agricultural plants. Time-dependent density functional theory calculations provide insights about their excitation and emission mechanisms. These DE² phosphors can be applied to a variety of fields, as additives to increase production of agricultural crops, as nanosensor and biolabeling materials for ultrasensitive or green-sensitive detection of biological species such as antibodies, DNA and cells, and other places.