科研之友
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摘要
The authors have designed and synthesized a family of high-performance inorganic-organic hybrid phosphor materials composed of extended and robust networks of one, two, and three dimensions. Following a bottom-up solution-based synthetic approach, these structures are constructed by connecting highly emissive Cu4I4 cubic clusters via carefully selected ligands that form strong Cu-N bonds. They emit intensive yellow-orange light with high luminescence quantum efficiency, coupled with large Stokes shift, which greatly reduces self-absorption. They also demonstrate exceptionally high framework-and photostability, comparable to those of commercial phosphors. The high stabilities are the result of significantly enhanced Cu-N bonds, as confirmed by the density functional theory (DFT) binding energy and electron density calculations. Possible emission mechanisms are analyzed based on the results of theoretical calculations and optical experiments. Two-component white phosphors obtained by blending blue and yellow emitters reach an internal quantum yield as high as 82% and correlated color temperature as low as 2534 K. The performance level of this subfamily exceeds all other types of Cu-I based hybrid systems. The combined advantages make them excellent candidates as alternative rare-earth element-free phosphors for possible use in energy-efficient lighting devices.
- 出版日期2017-1
- 单位rutgers
