A Review of Luminescent Anionic Nano System: d10 Metallocyanide Excimers and Exciplexes in Alkali Halide Hosts

Materials

Xiaobo Li¹ 

[1] Department of Chemistry, University of Maine, Orono, ME 04469, USA; E-Mail:

关键词: excimers;    exciplexes;    d¹⁰ cyanide systems;    alkali halide nano systems;    dimmers;    trimers;   

DOI  :  10.3390/ma6072595

来源: mdpi

【 摘 要 】

Dicyanoaurate, dicyanoargentate, and dicyanocuprate ions in solution and doped in different alkali halide hosts exhibit interesting photophysical and photochemical behavior, such as multiple emission bands, exciplex tuning, optical memory, and thermochromism. This is attributed to the formation of different sizes of nanoclusters in solution and in doped hosts. A series of spectroscopic methods (luminescence, UV-reflectance, IR, and Raman) as well as theoretical calculations have confirmed the existence of excimers and exciplexes. This leads to the tunability of these nano systems over a wide wavelength interval. The population of these nanoclusters varies with temperature and external laser irradiation, which explains the thermochromism and optical memory. DFT calculations indicate an MLCT transition for each nanocluster and the emission energy decreases with increasing cluster size. This is in agreement with the relatively long life-time for the emission peaks and the multiple emission peaks dependence upon cluster concentration.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.