Dual-Emissive Photoluminescent Langmuir−Blodgett Films of Decatungstoeuropate and an Amphiphilic Iridium Complex
| Autor: | Toshihiro Yamase, Catherine E. Housecroft, Angel López-Muñoz, Edwin C. Constable, Takayuki Konya, Diego Repetto, Miguel Clemente-León, Eugenio Coronado, Stefan Graber, Takeru Ito, Kevin Doyle |
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| Rok vydání: | 2009 |
| Předmět: |
Langmuir
education.field_of_study Brewster's angle Aqueous solution Photoluminescence Chemistry business.industry Analytical chemistry Surfaces and Interfaces Condensed Matter Physics Langmuir–Blodgett film symbols.namesake Optics Monolayer Electrochemistry symbols General Materials Science Dimethyldioctadecylammonium bromide education Luminescence business Spectroscopy |
| Zdroj: | Langmuir. 26:1316-1324 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la902513z |
| Popis: | Langmuir monolayers and Langmuir-Blodgett (LB) films of the decatungstoeuropate [Eu(W(5)O(18))(2)](9-) (EuW(10)) and the amphiphilic Ir complex 1 have been successfully fabricated by using the adsorption properties of the EuW(10) polyanion dissolved in the aqueous subphase onto a positively charged 1 monolayer at the air-water interface. The compression isotherms and Brewster angle microscopy (BAM) of monolayers of 1 on pure water (1 monolayer) and on a subphase containing 10(-6) M EuW(10) and 10(-3) M NaCl (1/EuW(10) monolayer) have been studied. Infrared and UV-vis spectroscopy of the transferred LB films indicate that EuW(10) and 1 molecules are incorporated within these LB films. X-ray reflectivity (SXR) and atomic force microscopy (AFM) experiments indicate that LB films of 1 present a heterogeneous morphology while 1/EuW(10) films show a flatter and more homogeneous surface as well as a layered structure with a periodicity of 4.1 nm. Mixed monolayers of 1 and DODA (dimethyldioctadecylammonium bromide) have been prepared with EuW(10) polyanions in the subphase to control the concentration of 1 and EuW(10) polyanions within the LB films. AFM and SXR experiments with the transferred LB films show that the dilution of 1 with DODA improves the layered structure. The luminescence of 1 is partially quenched by EuW(10) in the 1/EuW(10) LB films, while emission from EuW(10) is not detected. On the other hand, emission from both entities is preserved in the LB films prepared from mixed DODA/1 monolayers, in which the red and yellow emissions arise independently from EuW(10) and 1, respectively. The different DODA:1 ratios lead to changes in the emission color. Therefore, they constitute a promising color-tunable luminescent material. |
| Databáze: | OpenAIRE |
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