Abstract
We report high refractive-index (RI) films composed of polyhedral oligomeric silsesquioxane (SSQ) matrices and various lanthanoid cations. The SSQ matrices were constructed from octaammonium SSQ by connecting with bipyridine dicarboxylic acid, which is expected to capture cations. By modulating the feed ratio between SSQ and dicarboxylic acid, the series of the SSQ matrices were obtained with variable cross-linking ratios among the SSQ units. Thin transparent films were able to be prepared through the drop-casting method with the aqueous mixtures containing SSQ matrices and various kinds of lanthanoid salts up to 40 wt %. From RI measurements, it was revealed that the increase of the amount of the metal ion can significantly lift up the RI values. In particular, critical losses of Abbe numbers, which theoretically have the trade-off relationship toward increases in RI values, were hardly detected. This effect could be obtained by cation assembly in local spots that are assisted by SSQ.
Highlights
One of modern strategies for obtaining high refractive-index (RI) plastics is to prepare hybrid materials with polymer matrices and metal particles or ions [1]
It was shown that lanthanoid cations can be efficiently captured in the presence of the appropriate ligand structures [50]
By applying the assembling effect of SSQ, it can be expected that an additional enhancement to RI values is expected without losses of
Summary
One of modern strategies for obtaining high refractive-index (RI) plastics is to prepare hybrid materials with polymer matrices and metal particles or ions [1]. Kudo et al reported that the RI values of the polymer films can be lifted up by connecting the polymer chain ends with the rigid building blocks [23,24,25,26] Based on this finding, we prepared the SSQ networks composed of oligosulfide linkers and detected the increase in the RI of conventional polymer films by blending these sulfur-containing SSQ networks without enlarging wavelength dependency of light refraction represented by an Abbe number [27]. We found that the RIs of the films can be tuned by modulating the amount of cations without significant changes in the Abbe numbers These results mean that the optical properties in the trade-off relationship are balanced in the SSQ matrices
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