The solid-state emissive boron complex with multi-step mechanochromic luminescence was designed. The crystalline sample showed gradual changes in luminescent color triggered by scratching. The design concept is illustrated.
Thermally
stable dual emission followed by white-light luminescence
from hybrid materials is reported. Hybrid films were prepared with
a spin-coating method with the mixture solution containing tetraphenylethene
(TPE)-integrated polyhedral oligomeric silsesquioxane (POSS) and poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene
vinylene] (MEH-PPV). TPE-tethered POSS (TPE-POSS) showed high compatibility with MEH-PPV. Therefore,
homogeneous films with variable concentrations of TPE-POSS were obtained. Owing to good dispersion of rigid silica cubes into
matrices, POSS-containing films demonstrated high thermal stability
toward molecular rearrangement by annealing as well as pyrolysis,
similar to conventional polymer hybrids. Furthermore, it was found
that TPE-POSS was able to enhance emission efficiencies,
probably by suppressing chain aggregation. By modulating introduction
ratios of TPE-POSS, dual-emission properties followed
by white-light luminescence composed of cyan and orange emissions
from TPE-POSS and MEH-PPV, respectively,
were accomplished. It should be noted that these color balances can
be preserved even in the high-temperature region (425 K). Finally,
white-light luminescent materials with thermal durability were obtained.
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