A zeolite-free synthesis of luminescent and photochromic hackmanites

Le résumé fourni par la source

In order to further boost their potential applications as optical materials by improving structural and compositional tuneability, hackmanites (Na8(AlSiO4)6(Cl,S)2) exhibiting multiple optical properties such as photoluminescence, persistent luminescence, and tenebrescence, were synthesised in a solid-state reaction using simple starting materials. All materials with the desired structure showed both blue-white photoluminescence typical of synthetic hackmanite, and white persistent luminescence, which have not previously been reported for hackmanites synthesised using zeolite-free methods. The typical orange luminescence of disulfide seen in natural hackmanites after 365 nm excitation was not observed. Samples made under optimised synthesis conditions of heating at 900 °C for 72 h followed by a reduction also showed purple tenebrescence typical of hackmanite. The optical energy storage properties of hackmanites made without zeolite A, as well as potential methods for tuning them, are discussed for the first time. These materials have previously been investigated for potential as multifunctional optical markers and for optical multiplexing; these results further the understanding of hackmanites and bring them one step closer to commercial viability as optical materials.

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