CuAlCl4 exemplifies a new class of phosphors based on metal halide analogues of aluminophosphates.
The α- and β-CuAlCl4 phases show brilliant blue to blue-green luminescence. The electronic structure of the
CuAlCl4 corner sharing tetrahedral frameworks has been explored by fluorimetric and diffuse reflectance
measurements on the isomorphous series α-CuAlBr
x
Cl4
-
x
(x = 0−4). The photoluminescence is demonstrated
to be a bulk property of the electronically isolated CuCl4/2 tetrahedra within the framework matrix. Remarkably,
the structural framework is flexible such that at least 1 mol of small molecule gases per CuAlCl4 formula unit
can be reversibly sorbed. The sorption/desorption of small molecule gases further results in the reversible
quenching of the photoluminescence.
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