<p>Metal-organic framework
(MOF) glasses are a newly discovered family of melt-quenched glasses.
However, so far it is not known whether these glasses exhibit photonic
functionalities. Here, we show the discovery of the luminescent behavior of a
MOF glass, i.e., the cobalt doped zeolitic imidazolate frameworks-62 (ZIF-62)
glass (Zn<sub>1-<i>x</i></sub> Co<i><sub>x</sub></i> (Im)<sub>1.9</sub> (bIm)<sub>0.1</sub>,
<i>x</i> = 0, 0.1 and 0.5), which was obtained by melt-quenching its
corresponding ZIF-62 crystal. The synthesized crystal was precipitated in the
form of spherical nano/micro-crystalline structure, which collapses structurally to form laminated
glass with ultrahigh glass forming ability and the same short
range molecular structure of the parent crystalline MOF. We observed the super-broadband mid-infrared (Mid-IR) luminescence (in the
wavelength range of 1.5 µm – 4.8 µm) both in the crystalline and amorphous
phases. The observed Mid-IR emission originates from d-d transition of Co<sup>2+</sup>
ions that is protected by the strong Co-N coordination. The discovery of the luminescent glasses may
pave the way towards new photonic applications of bulk MOF glasses,
such as Mid-IR lasers.
</p>
Crystalline Hydrogen Bond of Water Molecules Confined in a Metal-Organic Framework
