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Textured VO2(011) microcrystals are grown in the monoclinic, M1 phase whichundergo a reversible first order semiconductor to metal transition (SMT)accompanied by a structural phase transition to rutile tetragonal, R phase.Around the phase transition, VO2 also experiences noticeable change in itsoptical and electrical properties. A change in color of the VO2 micro crystalsfrom white to cyan around the transition temperature is observed, which isfurther understood by absorption of red light using temperature dependentultraviolet-visible spectroscopic analysis and photoluminescence studies. Theabsorption of light in the red region is explained by the optical transitionbetween Hubbard states, confirming the electronic correlation as the drivingforce for SMT in VO2. The thermochromism in VO2 has been studied for smartwindow applications so far in the IR region, which supports the opening of theband gap in semiconducting phase; whereas there is hardly any report in themanagement of visible light. The filtering of blue light along with reflectionof infrared above the semiconductor to metal transition temperature make VO2applicable as advanced smart windows for overall heat management of a closure.

VO2 microcrystals as advanced smart window material at semiconductor to metal transition