Fabrication, negative thermal expansion and optical properties of scandium molybdate thin films

Negative thermal expansion in Sc2Mo3O12:Sm3+ for white LEDs and unveiling the impact of phase transition on cryogenic luminescence

“…the Sc-O-Mo bonds, which is assisted by polyhedron tilting and 3D couple twisting with an increase in temperature. 20,21,47 These structural motions result in a decrease of the Sm-Mo distance and Sm-O-Mo bond angle, which strengthen the MoO 4 2À -to-Sm 3+ energy transfer. 3 Consequently, the enhanced CTB absorption between O 2À and Sm 3+ at elevated temperatures induced by NTE led to thermally enhanced luminescence of Sm 3+ ions.…”

“…It offers advantages, such as low temperature synthesis, strong NTE, and excellent chemical stability. [18][19][20][21] Sc 2 Mo 3 O 12 exists in the orthorhombic and monoclinic phases, and undergoes a temperatureresponsive phase transition between the two phases. The orthorhombic phase displays a strong NTE and is stabilized in the temperature range of À93 1C to 800 1C, with a high average thermal expansion coefficient (À6.3 Â 10 À6 1C À1 ).…”