A single matrix negative thermal expansion white light phosphor and its sintering synthesis method

Abstract

The invention belongs to the field of inorganic nonmetallic materials, and particularly discloses a novel single-substrate negative thermal expansion white light phosphor with the molecular formula ofZr0.3Sc1.7Mo2.7V0.3O12. Two sintering methods are disclosed, namely, a solid phase method and a sol-gel method. The novel single-substrate negative thermal expansion white light phosphor Zr0.3Sc1.7Mo2.7V0.3O12 has a stable negative thermal expansion property in a range from the room temperature to 400 DEG C and can emit white fluorescent light under the excitation of ultraviolet light, wherein the chromaticity coordinates (0.3420, 0.3404) of white light under 370 nm excitation are close to the chromaticity coordinates (0.330, 0.330) of standard white light, which indicates that Zr0.3Sc1.7Mo2.7V0.3O12 is an excellent single-substrate white light phosphor under near ultraviolet excitation and has engineering application value.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a single matrix negative thermal expansion white light phosphor and a sintering synthesis method thereof. Background technique [0002] Most materials in nature have the characteristics of thermal expansion and cold contraction, but there is also an abnormal phenomenon of "thermal contraction and cold expansion" in nature, that is, negative thermal expansion. The thermal expansion and contraction of materials and the mismatch of expansion coefficients between materials will affect the performance of the device or even cause permanent failure. At present, with regard to negative thermal expansion materials, the urgent problem we are facing is to actively search for new negative thermal expansion materials and explore effective preparation methods for unknown materials; to implement effective performance regulation on existing negative thermal expansion m...

AI Technical Summary

Problems solved by technology

For example, commonly studied oxide negative thermal expansion materials include ZrW2O8, a common AM 2 o 8 However, this material restricts its application. The problem is that ZrW2O8 is a metastable phase material at room temperature, and it undergoes a phase transition at around 150 °C, and it is easy to decompose when combined with other materials.

Another common negative expansion material A 2 m 3 o 12 (A is a trivalent cation, which can be a transition metal or a rare earth element, and A can also be replaced by a tetravalent cation and a divalent cation; M is W or Mo) The series must be transformed from a monoclinic phase to an orthorhombic phase. Exhibiting negative thermal expansion properties, this series of materials has problems such as phase transition, water absorption problems or poor mechanical properties

Images