Transparent rare earth ion-doped hexagonal sodium yttrium fluoride oxyfluoride glass-ceramics and preparation method thereof

Abstract

The invention provides a transparent rare earth ion-doped hexagonal sodium yttrium fluoride oxyfluoride glass-ceramics and a preparation method thereof. The glass is prepared from the following compositions: 50-70mol% of SiO2, 3-12mol% of Al2O3, 15-20mol% of Na2O, 5-12mol% of NaF and 5-12mol% of YF3, and a sum of the compositions is 100 percent; and the glass also is prepared from ErF3 which accounts for 0.1-1mol% of the sum of the compositions, wherein the molar content ratio of SiO2 to Al2O3 is larger than 6.5. Compared with silicate glass, the hexagonal sodium yttrium fluoride oxyfluoride glass-ceramics has lower phonon energy (as low as 230cm<-1>), lowers the multi-phonon nonradiative relaxation rate of rare earth ions, and thus enabling the up-conversion luminescence efficiency of the rare earth ions in the glass-ceramics to be obviously improved.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a transparent rare earth ion doped β-NaYF 4 Oxyfluoride glass-ceramic and its preparation method. Background technique [0002] Rare earth-doped upconversion luminescent materials have attracted extensive attention in various fields because of their unique luminescent properties. However, up-conversion phosphors prepared by synthesis methods such as water / solvothermal method, liquid phase co-precipitation method, and thermal decomposition method have limitations in the application of solid-state lasers due to their high scattering and opacity. Therefore, we expect to obtain bulk upconversion materials with high transparency, good chemical and mechanical stability. [0003] Oxide glass has obvious advantages in chemical stability, mechanical strength and other indicators, but the phonon energy of oxide glass is too high, which leads to the unsatisfactory up-conversion lumine...

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Problems solved by technology

However, for rare earth-doped oxyfluoride glasses of general composition, low-temperature heat treatment can only obtain α-NaYF 4 , while β-NaYF 4 It is often obtained through a higher heat treatment temperature. At this time, the size of the nanocrystalline crystallization is too large, and the silicate phase is precipitated, resulting in devitrification of the glass, and the obtained α-NaYF 4 with β-NaYF 4 mixed phase, so it does not really play a role in β-NaYF 4 The advantages in up-conversion luminescence cannot meet the requirements of practical applications

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