Domestic Calendering Method to Prepare Rare Earths Fluorescent Glass

The reporter recently learned from Baotou Research Institute of Rare Earths that the new material research and development team of the institute successfully prepared fluorescent glass using rare earths as raw materials and calendered to prepare high-power white LED sample lamps for phosphors, setting a domestic precedent for this technology.

According to Shen Leijun, technical expert of Baotou Research Institute of Rare Earths and leader of the functional material luminescence research group, the research and development team has successfully developed white LED phosphors and phosphors for multiple material systems such as aluminate, silicate, and tungstomolybdate. Yellow and red fluorescent glasses are excited by blue light, and red fluorescent glass has been patented, forming a patent pool of 12 invention patents.

Fluorescence from rare earth (RE) doped samples indicate substantial partitioning into the fluoride crystals. Eu3+ doped glasses emit only red luminescence, but after treatment emits blue, green, and red luminescence, indicative of low phonon energy RE environment. It was determined that active RE partitioning into the LaF3 nanocrystallites that form upon heat treatment are responsible for the novel optical properties of these hybrid materials.

Rare earth luminescent materials have the characteristics of narrow emission band, high color purity, bright colors, high conversion efficiency, wide emission wavelength distribution area, and wide fluorescence lifetime. They hold stable physical and chemical properties, high temperature resistance. It has excellent performance that other luminescent materials cannot match.

To this end, the Baotou Research Institute of Rare Earths R&D team has continuously promoted the transformation of scientific and technological achievements. After completing technical breakthroughs, it has initially realized the preparation of garnet system-doped yellow fluorescent glass by calendering method, and the high-power white LED sample lamp is prepared using this as the phosphor. Pioneered the large-scale preparation technology of fluorescent glass for high-power solid-state lighting.

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