Ce，Pr离子双掺LuAG透明陶瓷制备及光学性能

Fabrication and Optical Properties of Ce,Pr Co-doped LuAG Transparent Ceramics

以NH_4OH+NH_4HCO_3混合溶液作为复合沉淀剂,利用反向滴定共沉淀法制备了不同浓度Ce,Pr共掺杂LuAG沉淀前驱体,并研究了Pr掺杂浓度为0.25at%,Ce掺杂浓度分别为0、0.1at%、0.2at%和0.3at%的LuAG透明陶瓷的光学性能。沉淀前驱体经马弗炉1200℃煅烧2 h后所得粉体的分散性较好,一次颗粒尺寸约为60 nm。该粉体经干压和冷等静压成型后,在H_2气氛1800℃下烧结6 h制备出透明陶瓷,经双面抛光后透明陶瓷在800 nm波长处直线透过率达到82%。X射线激发的发射光谱表明,共掺使Pr离子5d-4f的发射能量传递给Ce离子,有助于提高LuAG透明陶瓷在550 nm发光中心的发光强度。0.2at%Ce和0.25at%Pr共掺杂时,透明陶瓷的发光强度达到最大。

Cerium and Praseodymium co-doped Lu3A15012 nanocrystalline powders were synthesized by reverse ti- tration, using ammonium hydroxide CNH4OH） and ammonium hydrogen carbonate （NHaHCO3） mixed precipitator. The optical properties of 0.25at%Pr： LuAG ceramics doped with 0, 0. l at%, 0.2at% and 0.3at% Ce^3＋ ions were measured. The Ce, Pr： LuAG powders showed a weak agglomeration with a primary particle size of about 60 nm after calcining at 1200℃ for 2 h. Ce, Pr co-doped LuAG transparent ceramics were obtained after green compacts were cold isostatic pressed and sintered in flowing H2 atmosphere at 1800 ℃ for 6 h. The in-line transmittance of the double face polished Ce, Pr co-doped LuAG ceramic at 800 nm wavelength was 82%. The X-ray excited emission spectrum showed that the emission intensity at 550 nm wavelength was enhanced in Ce, Pr co-doped LuAG transparent ceramics by energy transfer from 5d-4f of Pr3＋ ions to Ce^3＋ ions, and the emission intensity reached maximum value when the dopant con- tents were 0.2at%Ce and 0.25at%Pr.