Danielson E, Devenney M, Giaquinta DM, Golden JH, Haushalter RC, McFarland EW, Poojary DM, Reaves CM, Weinberg WH, Wu XD
Symyx Technologies, 3100 Central Expressway, Santa Clara, CA 95051, USA. The authors all contributed equally to this work.
Science. 1998 Feb 6;279(5352):837-9. doi: 10.1126/science.279.5352.837.
An unusual luminescent inorganic oxide, Sr2CeO4, was identified by parallel screening techniques from within a combinatorial library of more than 25,000 members prepared by automated thin-film synthesis. A bulk sample of single-phase Sr2CeO4 was prepared, and its structure, determined from powder x-ray diffraction data, reveals one-dimensional chains of edge-sharing CeO6 octahedra, with two terminal oxygen atoms per cerium center, that are isolated from one another by Sr2+ cations. The emission maximum at 485 nanometers appears blue-white and has a quantum yield of 0.48 +/- 0.02. The excited-state lifetime, electron spin resonance, magnetic susceptibility, and structural data all suggest that luminescence originates from a ligand-to-metal Ce4+ charge transfer.
通过平行筛选技术，从由自动薄膜合成制备的超过25000个成员的组合库中鉴定出一种不寻常的发光无机氧化物Sr2CeO4。制备了单相Sr2CeO4的块状样品，根据粉末X射线衍射数据确定其结构，结果显示出由边共享的CeO6八面体组成的一维链，每个铈中心有两个末端氧原子，这些链通过Sr2+阳离子相互隔离。在485纳米处的发射最大值呈现蓝白色，量子产率为0.48±0.02。激发态寿命、电子自旋共振、磁化率和结构数据均表明发光源自配体到金属Ce4+的电荷转移。
