Progress on Study of Luminescence of Rare Earth Organic Chelates

Ｓｉｎｃｅｒａｒｅｅａｒｔｈｃｈｅｌａｔｅｓｗｅｒｅｆｏｕｎｄｔｏｅｍｉｔｌａｓｅｒｉｎｔｈｅｂｅｇｉｎｎｉｎｇｏｆ 1 96 0ｓ ,ｔｈｅｆｌｕｏ ｒｅｓｃｅｎｃｅｐｒｏｐｅｒｔｉｅｓ ,ｅｆｆｉｃｉｅｎｃｙａｎｄｌｉｆｅｔｉｍｅｆｏｒｒａｒｅｅａｒｔｈｏｒｇａｎｉｃｃｈｅｌａｔｅｓｗｅｒｅｅｘｔｅｎｓｉｖｅｌｙｓｔｕｄｉｅｄ .Ｔｈｅｃｈｅｌａｔｅｓｗｅｒｅｐｒｏｖｅｄｎｏｔｔｏｂｅｓｕｉｔａｂｌｅｆｏｒｌａｓｅｒｍａｔｅｒｉａｌｓｉｎｔｈｅｅｎｄｏｆ1 970ｓ .Ｓｏｉｎｉｓｕｇｇｅｓｔｅｄｔｏｕｓｅｒａ…     

Preparation and Fluorescence Properties of Polymethyl Methacrylate Resin Incorporated with Sodium Tris （Pyridine Dicarboxylato）Europate

Based on the strong fluorescence and the highly thermal stability of sodium tris (pyridine dicarboxylato)eruopate(Na3Eu(DPA)3),polymethyl methacrylate(PMMA)composite material incorporated with the complex,PMMA:Na3Eu(DPA)3,was prepared at 250℃，The fluorescence behavior of PMMA:Na3Eu(DPA)3material was examined,The results show that the composite material keeps the luminescent characteristics of the Eu^3 chelate after PMMA is incorporated with Na3Eu(PDA)3,and strong orange-red emission of the composite wsa observed.The fluorescence intensity of the composite material increases with the increase of the weight ratio of Na3Eu(PDA)3to PMMA,but the relationship is not linear.     

Probing Lanthanide Ions Binding on tRNA~(Phe) by ~1H NMR

Ｔｈｅｉｎｃｒｅａｓｉｎｇｕｓｅｏｆｒａｒｅｅａｒｔｈｓｉｎａｇｒｉｃｕｌｔｕｒｅ，ｉｎｄｕｓｔｒｉｅｓａｎｄｍｅｄｉｃｉｎｅｓｍａｙｃａｕｓｅｔｈｅｈｕｍａｎ′ｓｆｏｏｄｃｙｃｌｅｐｏｌｕｔｅｄｂｙｒａｒｅｅａｒｔｈｓ，ｗｈｉｃｈｃｏｎｃｅｒｎｓａ...     

Synthesis of a Polyaminopolycarboxylic Acid and Fluorescence of Tb~(3 ) Complexes in Aqueous Solution

ＳｙｎｔｈｅｓｉｓｏｆａＰｏｌｙａｍｉｎｏｐｏｌｙｃａｒｂｏｘｙｌｉｃＡｃｉｄａｎｄＦｌｕｏｒｅｓｃｅｎｃｅｏｆＴｂ３＋ＣｏｍｐｌｅｘｅｓｉｎＡｑｕｅｏｕｓＳｏｌｕｔｉｏｎＧｏｎｇＭｅｎｇｌｉａｎ（龚孟濂），ＷｕＷｅｉｎｉｎｇ（吴炜宁），ＳｈｉＨｕ...     

Holmium-doped Porous Silicon Prepared by a New Electrochemical Approach and Its Photoluminescence

Ｐｏｒｏｕｓｓｉｌｉｃｏｎ（ＰＳ）ｗａｓｆｏｕｎｄｔｏｅｍｉｔｖｉｓｉｂｌｅｌｕｍｉｎｅｓｃｅｎｃｅａｔｒｏｏｍｔｅｍｐｅｒａｔｕｒｅｂｙＣａｎｈａｍｉｎ１９９０［１］．Ｔｈｉｓｐｈｅｎｏｍｅｎｏｎｉｍｐｌｉｅｄａｐｏｔｅｎｔｉａｌａｐｐｌｉｃａｔｉ...     

Synthesis and Fluorescence of Tb~(3 ) and Eu~(3 ) Complexes with N, N', N

ＳｙｎｔｈｅｓｉｓａｎｄＦｌｕｏｒｅｓｃｅｎｃｅｏｆＴｂ~（３＋）ａｎｄＥｕ~（３＋）ＣｏｍｐｌｅｘｅｓｗｉｔｈＮ，Ｎ＇，Ｎ＂－１，３，５－ｔｒｉａｚｉｎｅ－２，４，６－ｔｒｉｙｌｔｒｉｓ－［Ｎ－（ｃａｒｂｏｘｙｍｅｔｈｙｌ）］－ｇｌｙｃｉｎｅ￥Ｇｏｎ...     

稀土离子对大肠杆菌tRNA~(Leu)氨酰化反应的影响

金属离子不但对ｔＲＮＡ分子结构起稳定性作用，且为氨酰化反应所必需。稀土离子可以取代ｔＲＮＡ分子中与结构功能有关的固有的镁离子，较低浓度的稀土离子和镁离子一样参与氨酰化反应，金属离子浓度提高时稀土对氨酰化反应的激活作用不如镁，对于脱镁ｔＲＮＡ分子稀土离子的这种作用更为明显。稀土离子对氨酰化反应的影响可归因于其与ＡＴＰ及ｔＲＮＡ的强配位作用引起ＡＴＰ稳定性及ｔＲＮＡ分子构象发生某种改变所致。     

Characterization of Superfine Sr2CeO4 Powder Prepared by Microemulsion-Heating Method

Powder phosphor of Sr2CeO4 is prepared by microemulsion-heating method and a film of the phosphor on ITO glass is formed by electrophoretic deposition. Field emission scanning electron microscopy (FE-SEM) images show that the powder fired at 850 ℃ for 4 h has a spherical shape with an average diameter of 70 ～ 80 nm whereas the powder sintered at 900 ℃ for 4 h and 1000 ℃ for 4 h have shuttle-like and spherical shapes, respectively, with both sizes less than 1 μm.X-ray diffraction (XRD) patterns indicate that the superfine Sr2CeO4 exhibits an orthorhombic crystal structure. Roomtemperature photoluminescence (PL) measurements show that there are three excitation peaks located at around 262, 280and 341 nm, and all the Sr2CeO4 samples display an intense blue emission at 470 nm with CIE coordinate of (x, y) =(0.176, 0.283). The quantum yield of phosphor is high up to 0.47 ± 0.04. Compared with Sr2CeO4 samples prepared with traditional high-temperature heating, the phosphor synthesized with this method has a smaller size, lower calcination temperature, and shorter calcination time, and the main excitation and emission bands are blue shifted about 30 and 12 nm respectively. The startup voltage for Sr2CeO4 film on ITO glass shifts from 2700 to 4000 V with increasing thickness of the film.     

Encapsulation of Eu(TTA)3 into MCM-41 Mesoporous Molecular Sieve by Sol-Gel Method

Ｔｈｅｄｅｓｉｒａｂｌｅｌｕｍｉｎｅｓｃｅｎｃｅｃｈａｒａｃｔｅｒｉｓ ｔｉｃｓｏｆｓｏｍｅｌａｎｔｈａｎｉｄｅｉｏｎｓｂａｓｅｄｏｎｔｈｅｉｎｔｒａ ｆ ｏｒｂｉｔａｌｔｒａｎｓｉｔｉｏｎｓｈａｖｅｒｅｃｅｉｖｅｄｍｕｃｈａｔｔｅｎ ｔｉｏｎ.Ｒａｒｅｅａｒｔｈｃｏｍｐｌｅｘｅｓ,ｅｓｐｅｃｉａｌｌｙｔｈｏｓｅｃｏｎｔａｉｎｉｎｇＥｕ3 ａｎｄＴｂ3 ,ｏｆｔｅｎｅｘｈｉｂｉｔｇｏｏｄｌｕｍｉｎｅｓｃｅｎｃｅｏｗｉｎｇｔｏｔｈｅｓｔｒｏｎｇａｂｓｏｒｐｔｉｏｎｏｆｔｈｅｏｒｇａｎｉｃｌｉｇａｎｄｓａｎｄ…     

稀土荧光塑料的研究

组成为Eu(RCOCHCOR')_3L(L为有机碱)的一种稀土络合物作为荧光剂分别与PS和EVA制成荧光塑料。在低功率近紫外线灯的近紫外线(UV)辐隔下,它们能够发射波长为613nm的红色荧光。荧光强度比较高,但随UV辐照时间的增加而逐渐降低,然后趋于定值。这是络合物的配合键离解所致。这类荧光塑料具有一定的使用寿命。