Eu（MBA）2NO3Phen配合物的发光光谱

在７７Ｋ测定了Ｅｕ（ｏ－ＭＢＡ）＿２ＮＯ＿３Ｐｈｅｎ和Ｅｕ（ｍ－ＭＢＡ）＿２ＮＯ＿３Ｐｈｅｎ配合物的激发光谱，发光光谱和时间分辨光谱。光谱数据说明由于邻甲基的位阻影响，在Ｅｕ（ｏ－ＭＢＡ）＿２ＮＯ＿３Ｐｈｅｎ配合物里存在化学环境稍有不同的两种Ｅｕ￣（３＋）格位，它们的局部对称性分别为ｃ＿２ｖ和ｃ＿１，ｃ＿２或ｃ＿ｓ。在Ｅｕ（ｍ－ＭＢＡ）＿２ＮＯ＿３Ｐｈｅｎ配合物里，仅存在一种Ｅｕ￣（３＋）格位，它类似于前一个配合物的ｃ＿２ｖ对称性的Ｅｕ￣（３＋）格位。     

Sr2SiO4:Eu3+发光材料的制备及其光谱特性

采用溶胶-凝胶法制备了Sr2SiO4:Eu3+发光材料. 测量了Sr2SiO4:Eu3+材料的激发与发射光谱, 发射光谱主峰位于618 nm处;监测618 nm发射峰时, 所得激发光谱主峰分别为320、397、464 和518 nm. 研究了Sr2SiO4:Eu3+材料在618 nm的主发射峰强度随Eu3+浓度的变化情况. 结果显示, 随Eu3+浓度的增大, 发射峰强度先增大; 当Eu3+浓度为7%时(x), 峰值强度最大; 而后随Eu3+浓度的增大, 峰值强度减小. 在Eu3+浓度为7%的情况下, 研究了电荷补偿剂Li+的掺杂浓度(x(Li+))对Sr2SiO4:Eu3+材料发射光谱强度的影响. 结果显示, 随x(Li+)的增大, 材料发射光谱强度先增大后减小, 当x(Li+)为8%时, 峰值强度最大.     

Na5Eu（MoO4）4中加入（WO4）^2—后的结构和发光增强效应

研究了Na_5Eu(MoO_4)_4在制备时加入H_2WO_4后的发光增强效应。固溶体Na_5Eu(Mo_(1-x)W_xO_4)_4的x值在0相似文献   

Synthesis and photovoltaic properties of new europium complex Eu（DBM）3（CPyBM）

A new europium（Ⅲ） complex, tris（dibertzoylmethanate）{ 1-[9-hexyl-9-carbazole]-2-（2-pyridyl）-bertzimidazole}europium（Ⅲ） [Eu（DBM）a（CPyBM）] was synthesized and used as an electron-acceptor and electron-transport layer in organic photovoltaic （PV） device. Power conversion efficiency achieved from the device was 1.04% under illumination with 365 nm UV light at 1.6 mW/cm^2. Compared with the previous reported devices based on Eu（Ⅲ） complexes, the PV performances were improved. The working mechanism of the organic PV device was discussed.     

Synthesis of Eu（Ⅲ） and Tb（Ⅲ） Complexes with Two New Amide Type Podands and Their Luminescence Properties

Two new amide type podands L1 and L2 (L1=1,1,1-tris{[2-benzylaminoformyl)phenoxyl] methyl} propane,L2=1,3,5-timethyl-2,4,6-tris{[2-benzylaminoformyl)phenoxyl]methyl} benzene)and their europium and terbium nitrates complexes were synthesized.The luminescence properties of these complexes were also studied.     

Sr3SiO5降温过程分解及对制备Sr3SiO5:Eu2+的影响

采用高温固相反应法制备Sr3SiO5:Eu2+时,往往有Sr2SiO4:Eu2+共存,从而影响Sr3SiO5:Eu2+的发光性能.本文采用DSC/TG、淬冷法结合XRD,研究了Sr3SiO5:Eu2+在降温过程中的分解反应.结果表明,Sr3SiO5是在1 250℃以上稳定存在的化合物,在降温过程中Sr3SiO5在1 250℃分解为Sr2SiO4和SrO.采用快速降温的方法可以抑制Sr3SiO5的分解.当降温速率小于10℃·min-1时,Sr3SiO5全部分解为Sr2SiO4和SrO;当降温速率为15℃·min-1时,样品主要物相为Sr3SiO5,但有少部分Sr3SiO5发生分解,当降温速率增大到20℃·min-1时,Sr3SiO5分解的量更少,即随着降温速率增大,Sr3SiO5分解的量减小,从而获得几近纯相的Sr3SiO:Eu2+荧光粉.     

Preparation and Luminescence Behavior of CaSiO3：Eu^3＋（Bi^3＋）

CaSiO3：Eu0.08^3＋Bi0.002^3＋ with a monoclinic perovskite structure was synthesized by using sol-gel method, and its luminescence characteristics were investigated. From the excitation spectrum, it can be seen that the main peaks located at 238,396,415,437 and 359 nm correspond to the charge-transfer band of Eu^3＋-O^2- , the absorption transitions of ^7F0.1→^3L6, ^7F0→^5D3, ^7F1→^5D3 of Eu^3＋ ions, and ^3P1→^1S0 of Bi^3＋ ions, respectively. When the samples were excited with a light of wavelength 359 or 395 nm, it can be seen from the emission spectrum that the electronic dipole transition located at 609 nm corresponding to ^5D0→^7F2 of Eu^3＋ ions was stronger than the magnetic dipole transition located at 587 nm corresponding to ^5D0→^7F1 of Eu^3＋ ions, which shows that more Eu^3＋ ions were located in nonreversion center lattices. The energy transfer from Bi^3＋ ions to Eu^3＋ ions in the phosphor was also discussed. The results show that Eu^3＋ ions could be well sensitized by ^3＋ions, and the energy-transfer pattern between Bi^3＋ ions and Eu^3＋ ions was resonance energy transfer.     

Structure and Crystal Growth of Li2Zn2（MoO4）3

Single crystal of Li2Zn2(MoO4)3 has been grown from a flux of Li2MoO4 by the top-seeded solution-growth method,and its structure was refined by the Rietveld method. It belongs to the orthorhombic system,space group Pnma with a=5.1114,b=10.4906 and c=17.6172. Good agreement between the experimental and calculated profile(Rp=6.69%,Rwp=9.73% and Rexp= 6.58%) was reached.     

Synthesis and Structure of [Er4（μ3—OH）4（Hpro）4（Pro）2（H2O）7]（ClO4）6.7H2O

1 INTRODUCTION The design and synthesis of polynuclear com- plexes have attracted chemists?attention in the contemporary chemistry, since their clusters maybe lead to novel materials with magnetic, optical, electronic and catalytic properties of the constituent metals[1～3]. It is also prevalently interesting to synthesize high-nuclearity metal complexes for their nanoscopic dimensions[3, 4]. Spectroscopic properties of the lanthanides are widely used in the study of biological systems. …     

Synthesis and Structure of Ba3La2（BO3）4 Crystal

1 INTRODUCTION At present the researches on more efficient solid-state laser materials become more important for the rapid development of diode-laser pumped solid-state laser. More researches have been devoted to the double borate compounds RX3(BO3)4 (R = Y, La, Gd and X = Y, Al, Sc), some of which exhibit good chemical and physical properties[1～10]. The rare earth and alkali-halide double borates M3Ln2(BO3)4 (M = Ca, Sr, Ba and Ln = LaLu and Y) were reported in literatures[11…     

Sr2SiO4∶Dy3+材料制备及发光特性

采用高温固相法制备了Sr2SiO4∶Dy3+发光材料. 在365 nm紫外光激发下, 测得Sr2SiO4∶Dy3+材料的发射光谱为一个多峰宽谱, 主峰分别为486, 575和665 nm; 监测575 nm的发射峰, 所得材料的激发光谱为一个多峰宽谱, 主峰分别为331, 361, 371, 397, 435, 461和478 nm. 研究了Dy3+掺杂浓度对Sr2SiO4∶Dy3+材料发射光谱强度的影响. 研究结果显示, 随着Dy3+浓度的增大, 黄、蓝发射峰比值(Y/B)也逐渐增大; 随着Dy3+浓度的增大, 575 nm发射峰强度先增大后减小. 加入电荷补偿剂Li+, Na+和K+均提高了Sr2SiO4∶Dy3+材料的发射光谱强度, 其中以Li+的情况最为明显.     

Li2Eu3Br2[BO3]2: A New Europium(II) Halide Oxoborate with Yellow Luminescence

The europium(II) oxoborate Li₂Eu₃Br₂[BO₃]₂ featuring lithium and bromide ions was synthesized by the reaction of Eu₂O₃ with Li[BH₄] as lithium- and boron- as well as EuBr₃ as bromide-source at 750 °C for 24 h in silica-jacketed sealed niobium capsules. The yellow, air-stable and yellow fluorescent compound crystallizes in the trigonal space group R3 m (a = 1049.06(7) pm, c = 2993.1(3) pm, c/a = 2.853, Z = 12). The two crystallographically distinguishable Eu²⁺ cations show either an eightfold coordination as bicapped trigonal prism ([EuO₆Br₂]^12–) or a ninefold coordination as monocapped square antiprism ([EuO₅Br₄]^12–). All oxygen atoms stem from isolated triangular [BO₃]^3– anions and the Li⁺ cations reside in octahedral voids provided by both oxygen atoms and Br^– anions.     

Eu(BA)3phen的晶体结构和荧光光谱

标题配合物晶体属三斜晶系，Ｐ１空间群，晶胞参数ａ＝１０７９２（２）ｎｍ，ｂ＝１１８９６（２）ｎｍ，ｃ＝１２４４６ｎｍ，α＝１０５１２（３）°，β＝９３７６（３）°，γ＝１１３１９（３）°，Ｖ＝１３９２（１）ｎｍ－３，Ｚ＝２，Ｄｘ＝１６５９ｇ·ｃｍ－３。配合物晶体由双核分子组成，两个中心Ｅｕ３＋通过羧基桥联，它们的化学环境相同。Ｅｕ３＋的配位数为８，其配位多面体为一畸变的四方反棱柱体。在７７Ｋ配合物的荧光光谱说明配合物中仅存在一种Ｅｕ３＋格位。     

双核铕-间甲基苯甲酸邻菲罗琳[Eu(m-MBA)_3PHEN](H_2O)_2三元配合物的晶体结构和荧光光谱

标题配合物晶体属Cc空间群,a=1.5955(6)nm,b=1.8508(6)nm,c=2.2595(9)nm,β=97.79(4)°,Z=4,Dx=1.52g/cm~3,T=295K.用I>3σ(I)的7316个可观察衍射数据对92个非氢原子的原子坐标和各向异性温度因子进行全矩阵最小二乘法精修,最终的偏离因子R=0.043.中心Eu(Ⅲ)离子与周围6个氧和一对氮原子配位,配位多面体属四方反棱柱体,其点对称性为C_1.以Eu(Ⅲ)离子为荧光探针,77K下测得配合物多晶样品的高分辨激光激发光谱和发射光谱,激发光谱表明配合物中Eu(Ⅲ)离子仅有一种晶格格位.~5D_0→~7F_J(J=0～2)跃迁光谱表明中心Eu(Ⅲ)离子在77K下具有C_1对称性.     

Luminescence Tuning of Sr8MgCe(PO4)7:Eu2+,Mn2+ Phosphors: Structure Refinement,Site Occupancy,and Energy Transfer

Sr₈MgCe(PO₄)₇:Eu²⁺,Mn²⁺ phosphor with whitlockite‐type structure was prepared by a combustion‐assisted solid‐state reaction. The crystal structure and luminescence properties were investigated. Under UV radiation, Sr₈MgCe(PO₄)₇ host exhibits a violet‐blue emission band from Ce³⁺ ions. When Eu²⁺/Mn²⁺ are doped into the host, the samples excited with 270 nm UV radiation present multicolor emissions due to the energy transfer (ET) from Ce³⁺ to Eu²⁺/Mn²⁺. The emitting color of Sr₈MgCe(PO₄)₇:Eu²⁺ can be tuned from violet‐blue to yellow‐green, whereas Sr₈MgCe(PO₄)₇:Mn²⁺ can emit red light. Under excitation with long wavelength at 360 nm, Sr₈MgCe(PO₄)₇:Eu²⁺ phosphor shows a broadband emission from 390 to 700 nm, which is attributed to the 4f⁶5d¹→4f⁷ transition of Eu²⁺ without the contribution from Ce³⁺ emission. Tunable full‐color emitting light can be achieved in the Eu²⁺ and Mn²⁺‐codoped Sr₈MgCe(PO₄)₇ phosphor by ET_Eu–Mn through control of the levels of doped Eu²⁺ and Mn²⁺ ions. These results suggest that Sr₈MgCe(PO₄)₇:Eu²⁺,Mn²⁺ phosphor has potential applications in NUV chip pumped white LEDs.     

Synthesis,structures and luminescence of two new Europium(II) Silicate-Chlorides,Eu2SiO3Cl2 and Eu5SiO4Cl6

Eu₂SiO₃Cl₂ and Eu₅SiO₄Cl₆ were prepared by reaction of EuCl₂ with EuSiO₃ and Eu₂SiO₄, respectively, Sr₂SiO₃Cl₂: Eu²⁺ from mixtures of SrCO₃, Eu₂O₃, SrCl₂ · 6H₂O and SiO₂ under reducing conditions. The crystal structures of Eu₂SiO₃Cl₂ [a = 1118.7(5), c = 952.6(1) pm, tetragonal, I4/m, Z = 8, R = 3.3, R_w = 3.0%] and Eu₅SiO₄Cl₆ [a = 900.4(1), b = 1401.7(2), c = 1112.3(2) pm, β = 103.51(1)°, monoclinic, C2/c, Z = 4, R = 3.6, R_w = 2.6%] were determined from four-circle diffractometer data and compared with related compounds. The luminescence properties were investigated at 300 K and at 4.2 K; all compounds show intense bluish-green photoluminescence. Sr₂SiO₃Cl₂:Eu²⁺ shows thermoluminescence.     

Preparation and Luminescence Behavior of CaSiO3:Eu3+(Bi3+)

CaSiO3:Eu3 0.08Bi3 0.002 with a monoclinic perovskite structure was synthesized by using sol-gel method, and its luminescence characteristics were investigated. From the excitation spectrum, it can be seen that the main peaks located at238, 396, 415, 437 and 359 nm correspond to the charge-transfer band of Eu3 -O2- , the absorption transitions of 7F0,1→5 L6,7F0→5D3,7F1→5D3 of Eu3 ions, and 3P1→1S0 of Bi3 ions, respectively. When the samples were excited with a light of wavelength 359 or 395 nm, it can be seen from the emission spectrum that the electronic dipole transition located at 609 nm corresponding to 5D0 →7F2 of Eu3 ions was stronger than the magnetic dipole transition located at 587 nm corresponding to 5D0→7F1 of Eu3 ions, which shows that more Eu3 ions were located in nonreversion center lattices. The energy transfer from Bi3 ions to Eu3 ions in the phosphor was also discussed. The results show that Eu3 ions could be well sensitized by Bi3 ions, and the energy-transfer pattern between Bi3 ions and Eu3 ions was resonance energy transfer.     

SiO2凝胶中铕(铽)-间甲基苯甲酸-邻菲咯啉配合物的热稳定性及发光性能研究

采用溶胶 凝胶法 ,以掺杂方式制备了含有铕 (铽 ) 间甲基苯甲酸 邻菲咯啉配合物的SiO2凝胶复合发光体 ,研究了其热分解曲线、激发光谱和发射光谱 ,并与固体粉末进行了比较 ,讨论了将配合物引入该凝胶后对其热稳定性及发光的影响。