Electroluminescent Property of A Novel Co-Doped Rare Earth Complex

A novel co-doped rare earth complex Gd0.5Eu0.5（TTA）3Dipy was synthesized and chosen as the emitter material in the organic electroluminescent device ITO/PVK：Gd0.5 Eu0.5 （TTA）3Dipy/PBD/A1. It was proved that there was Forster energy transfer from Gd^3＋ to Eu^3＋. The electroluminescent mechanism of the device was proposed by measuring and analyzing the emission and the excitation spectra of the emissive layer. Gd^3＋ might play the role of promoting the en- ergy transfer from PVK to Eu^3＋ and inhibiting an intrinsic luminescence of PVK. The device displayed red light with good monochromaticity. The possible energy transfer process of the device was preliminarily discussed.     

Effects of CeCl3 on Energy Transfer and Oxygen Evolution in Spinach Photosystem Ⅱ

Due to 4f electron characteristics and alternation valence, cerium involved in an oxidation-reduction reaction in plant, closely relating to photosynthesis. Our studies proved that cerium could promote photosynthesis and greatly improve spinach growth. However, the mechanism of promoting energy transfer and conversion by cerium remains unclear. Here we reported that the effects of Ce^3＋ on energy transfer and oxygen evolution in photosystem Ⅱ （PS Ⅱ ） isolated from spinach, which was related to 4f electron characteristics and alternation valence in Ce molecule. The methods of absorption spectrum, fluorescence spectrum were used in the research. Results showed that Ce^3＋ treatment at low concentration could suitably change PS Ⅱ mieroenvironment, increase the absorbance of visible light, improve the energy transfer among amino acids within PS Ⅱ protein-pigment complex, and accelerate energy transport from tyrosine residue to chlorophyll a. In summary, the photochemical activity of PS Ⅱ （fluorescence quantum yield） and its oxygen evolving rate were enhanced by Ce^3＋.     

Cs(6P)激发态的辐射及与Ne碰撞的能量转移

应用激光吸收和荧光方法,测量了Cs(6P)态与Ne碰撞的精细结构转移和碰撞猝灭截面.Cs原子被激光激发到6P3/2态,将与泵浦激光束反向平行的检测激光束调到6PJ→8S1/2的跃迁,测量6PJ激发态的密度及空间分布,由此计算了6PJ→6S的有效辐射率.在T=337 K和Ne密度0.5×1018＜N＜4×1018cm-3范围内测量了6P1/2→6S1/2(895 nm)发射的敏化荧光强度I895,量N/I895与N有抛物线型的关系,表明6PJ的猝灭是由于与Ne原子的碰撞产生的,而不是由与Cs基态原子碰撞产生的.由最小二乘法确定的二次多项式的系数得到6P态与Ne碰撞精细结构转移截面σ21=(1.90±0.82)×10-19 cm2,猝灭截面σD=(8.97±3.85)×10-19 cm2.     

Yb3+/Pr3+共掺TeO2-ZnO-Na2O玻璃的能量传递和上转换发光

制备了Yb3+/Pr3+共掺TeO2-ZnO-Na2O玻璃.研究了980 nm泵浦下上转换发光光谱,分析了上转换发光机制.基于吸收光谱对Pr3+在TZN玻璃进行了Judd-Ofelt分析,计算了荧光跃迁几率,激发态辐射寿命,和荧光分之比.在450-750 nm范围内有多处上转换荧光,依次为479 nm(3P0→3H4),542 nm(3P0→3H5),589 nm(1D2→3H4),621 nm(3P0→3H6),651 nm(3P0→3F2)和687 nm(1D2→3H5).其中651 nm(3P0→3F2)红光明显强于其它以Pr3+ 3P0为初始能级的上转换光(479 nm,542 nm,621 nm).通过Dexter理论,计算得到了碲酸盐玻璃中Yb3+→Pr3+共振能量转移参数为CD-A=2.67×10-40 cm6/s, 转移效率为16.5%.     

高效有机太阳能聚光器研制成功

据《科学》（Science）杂志报道说，他们开发了一种更为有效的用有机太阳能聚光器来捕捉太阳能量的方法，这种方法可以使某个太阳能电池中积蓄的能量增）加10倍之多。太阳能聚光器中的一个类别是应用有色染料来吸收日光，然后将能量转移到太阳能电池中储存。但是，该电池一种持续存在的问题是能量在转移途中会损失，因为这些染料会对某些日光进行再吸收。     

磷酸伯喹的辐射稳定性及其对聚乙烯醇(PVA)辐射裂解的影响

磷酸伯喹经吸收0.75～10Mrad剂量后,在结构上未发现变化。由于喹啉基的共轭,它对能量的转移作用是相当大的,当聚乙烯醇(PVA)中加入磷酸伯喹时,可使PVA的裂解延缓(但对裂解的机理不产生影响)。磷酸伯喹含量以线性关系影响着PVA的各种裂解参数值。     

Ne^3P0,2）与乙腈的能量转移反应研究

在流动余辉装置上，我们研究了亚稳态原子Ｎｅ（＾３Ｐ０，２）与乙腈的能量转移反应，观察到了ＣＮ（Ａ－Ｘ），ＣＮ（Ｂ－Ｘ），ＣＨ（Ａ－Ｘ）的发射谱。计算了ＣＮ（Ａ，Ｂ）的相对振动粒子数布居，并对该反的机理进行了讨论。     

Gd3＋对SrWO4：Dy3＋荧光粉发光性能的影响？

采用水热微乳液法合成了SrWO4：Dy3＋,Gd3＋系列发光材料。利用XRD、SEM和荧光测试对热处理后样品的结构、形貌和发光性能进行了表征。 XRD结果表明：SrWO4：Dy3＋,Gd3＋的结构属四方晶系。以365nm紫外光为激发源,测得SrWO4：0．05Dy3＋,0．05Gd3＋的发光光谱主要发光峰位于487nm、575nm处,分别对应于Dy3＋的4 F9/2→6 H15/2、6 H13/2跃迁,Gd3＋可以增强Dy3＋发光强度;当Gd3＋掺杂的摩尔分数大于2%时,出现了浓度猝灭现象。色坐标分析显示：荧光粉的色坐标随着掺杂离子Gd3＋的浓度加入量改变而发生变化。 x（Gd3＋）为1%的样品的色坐标为（0．332,0．311）,位于标准白光点的色坐标范围内。     

改进激光染料激光性能的能量转移途径

本文对用能量转移途径改进激光染料激光性能作了系统的归纳和评述，讨论激光染料分子间或分子内能量转移产生的效果。     

γ射线辐照磷酸三丁酯气相产物形成机理及其能量转移动力学

本工作通过对γ射线辐解TBP的气相产物分析,得到了体系吸收剂量外推接近零时各气相产物的G值,解释了DBP+MBP酸性产物和气相产物求物料平衡时的差数。还研究了DPSO-TBP体系能量转移动力学,从烃类产物谱中求得的动力学参数与测定酸性产物(DBP+MBP)求得的一致。在此基础上进一步探讨了氢气形成途径:一种可能来源于刺迹(spur)反应,而另一种则为抽氢反应。