1，3—Diphenyl—5—（9—phenanthry1）—2—pyrazoline（DPPhP）：An Excellent Ho1e—Transport Material for Use in Organic Light—Emitting Diodes

An excellent hole-transport material,1,3-diphenyl-5-(9-phenanthryl)-2-pyrazoline(DPPhP)for OLEDs was studied.This compound not only offers hlgh glass transition temperature(Tg=96℃）,good film forming ability,and high HOMO energy level,but also displays excellent hole-transport property.The electrlumlnescent device with a simple structure of ITO/DPPhP(60nm)/AIQ(60mm)/LiF(0.8nm)/Al shows an external quantom efficiency as high as 1.6?     

5位芘取代的三芳基吡唑啉化合物的光物理行为

合成了化合物 1 ,3 二苯基 5 ( 1 芘基 ) 2 吡唑啉 (DPPP) .由于 5位大取代基的存在 ,使整个分子不在同一平面 ,导致吡唑啉化合物光物理性质的改变 .DPPP光物理行为的研究表明 :即使在较低的浓度下 ( c=1 .0 8× 1 0 -5 mol·L-1) ,DPPP分子间也易生成电荷转移络合物 ;其荧光光谱表现出明显的溶剂极性效应、浓度效应和温度效应 ,不同的环境条件下可发射芘单体的荧光、分子内电荷转移络合物的荧光及分子间电荷转移络合物的荧光 .     

Li-ion batteries: Phase transition

Progress in the research on phase transitions during Li+extraction/insertion processes in typical battery materials is summarized as examples to illustrate the significance of understanding phase transition phenomena in Li-ion batteries.Physical phenomena such as phase transitions(and resultant phase diagrams) are often observed in Li-ion battery research and already play an important role in promoting Li-ion battery technology. For example, the phase transitions during Li+insertion/extraction are highly relevant to the thermodynamics and kinetics of Li-ion batteries, and even physical characteristics such as specific energy, power density, volume variation, and safety-related properties.     

有序/无序岩盐结构的Li1+xM1-xO2锂离子电池正极材料

锂过量层状有序/无序锂离子电池正极材料因具有出色的电化学性能而被人们广泛关注,并成为研究热点之一.所有该类型材料可以被表述为Li1+xM1-xO2(M是一种或一种以上的过渡金属元素,x≥0).但M通常是多个金属元素比如M=Ni1-x-yCoxMny,一些金属元素在材料中也可以具有多种价态形式例如Ni和Mn,而且可有不同...     

Photoinduced electron transfer of [ Ru (bpy)_2 (4, 4''''-dcbpy)]~(2 ) with electron donors

Emission quenching of [Ru(bpy)2(4, 4'-dcbpy)] (PF6)2 (1) by benzenamine,4-[2-[5-[4-[4-dimethylamino]phenyl]-4,5-di-hydro-1-phenyl-1H-pyrazol-3-yl]-ethenyl]-N,N-dimetyl (2) or 1, 5-diphenyl-3-(2-phenothiazine)-2-pyrazoline (3) was observed. Measurements of the emission decay of 1 before and after addition of 2 or 3 by single photon counting technique con-finned the observations. The emission quenching of 1 by 2 or 3 was submitted to Stern-Volmer equation. It was calculated that the quenching rate constants (kq) are 5.5 × 109(mol/L)-1s-1 for 2 and 4.0 × 109(mol/L)-1s-1 for 3, respectively. These results indicated a character of dynamic quenching process. The singlet-state of 2 or 3 was also quenched by 1. The quenching behaviors did not conform to the Stern- Volmer equation and involved both static and dynamic quenching processes. The apparent quenching rate constant (kapp) was calculated to be 3 × 109 (mol/L)-1 for the interaction of excited 2 with 1, and 1.2 × 109 (mol/L)-1 for that of excited 3 wit     

吡唑啉衍生物的电化学性质及其能带结构

有机 /聚合物电致发光是当今世界上的热门研究领域[1 ,2 ] ,因而有机 /聚合物电致发光材料的能带结构成为非常重要的研究课题[3] .目前 ,确定有机 /聚合物电致发光材料的能带结构的方法主要有电化学法[4] ,光谱法[5] ,量子化学计算法[6] ,紫外光电子能谱法[7] ,光电子发射法[8] 等 .这些方法中 ,由于电化学方法操作简单 ,对仪器设备要求不高 ,故被广泛使用 .虽然不同的测试方法测得的能带数据存在一定的系统误差 ,但由于电发光器件中考虑的是材料间的能带匹配 ,因此 ,在不同的条件下测定的能带数据相对来说是可信的 .吡唑啉化合物具有较高的…     

5-位取代吡唑啉化合物的发光行为及其在电致发光领域中的应用

合成了一系列5位不同取代的2－吡唑啉化合物，研究了取代基对吡唑啉化合物 物理性质的影响。结果表明，在吡唑啉化合物的5位引入稠环取代基提高了吡唑啉 化合物的熔点；同时，5位取代基的电位性质还影响着化合物的发光行为。DSC差热 分析结果给出1，3－二苯基－5－（9－菲基）－2－吡唑啉（TAP7）的玻璃化温度 (T_g)为96 ℃；并研究了其在电致发光器件上的应用性能。结果表明TAP7是一种具 有高热稳定性的空穴传输及蓝光发光材料。     

1,3-Diphenyl-5-(9-phenanthryl)-2-pyrazoline (DPPhP): An Excellent Hole-Transport Material for Use in Organic Light-Emitting Diodes

Ｏｒｇａｎｉｃｌｉｇｈｔ ｅｍｉｔｔｉｎｇｄｉｏｄｅｓ (ＯＬＥＤｓ)ｕｓｉｎｇｓｍａｌｌｏｒｇａｎｉｃｍｏｌｅｃｕｌｅｓｈａｖｅｒｅｃｅｉｖｅｄｃｏｎｓｉｄｅｒａｂｌｅｉｎｔｅｒｅｓｔａｆｔｅｒｔｈｅｉｎｉｔｉａｌｗｏｒｋｂｙＴａｎｇｅｔａｌ.1ｉｎ 1987,ｆｏｒｔｈｅｐｏｔｅｎｔｉａｌｏｆｕｓｉｎｇｔｈｅｓｅｄｅｖｉｃｅｓａｓｌｏｗ ｃｏｓｔａｌｔｅｒｎａｔｉｖｅｉｎｌｉｇｈｔｉｎｇ ,ｂａｃｋｌｉｇｈｔａｎｄｆｌａｔｐａｎｅｌｄｉｓｐｌａｙｓ .Ｍｕｃｈｐｒｏｇｒｅｓｓｈａｓｂｅｅｎｍａｄｅｒｅｃｅｎ…