Schiff碱配合物荧光粉的合成及光谱性能研究

Synthesis and Spectral Properties of Phosphors Based on Schiff Base Complexes

有机电致发光材料具有主动发光、视角广、对比度高等显著特点。稀土有机配合物电致发光材料目前备受广大研究者的关注。以水杨醛和苯甲酸衍生物为原料,经酯化、肼化及希夫碱缩合合成了水杨醛对甲氧基苯甲酰腙(1-H2L)、水杨醛对甲基苯甲酰腙(2-H2L)、水杨醛对溴基苯甲酰腙(3-H2L)3种配体,以Pr(NO3)3为原料,合成了水杨醛酰腙系列镨稀土配合物,经红外光谱、紫外光谱等分析手段对该类配合物的结构进行表征,配体在3136~3141cm-1出现羟基ν(OH)伸缩振动峰,在配合物的红外光谱中消失,配合物在3330~3368cm-1之间的吸收峰归属为结晶的H2O的ν(O—H)羟基弯曲振动吸收峰,配合物在与配体对应的3140cm-1均不出现羟基吸收峰,三种配体及配合物的吸收波形相似,反映出配体及配合物的结构基本一致,但配体与配合物的吸收波峰相差较大,据此可推测配体已经配位。采用荧光分光光度计测定了该类配合物的荧光光谱,并讨论了配体取代基的变化对荧光强度的影响。配体分别在352,369,365和417nm波长监测下,于517nm处出现发射峰。其中3-H2L的荧光强度最高。配合物均在470nm的蓝光激发下,分别于608和617nm出现镨的电偶极跃迁特征发射峰,归属于3P0→3F2跃迁。配合物均可被470nm蓝光激发,在608~617nm处有较好的红光发射,该类荧光粉有望应用于OLED上进行应用。

Organic electroluminescent materials have significant features such as activeil lumination, wide viewing angle, and high contrast. Rare earth organic complex electroluminescent materials are currently attracting the attention of research ers. In this paper, salicylaldehyde and benzoic acid derivatives are used as raw materials to synthesize salicylaldehyde p-methoxybenzoyl hydrazide (1-H2L) and salicylaldehyde p-methylbenzene by esterification, deuteration and Schiff base condensation. Synthesis of salicylaldoxime series lanthanum rare earth complexes with pyroglycol (2-H2L), salicylaldehyde-bromobenzoylhydrazide (3-H2L) ligands and Pr(NO3) 3 as raw materials The structures of the complex es were characterized by infrared spectroscopy and ultraviolet spectroscopy. The ligand is a hydroxyl ν(OH) stretching vibration peak at 3 136~3 141cm^-1 , which disappears in the infrared spectrum of the complex. The absorption peak of the complex between 3 330~3 368cm^-1 belongs to the crystalli zed H2O. The (OH) hydroxyl bending vibration absorption peak, the complex do es not have an absorption peak at the hydroxyl group of 3 140cm^-1 corres ponding to the ligand, and the absorption waveforms of the three ligands and complexes are similar, and the structure of the ligand and the complex are reacted basically consistent. However, the absorption peaks between the ligand and the complex have a large difference, and it can be inferred that the ligand has been coordinated. The fluorescence properties of the complexes were determined by fluorescence spectrophotometer. The effects of ligand substituents on the fluorescence intensity were discussed. The complexes can be excited by 470nm blue light and have good red light emission at 608~617 nm. Such phosphors are expected to be applied on OLEDs.