稀土Tb^(3+),Eu^(3+)对N-苯基邻氨基苯甲酸及邻菲咯啉间能量传递与蓝色发射的强化作用

Intensification of Rare Earth Ions Tb^(3+),Eu^(3+) for the Blue Emitting and Energy Transferring between N-phenylanthranilic Acid and 1,10-phenanthroline

合成了一种由稀土离子与N 苯基邻氨基苯甲酸(N HPA)和邻菲咯啉(phen)形成的蓝色发光配合物。该配合物是典型的配体发光配合物,其发射峰位于444nm,激发波长为334nm和407nm。元素分析、红外光谱、紫外 可见光谱和差热 热重的分析结果表明:配合物中含有大量的N HPA和相对较少的稀土离子和phen,其中稀土离子与N PA中的羧酸根配位,而N PA中的氨基通过氢键与phen的氮原子结合,形成了有利于配体之间的能量传递和电子转移的通道。稀土离子Tb3+,Eu3+的共同存在促进了这一能量转移通道的形成,进而强化了配体的蓝色发射。

A great number of rare earth (Tb3+,Eu3+) complexes with aromatic ca rboxylic aci d, βdiketone and phen etc. organic ligands have been synthesized, and the ir exc ellent luminescence properties have been used as luminescence materials and prob e in the chemical and biological molecular systems. Very recently, a 10 candela  class white LED composed of a multiple quantum well InGaN blue lightemitting d i ode (LED) and a YAG∶Ce phosphor has been developed.The white light is obtained b y the integration of the blue InGaN LED die and the YAG phosphor into a sing le p ackage. Several approaches are available to manufacture white LEDs, the thinking at several companies is that a violet or nearUV LED plus RGB phosphors will b e the best overall method to make a white LED. In order to prepare high efficienc y phosphorbased LED for general lighting, it is necessary to find some suitabl e phosphors for this purpose. In the present paper, a novel blue emission com plex of rare earth ions Tb3+,Eu3+ with Nphenylanthranilic acid and 1,10phenanthro line was synthesized and characterized by luminescence spectra, IR spectra, UV v is absorption spectra, DTATG and element analysis. It was found that the complex is a typ ical ligand emitting complex, which possess a strong emission spectra with peak wavelength lying at 444nm, and a wide excitation spectra with two adjace nt pe aks at wavelengths 337nm and 407nm.This means that the synthesized blue phosphor can be used for the assembler of a new kind of blue LED. Results from the IR, U Vvis absorption spectra,DTATG and element analysis show that the comple x contained a grea t of NPA and a little of rare earth as well as phen, the rare earth ions c oordi nated with carboxyl group, and the azyl of NPA link with phen through the nitro gen atom by the formation of hydrogen bond, which composes a good channel for th e energy and electrons transmitting between ligands. The coexistence of r are ea rth ions(Tb3+,Eu3+) will enhance the formation of this channel and then intensify the ligands' blue emission.