Synthesis, Photoluminescent And Electroluminescence Properties Studies Of Phenol-pyrimidine And Pyridyl-imidazole Complexes

Organic electroluminescent has made great progress with thedevelopment of organic thin film science and technology. Organic electroluminescent devices, which are also called organic light emitting diodes (OLEDs), were fabricated with organic electroluminescent materials between a metal cathode and a transparent anode, and emitting light under a certain voltage applied on electrodes. OLEDs are of growing interest in various displays application because of their active lighting, lower power, gently weight, higher luminous efficiency and lower cost than other flat panel displays.The final destination of OLEDs' research is dynamic display with various colors, in which three basic colors must be needed (red, green and blue). Up to now, some materials with photoelectric properties which can generate green and red light have been found, but excellent materials which can emit blue light are rare. This is because the high energy gap, which blue light materials have, prevents the access of electrons from cathode. Thus there will be a contradiction between the high energy gap and the infusion of electrons. So the developments of the materials which can generate blue light are confined greatly. Hence seek for excellent blue-light emitting materials are very important for their infrequence not only in basic theory but also in application of devices.Here, we report the synthesis of a bidentate, conjugate and heterocyclic organic ligand, which both have phenolate and imine groups, from the Viewpoint of molecular design, and electron withdrawing (-N=) group is introduced at the 3 position of the imino ring to enlarge the energy gap. The Complex of Be( II), Zn( II )and Cd( II) are gotten and the solid fluorescence spectra show they are blue-light emitting materials, with the photoluminescence peaks occur at 424 nm, 461 run, 438nm, and the half wave widih are 50nm, 66 nm, 61 nm, respectively.Orgafu'c metal complex both has high fluorescence quantum yield as organic compound and excellent stability as inorganic compound. So it is deemed as the most promising candidate for applicable luminescent materials. The select of organic ligand is very important due to luminescent properties) of the complex depend on properties of the ligand. A novel blue-light)emitting organic compound 4,6-di(2-pyridyl)-2-pyrimidineamine was selected and several complexes with Be( II), Mg( II), Zn( II), Cd( II) were synthesized and both the solid and liquid fluorescence spectra show they are blue-light Emitting materials, with the melt point higher than 300 cent degree. So they are sijiitable to be luminescent materials.Recently, there have been a number of studies on boron compounds for greatejr stability and excellent blue-light emitting properties. Here a novel bortm compound with 2-(2-pyridyl) imidazole was synthesized and the fluorescence spectrum shows it is a potential blue-light emitting material.