Synthesis And Luminescence Property Of Polymer Phosphors Containing Zn-Eu In White Light Emitting Diode

The white light emitting diode(WLED) has attracted the attention owing toits superior characteristics than the traditional light source. At present, thetechnology to obtain white light by stimulating tricolor phosphor is widelyresearched and used. Because of the high excitation energy, the blue light oftricolor is difficult to be synthesized. Using the problem as the entry point, thissubject is to develop efficient blue phosphor. Firstly, a technical route fromcoordinate to polymerization was used to synthesize blue light phosphor, andthen other composition was introduced in through the solution polymerizationto obtain white light:(1)A kind of reactive zinc complex2-(2-hydroxy phenyl) benzothiazole-methacrylic acid-Zn((Zn(BTZ)(MAA)) was synthesized empolying Zn2+as thecenter of metal ion,2-(2-hydroxy phenyl) benzothiazole as the first ligand andmethacrylic acid as active ligand. The structure and properties of the complexwere characterized by IR, UV, fluorescence spectra and TG analysis. The resultsindicate that the complex emit blue-green light at473nm being excited by thewavelength of365nm. The color coordinate of the complex is calculated at(0.145,0.139). The thermal decomposition temperature of the complex is289oC,and its thermodynamics properity is stable. (2) In the solution polymerization, St-co-Zn(BTZ)(MAA) wascopolymerized by Zn(BTZ)(MAA) and styrene. The structure and luminescenceproperties of the polymer were characterized by IR, UV, fluorescence spectraand TG analysis. The results of the IR and UV indicate that the copolymermainly exhibit the absorption from polystyrene, and also the absorption from thecomplex. The fluorescence spectra showed that the polymer St-co-Zn(BTZ)(MAA) emit blue light at451nm being excited by the wavelength of395nm. The color coordinate of the polymer is calculated at (0.145,0.139).The thermal decomposition temperature of the polymer is297oC, and itsthermodynamics properity is excellent.(3)The phospher of Zn-Eu in white LED was copolymerized bystyrene,Zn(BTZ)(MAA) emitting blue-green light and Eu(TTA)2(MAA)emitting red light in the solution. The results of the IR indicate that reactionshas happened between the two kinds of complex and the polymer, and formednew chemistry bond. The fluorescence spectra showe that the polymer emitblue light at459,512,613nm being monitored by the wavelength of365nm,and the emission peaks at459nm and512nm come from the complex of Zn,the sharp emission peak at613nm is attributed by the transition of5D0â†'7F1/5D0â†'7F2of Eu3+that supplied by complex of Eu. The color coordinate of thepolymer is calculated at (0.275，0.295). The polymer keep stable at329oC,meeting the temperature requirements of LED.