Synthesis And Luminescent Properties Of Ba₂Gd₂Si₄O₁₃:Re Phsophors For White Leds

As the fourth-generation light source, white LED process many advantages, such as high efficiency, long lifetime, fast response, and environment-friendly characteristics. The design and fabrication of phosphors used for white LED have been paid more attention with the extension of application field and the development of elaboration technology of white LED. The most mature way to achieve white LED is the phosphor-converted method. Thus, the investigation of phosphors used for white LED was widely studied. Herein, rare earth ions doped Ba2Gd2Si4O13phosphors were firstly elaborated and characterized.1. A red phosphor Ba2Gd2Si4O13:Eu3+for white LED: to find out efficient red phosphors used for white light-emitting diodes (LEDs), a new Ba2Gd2Si4O13:Eu3+phosphor was prepared by conventional solid-state reaction method. The effect of Li2CO3flux and Eu3+doping concentrations on structural and luminescent properties of Ba2Gd2Si4O13phosphors was studied in detail. The phosphors show intense absorption in near ultraviolet-blue region and exhibit intense red emissions with CIE coordinates of (x=0.66, y=0.34) under393nm excitation. The integrated emission intensity of Ba2(Gdo.4Euo.6)2Si4013excited by393nm,362nm and464nm is about3.5,4.0and3.1times as that of Y2O3:Eu3+commercial phosphors, respectively. The excellent luminescent properties and good color saturation make it a promising red phosphor for white LEDs.2. A single-phased phosphor Ba2Gd2Si4O13:Ce3+,Tb3+for white LED:the novel Ba2Gd2Si4O13:Ce3+,Tb3+phosphors were systemically investigated by fluorescent method for the first time. Through an efficient energy transfer process, the obtained phosphors exhibit both a blue emission of Ce3+and a yellowish green emission of Tb3+with considerable intensity under near-ultraviolet excitation (300-370nm). Tuning the content of Tb3+can generate the varied hues from blue to white and eventually to yellowish green. The quantum efficiency of the white phosphor Ba2(Gd0.88Ce0.02Tb0.1)2Si4O13is82.3%of commercial ZnS:Ag+,Cl-phosphor. Our results demonstrate that the potential application of these phosphors in solid-state lighting and (or) other areas.3、The last part of this paper briefly introduces two other work of myself: electrospinning synthesis and luminescent properties of Lu2O3:Eu3+nanofibers; efficient visible to near-infrared energy transfer in Ce3+-Yb3+co-doped Y2SiO5phosphors.Finally, we provide a summary of the main points covered.