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为开发出等离子显示屏用新型红色荧光体,研究了GdAl3(BO3)4∶Eu,Gd2SiO5∶Eu的紫外和真空紫外发光特性。在147nm激发下GdAl3(BO3)4∶Eu3+呈色坐标为(0.645,0 330)的强红光发射,说明是非常有前途的PDP用红色发光材料。在GdAl3(BO3)4∶Eu3+的激发光谱中,除观察到Eu3+的电荷迁移带(峰值位于258nm)外,还观察到峰值位于155nm的宽带。依据硼酸盐的吸收数据将其归属于BO3基团的吸收。另外观察到Gd3+8S7/2→6I11/2跃迁(274nm)及在真空紫外(158～160nm)激发下,Eu3+的红光发射强度随着Eu3+浓度的增加而减弱,说明BO3基团吸收的能量经Gd3+为媒介转移到Eu3+。分析Gd2SiO5∶Eu的激发光谱,得到Eu3+的电荷迁移带是峰值位于256nm的宽带,峰值位于183nm的宽带可能是Gd3+的电荷迁移带。在256nm激发下Gd2SiO5∶Eu3+呈强红光发射,但是147nm激发下很弱。这是由于真空紫外激发效率低的原因,其特点可由其晶体结构即激活离子所处的环境解释。
In order to develop new red phosphors for plasma displays, the UV and VUV luminescence properties of GdAl3 (BO3) 4Eu, Gd2SiO5:Eu were studied. The strong red emission of GdAl3 (BO3) 4Eu3 + with a color coordinate of (0.645,0330) under 147 nm excitation shows that it is a very promising red emitting material for PDP. In the excitation spectrum of GdAl3 (BO3) 4Eu3 +, in addition to the charge transport band of Eu3 + (peak at 258 nm), a broad band with a peak at 155 nm was observed. It is attributed to the absorption of BO3 groups based on the absorption data of borates. In addition, it was also observed that the emission intensity of Eu3 + decreases with the increase of Eu3 + concentration under the excitation of Gd3 + 8S7 / 2 → 6I11 / 2 (274nm) and under vacuum ultraviolet (158 ~ 160nm) Transfer to Eu3 + via Gd3 +. The excitation spectrum of Gd2SiO5: Eu was analyzed to find that the charge transfer band of Eu3 + is the peak at 256nm, and the peak at 183nm may be the charge transfer band of Gd3 +. Gd2SiO5: Eu3 + showed strong red emission at 256 nm excitation, but very weak at 147 nm excitation. This is due to the low efficiency of vacuum UV excitation, which can be explained by its crystal structure, the environment in which the activating ions are located.