纳米CaO ∶ Eu3+的制备及发光性质

利用共沉淀法制备了纳米CaO : Eu³⁺发光粉体。并对不同掺杂浓度和不同煅烧温度下所制备的CaO : Eu³⁺粉体进行室温发光性质的研究。在室温下观测到CaO : Eu³⁺样品具有较强的Eu³⁺离子特征发射。通过对不同煅烧温度下样品发射谱的对比,发现样品在591 nm和610 nm处的发射峰积分强度比随着煅烧温度的升高而降低,说明在不同的煅烧温度下,Eu³⁺占据了两种不同的格位。对样品强发射峰进行监测,可观测到样品中的O^2-和Eu³⁺离子之间形成的电荷迁移态。通过对比不同掺杂浓度下Eu³⁺离子发射光谱,发现将Eu³⁺掺杂到CaO基质中的适宜浓度为4%。

Preparation and Luminescent Properties of Nano Crystal CaO:Eu3+

The nanocrystal CaO : Eu3+ powders were prepared by co-precipitation method in this paper. Luminescent properties of CaO : Eu3+ with different sintering temperatures and dopant concentrations were studied. The results indicated that the samples have sharp characteristic emissions spectra of Eu3+. With the comparison of emission spectra of CaO : Eu3+ annealed at different temperatures, the integral intensity ratio of the peaks between 591 nm and 610 nm is found to decline with the temperature increasing. It was revealed that the rare earth ions (Eu3+) occupy different lattice position in the samples with different sintering temperatures. The change transfer state was observed between O2- and the rare earth Eu3+ ion.The effect of the doped Eu3+ concentration on the fluorescence emission intensity was discussed, and the results showed the concentration quenching depends on the doped Eu3+ concentration. The optimum dopant concentration for the luminescence of Eu3+ is determined to be 0.4%.