微波法合成红色荧光粉CaCO_3:Eu^(3+)  

Synthesis of the CaCO_3:Eu^(3+)Red Phosphor by Microwave Method

作　　者：康明[1,2] 刘军[1] 孙蓉[1] 尹光福[2] 王兴明[1] 燕文清[1] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]四川大学材料科学与工程学院,四川成都610065

出　　处：《光谱学与光谱分析》2010年第1期225-229,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(10476024);四川省重点实验室项目(08ZXXP10);四川省科技厅项目(2006J13-059)资助

摘　　要：采用微波法合成了红色荧光粉CaCO_3:Eu^(3+)。通过SEM,XRD和PL-PLE光谱等对样品的性能进行了表征和分析。同时,研究了微波功率对样品发光性能的影响。结果表明:样品在不同功率下会生成球霰石型的花片状、方解石型的立方体和文石型的针状等不同晶型的碳酸钙,颗粒的分散性好。波谱分析说明,掺杂Eu^(3+)作为发光中心进入到CaCO_3晶格中,其激发光谱主要由200～300 nm的Eu^(3+)—O^(2-)电荷迁移跃迁形成,属于宽带激发,在319,395,465,535 nm等处有窄的激发峰出现。在发射光谱中,由于磁偶极跃迁~5D_0→~7F_1受到不同晶体场的作用而分裂为593和589 nm两个峰,最强的发射峰为614 nm,对应于Eu^(3+)的电偶极跃迁~5D_0→~7F_2,属于纯正的红色发光。此外,随着微波功率的提高,基质的晶型逐渐由花片状的球霰石向针状的文石型过渡,样品的红色发射强度也逐渐增强。The red phosphor of CaCO3 doped with Eu^3＋ was synthesized with the microwave method in the aqueous solution and characterized with electron microscope （SEM）, X-ray diffraction （XRD）, and photoluminescence and photoluminescence excitation （PL-PLE） spectrum. Also under investigation was the influence of microwave power on luminescence properties. The results showed that the synthesized CaCOa ： Eu^3＋ particles were the mixture of various particles in the forms of vaterite with flow er-flake, calcite with cubic shape and aragonite with needle-like, which were evenly dispersed. The Eu^3＋ ion as the luminescent center inhabited the site of Ca^2＋ in mixed phases of CaCO3 ： Eu^3＋. This feature was mainly characterized by the intense charge transfer band range from 200 to 300 nm in the PLE spectrum, which was the wide band excitation. Moreover, the narrow excitation peaks at 319, 395, 465, 535 nm and so on could be detected in the PLE spectrum. For the mixed phase, the magnetic-dipole transition ^5Do to 7F1 emission was split into two sublevels at about 589 and 593 nm by the crystal field. The mainly emission peaks were located in the vicinity of 614 and 620 nm, corresponding to the electric dipole transition ^5Do→^7F2 of Eu^3＋ ions that was the pure red emission. Moreover, with the improvement of the microwave power, the emission intensity was on rise for themorphology and phase of the sample changed from the flower-flake vaterite to the needle-like aragonite, coupled with the intensi ty of red light emission.

关 键 词：CaCO_3:Eu^3+ 微波合成 红色 发光材料 

分 类 号：O482.3[理学—固体物理] O614.2[理学—物理]