微波辅助共沉淀法制备SrCO_3∶Eu^(3+)红色荧光粉  

Preparation of SrCO_3∶Eu^(3+) Red Phosphor Powders by Microwave Assisted Co-precipitation Method

作　　者：燕文清[1] 康明[1] 刘军[1,2] 孙蓉[1] 刘君玉[1] 

机构地区：[1]西南科技大学材料科学与工程学院,绵阳621010 [2]海洋王照明科技股份有限公司,深圳518052

出　　处：《人工晶体学报》2010年第4期1049-1054,共6页Journal of Synthetic Crystals

基　　金：四川省重点实验室基金(08zxxp10);西南科技大学研究生创新基金(09ycjj15)

摘　　要：采用微波辅助共沉淀法制备SrCO3∶Eu3+红色荧光粉,并利用XRD、SEM和PL-PLE分别对样品SrCO3∶Eu3+的物相、形貌和发光性能进行表征。研究了激发波长以及Eu3+浓度对样品发光性能的影响。结果表明,掺杂Eu3+作为红色发光中心进入到文石型碳酸锶晶格中占据非中心对称的格位。不论是以284nm为中心的Eu3+-O2-电荷迁移带跃迁激发,还是以393nm、464nm的f-f跃迁激发,样品的发射光谱均以614nm为主,对应于Eu3+的电偶极跃迁5D0→7F2,属于红色发光。随着Eu3+掺杂浓度的增大,发光强度先增加后减小,其中在284nm激发下的猝灭浓度为3mol%;在393nm和464nm激发下的猝灭浓度为12mol%。根据Dexter理论,样品的浓度猝灭机理为电偶极-偶极跃迁。这种红色荧光粉SrCO3∶Eu3+有望应用于荧光灯和白光LED领域。Eu3＋ -doped strontium carbonate phosphor was synthesized by microwave assisted co-precipitation method. The structure,morphology and spectrum properties were characterized by X-ray diffraction（ XRD） ,scanning electron microscopy （ SEM） and photoluminescence and photoluminescence excitation（ PL-PLE） spectrum,respectively. The effect of excitation wavelength and Eu3 ＋ concentration on the luminescence properties were studied. The results reveal that Eu3 ＋ acted as a luminescent center probe into the single orthorhombic phase SrCO3 located in an asymmetric position. The PLE spectrum shows a broadband absorption center in 284 nm,which belongs to Eu3 ＋ -O2 -charge transfer transition,and several series of narrow peaks at 393 nm and 464 nm,and so on,which belonged to f-f transition. The sample is the pure red phosphor since the maximum emission peak locate in the vicinity of 614 nm,corresponding to the transition of 5D0 →7F2. The luminescent intensities increase as Eu3 ＋ concentration increasing,and then decrease because of concentration quenching. The optimal concentration of Eu3 ＋ was 3 mol% excitate at 284 nm,while 12 mol% excitate at 393 nm or 464 nm. The concentration self-quenching mechanism is the dipole-dipole interaction according to the Dexter theory. In addition,the SrCO3∶ Eu3 ＋ red phosphor powders would have the great potential application for fluorescent lamp and LED fields.

关 键 词：SrCO3∶Eu3+ 白光LED 微波辅助 红色荧光粉 

分 类 号：TB34[一般工业技术—材料科学与工程]