欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
采用高温固相法制备了Sr3SiO5∶Eu^2＋黄色发光材料,研究了Eu^2＋浓度及共激活剂等对材料发光性能的影响。结果显示,随Eu2＋浓度的增大,Sr3SiO5∶Eu^2＋材料发射强度先增强后减弱,即存在浓度猝灭效应,根据Dexter理论,其浓度猝灭机理为电偶极-偶极相互作用。掺入共激活剂Yb、Tm均能提高材料的发射强度。利用InGaN管芯分别激发Sr2.98Eu0.01Tm0.01SiO5和Sr2.98Eu0.01Yb0.01SiO5材料,获得了很好的白光发射。
英文摘要：
Sr3SiO5： Eu^2＋ phosphors were synthesized by high temperature solid state reaction. The starting materials are the analytic reagents SrCO3, SiO2, Eu2O3. After the individual materials were mixed in the requisite proportions sufficiently, the powders were calcined at 1 300 ℃ for 6 h under the ambience of 5% H2 in N2 to reduce Eu^3＋ to Eu^2＋ The structure was checked by powder X-ray diffraction （XRD, D/max-rA, Cu Kct, 40 kV, 100 mA）. The excitation and emission spectra are measured by a Shimadzu RF-540 fluorescence spectrophotometer. All the photoluminescence properties of the phosphors were measured at room temperature. The obtained products are Sr3 SiO5： Eu^2＋ phosphors. Effect of Eu^2＋ concentration and co-doping activation on the luminescence characteristics of Sr3 SiO5： Eu^2＋ phosphors was investigated. The results showed that the emission intensities of Sr3SiO5： Eu^2＋ phosphors firstly increase with increasing Eu^2＋ concentration, and then decrease because of concentration quenching. They reach a maximum at 1% Eu^2＋ , and the concentration self-quenching mechanism is the d-d interaction according to the Dexter theory. Moreover, the emission intensities can be enhanced by co-doping rare earth ions, such as Tm^3＋ and Yb^3＋. The relative spectra of InGaN-based Sr2.95 Eu0. 01 Tm0.01 SiO5, Sr2.98 Euo.ol Yb0.01 SiO5 or YAG： Ce phosphors were measured. Because Sr3 SiO5 ： Eu^2＋ phosphor has longer emission wavelength than YAG： Ce, so the color rendering property of InGaN-based Sr2.98- Eu0.01Tm0.01 SiO5 or Sr2.98 Eu0.01 Yb0.01 SiO5 is better than that of InGaN-based YAG： Ce. In conclusions, Sr3 SiO5： Eu^2＋ phosphor is a promising yellow phosphor for white LED manufacture.
同期刊论文项目
同项目期刊论文
Sr2B2P2O10:Eu2+,Mn2+,Ba2+: A Potential Single-Phase White Light-Emitting Phosphor for UV Light Emitt
SrIn2O4:Eu3+, Sm3+: A Red Emitting Phosphor with a Broadened Near-Ultraviolet Absorption Band for So
Energy Transfer from Ce3+ to Eu2+ in LiSrBO3 and Its Potential Application in UV-LED-Based White LED
期刊信息
位置：