1 淮阴师范学院，淮安 223300
2 江苏省现代检测技术与智能系统重点建设实验室，淮安 223300
采用高温固相法制备了SrAl2Si2O8∶Eu2+(SASO∶Eu2+)系列荧光粉，详细研究了荧光粉的晶体结构、激发光谱、发射光谱以及热稳定性。结果表明,在337 nm激发下，发射光谱为一个非对称的宽带单峰，峰值波长404 nm，峰的半高宽约为53 nm，Eu2+的最佳掺杂摩尔浓度为5%，根据Dexter理论，讨论了SASO∶Eu2+荧光粉浓度猝灭是由于Eu2+电偶极-电偶极之间的相互作用引起的。当加热到225 ℃时，SASO∶0.05Eu2+荧光粉发光强度仍具有在初始室温下发光强度的97.4%，表明其具有优异的热稳定性。
SrAl2Si2O8∶Eu2+荧光粉 高温固相法 发光性能 热稳定性 SrAl2Si2O8∶Eu2+ phosphor high temperature solid-state method luminescent property thermal stability
Author Affiliations
Abstract
1 School of Physics and Electronic Electrical Engineering, Huaiyin Normal University, Huaian 223001, China
2 School of Science, Nanjing University of Science and Technology, Nanjing 210094, China
The apatite compound Ca4La6(SiO4)4(PO4)2O2 (CLSPO) was explored as the host material for phosphors used in white light-emitting diodes (wLEDs). The crystal structure of the CLSPO host prepared by the solid-state reaction method was investigated with Rietveld refinement. The rare earth ions (Eu3+/ Tb3+/Ce3+, Tb3+/Tb3+, Mn2+) activated CLSPO phosphors were synthesized, and their photoluminescence properties, quantum yields, as well as thermal stabilities, were studied. Under near-ultraviolet excitations, the Eu3+ and Tb3+-doped CLSPO compounds exhibited red and green emissions with high luminescence efficiencies. Besides, tunable emissions from green to orange were obtained by introducing Mn2+ ions into the Tb3+-doped CLSPO samples. The results showed that the phosphors studied may have potential applications for wLEDs.
160.4760 Optical properties 230.3670 Light-emitting diodes 300.6170 Spectra Chinese Optics Letters
2019, 17(5): 051602
Author Affiliations
Abstract
1 School of Science, Nanjing University of Science and Technology, Nanjing 210094, China
2 School of Physics and Electronic Electrical Engineering, Huaiyin Normal University, Huai’an 223001, China
A series of RE3+ (RE=Eu/Tb/Ce)-activated Sr4La(PO4)3O (SLPO) phosphors are synthesized with a high-temperature solid-state reaction method. The photoluminescence properties, thermal stability, morphology, and CIE values of the SLPO:Eu3+/Tb3+/Ce3+ phosphors are investigated. Under 394 nm excitation, the SLPO:Eu3+ exhibits red emission, and the SLPO:Tb3+ presents a green emission upon 379 nm excitation, while Ce3+-doped SLPO has a broad emission band ranging from 370 to 650 nm under 337 nm excitation. The investigation results indicate that the SLPO:Eu3+/Tb3+/Ce3+ phosphors can be effectively excited by near-ultraviolet light and may have the potential to serve as red-, green-, and blue-emitting phosphors for applications in white light-emitting diodes.
160.4760 Optical properties 230.3670 Light-emitting diodes Chinese Optics Letters
2017, 15(12): 121602
1 南京理工大学近程高速目标探测技术国防重点学科实验室, 江苏 南京 210094
2 淮阴师范学院江苏省现代检测技术与智能系统重点建设实验室, 江苏 淮安 223300
针对传统的采用发散照明的相位测量轮廓术投影到参考面上的光场产生畸变的情况, 提出一种利用逆推法从参考面上的位置坐标与光栅条纹坐标分布之间的映射关系建立投影光栅模型的方法, 确保校正光栅投影到参考面上的条纹满足周期性分布。通过相位-高度映射关系恢复出被测物体的面形分布。该方法无须像传统测量方法一样将相位-高度之间的映射关系以数据表形式存储在计算机中, 放宽了系统测量的约束条件, 简化了测量装置, 并能实现高精度测量。计算机模拟和实验均证实了该方法的有效性。
测量 三维测量 光栅投影 相位测量轮廓术 逆推法 激光与光电子学进展
2017, 54(1): 011202
淮阴师范学院 物理与电子电气工程学院, 江苏 淮安 223300
基于椭圆形光强分布光栅投影测量物体三维面形的方法, 将椭圆形光强分布光栅投影到被测物体表面, 用摄像机获取变形条纹图, 通过系统参量和条纹图携带的相位信息求解出物体的三维面形.推导出通过椭圆形光强分布光栅条纹求解相位的计算公式并对提出方法作了计算机仿真.实验结果表明该方法可以比较准确地测量物体的三维面形,在噪音较大的情况下测量结果仍具有较高准确度.
三维测量 椭圆形光强分布光栅 条纹分析 相位展开 3D measurement Elliptic pattern grating Fringe analysis Phase unwrap
为了研究二元误差扩散算法，采用计算机仿真的方法产生光栅模板用于位相测量轮廓术，分析误差扩散点数和误差分配系数对编码方法和测量精度的影响。结果表明，应用3种常见的误差分配系数用于产生正弦光场都具有较高的测量精度，三者间没有显著性差异。误差扩散点数对编码方法和相位测量精度的影响较小。实验证明，采用误差扩散编码后，系统综合误差可以控制在1%的等效波长以内，验证了二元误差扩散方法的可行性与精确性。
衍射光栅 位相测量轮廓术 二元编码 误差扩散算法 diffraction gratings phase-measuring profilometry binary encode error diffusion algorithm
