Thermal stability of luminous YAG: Ce bulk ceramic as a remote phosphor prepared through silica-stab

来源 :OptoelectronicsLetters | 被引量 : 0次 | 上传用户:wjt197703
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
A prototype of YAG: Ce (Y3Al5O12) luminous bulk ceramic as a remote phosphor for white LED illumination was fabricated in air through a strategy of silica addition. With increasing the amount of silica in a specific range, the opaque sample turns to be semi-transparent. The precipitation of crystals is verified to be in pure YAG phase by X-ray diffraction (XRD). Beyond the limit of silica amount, the dominant phase of YAG crystal is found to coexist with a small amount of newly-formed Y2Si2O7, Al2O3 and the amorphous phase. The YAG crystals are with a grain size of approximately 2 μm and distribute evenly. The YAG hosts after structural modification via addition of silica result in yellow band emission of 5d-
其他文献
提出一种基于低复杂度Levenberg-Marquarat的光纤波长解调光谱峰值定位算法, 该算法相对于现有的功率加权算法和高斯-多项式拟合算法, 具有高精度定位光谱峰值的优点, 实验结果表明, 在高性噪比情况下, 采用基于低复杂度Levenberg-Marquarat的峰值定位算法可以有效地抵制噪声提高解调精度, 将光纤波长解调误差控制在1pm内。通过简化后的数据处理过程, 可以满足高速解调的要求, 便于在数字电路上实现。
期刊
In order to improve the accuracy and universality of the rotational speed measurement, an instantaneous rotational speed measurement method based on laser Doppler technology is proposed. The composition and working principle of the new system are discusse
Fluorescent porous silicon was prepared as a stable biosensor chip substrate. The aminopropyltriethoxysilane (APTES) molecules are attached in the pores of the porous silicon with a crosslink method, and when the molecules are added into the chip, the flu
期刊
Using the time-dependent theory, we calculate the random-laser emission spectra in a two-dimensional strongly disordered medium. The calculation results show that in low dimensional systems, such as thinfilm disordered media and planar waveguides, the lar
河流是遥感图像中一种非常典型且重要的地理目标,对河流的自动检测在水资源调查及水利规划等方面有重大意义。在此提出了一种基于多特征融合和软投票方法的河流目标检测算法,该算法首先将图像分割成胞元,提取胞元的局部熵、纹理、光谱和颜色等特征,利用随机森林训练和分类,并利用基于形态学运算结合多判据投票法优化机器学习的粗检测结果,对优化后的粗检测结果利用水平集活动轮廓逼近河岸线。实验表明,该算法检测效果良好,对
采用多通道量子数亏损理论与K反应矩阵相结合的理论处理方法,研究了高l组态3plm、(l=4)对于镁原子3pnd(J=3)自电离光谱的影响.在处理中引入3png(J=3)组态的影响后能够完整地描述3ppnd(J=3)自电离光谱.通过对自电离光谱的细微结构的研究,讨论了有关的实验现象的物理机制.理论结果与实验一致.
为研究ZnWO4晶体的二阶拉曼性质,搭建了基于ZnWO4晶体的二阶拉曼激光器,实现了重复频率为9 kHz的670 mW的1318.3 nm的二阶斯托克斯激光输出,对应的脉宽为3.294 ns,光光转换率为4.7%,峰值功率达到22.6 kW。实验结果表明,ZnWO4晶体具有良好的性能,能够实现二阶拉曼激光输出。
本文用两种波长不同的激光——Ar 激光和CO2激光,对以石英为衬底的a-Si SOI进行了激光结晶。两者的结晶机理不同,得到了不同的结晶形貌。
人脸识别技术易受光照、表情等因素影响,为充分提取人脸特征信息,提出了融合改进的局部二值模式(LBP)和梯度方向直方图(HOG)方法提取人脸图形纹理、细节特征,利用列方向压缩的2DPCA+PCA算法对人脸的特征空间进行降维处理,使用2DPCA算法降低了特征维度,解决了仅仅使用PCA方法,由于人脸图像特征维度高而造成求解模型复杂的问题,降低了计算规模,提高了运算速度。最后,使用ORL和Yale人脸数据