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    • 52. 发明申请
    • Two-phase thermal method for preparation of cadmium sulfide quantum dots
    • 用于制备硫化镉量子点的两相热法
    • US20070004183A1
    • 2007-01-04
    • US11158111
    • 2005-06-21
    • Qiang WangDaocheng PanXiangling JiShichun JiangLijia An
    • Qiang WangDaocheng PanXiangling JiShichun JiangLijia An
    • H01L21/20
    • H01L21/02628B82Y10/00C23C18/1204C23C18/1283H01L21/02557H01L21/0259
    • The present invention relates to a two-phase thermal method for the preparation of cadmium sulfide quantum dots. In the method, cadmium carboxylate containing 2 to 18 carbon atoms or cadmium oxide is selected as cadmium source; thiourea or thioacetamide is selected as sulfur source; oleic acid or trioctylphosphine oxide (TOPO) is selected as capping agent, and molar ratio of cadmium source to sulfur source is in a range of from 10:1 to 1:10, and molar ratio of cadmium source to capping agent is in a range of from 1:7 to 1:25. Water and water-insoluble organic compound in equal or similar volume are used as solvents forming a two-phase system. The mixture is heated at 120-180° C. in an autoclave for 0.5 to 24 hrs. By means of varying reaction time, cadmium sulfide quantum dots of different sizes could be prepared. Alternatively, it is also feasible to use quantum dots already obtained as crystal seeds in the reaction of newly added reaction precursor to give larger sized quantum dots with a size distribution similar to that of the initial crystal seeds so as to realize the control of quantum dot size. The quantum dots obtained in the present invention have relatively narrow size distribution, emit royal purple or blue light under ultraviolet lamp, with a photoluminescence quantum efficiency of from 3 to 60%.
    • 本发明涉及制备硫化镉量子点的两相热法。 在该方法中,选择含有2〜18个碳原子的镉或氧化镉作为镉源; 选择硫脲或硫代乙酰胺作为硫源; 选择油酸或三辛基氧化膦(TOPO)作为封端剂,镉源与硫源的摩尔比在10:1至1:10的范围内,镉源与封端剂的摩尔比在一定范围内 为1:7至1:25。 使用相同或相似体积的水和水不溶性有机化合物作为形成两相体系的溶剂。 将混合物在高压釜中在120-180℃下加热0.5至24小时。 通过改变反应时间,可以制备不同尺寸的硫化镉量子点。 或者,在新添加的反应前体的反应中,使用已经作为晶体种子获得的量子点,得到尺寸分布与初始晶种类似的大尺寸量子点也是可行的,以实现量子点的控制 尺寸。 在本发明中获得的量子点具有相对较窄的尺寸分布,在紫外灯下发射紫外或蓝光,光致发光量子效率为3至60%。
    • 55. 发明申请
    • Maze pattern analysis
    • 迷宫模式分析
    • US20060045307A1
    • 2006-03-02
    • US10932803
    • 2004-09-02
    • Liyong ChenYingnong DangXiaoxu MaJian WangQiang Wang
    • Liyong ChenYingnong DangXiaoxu MaJian WangQiang Wang
    • G06K9/00
    • G06F3/0321G06F3/03545G06T7/80H04N1/32208H04N2201/3269
    • Processes and apparatuses analyze an image of maze pattern in order to extract bits encoded in the maze pattern. Grid lines of a maze pattern are determined. Directions for effective pixels of associated bars are estimated and are grouped into clusters. Lines are estimated for selected effective pixels of a selected cluster that is associated with a first principal direction. Grid lines of another cluster are determined, where the other cluster is associated with a second principal direction that is perpendicular with the first principal direction. Estimated lines are pruned based on slope variation analysis, grouped based on a distance analysis, and a best fit line is selected from each group. Affine parameters are determined from best fit lines. The correct orientation of a maze pattern is obtained by determining a type of missing corner of the maze pattern. Bits are extracted from the image of maze pattern by processing gray level values of the associated maze pattern cells.
    • 过程和设备分析迷宫图案的图像,以便提取在迷宫图案中编码的比特。 确定迷宫图案的网格线。 估计关联条的有效像素的方向,并将其分组成簇。 对于与第一主方向相关联的所选择的集群的所选有效像素估计行。 确定另一个簇的网格线,其中另一个簇与与第一主方向垂直的第二主方向相关联。 基于斜率变化分析修剪估计行,根据距离分析进行分组,并从每组中选择最佳拟合线。 仿射参数由最佳拟合线确定。 通过确定迷宫图案的缺失角落的类型,可以获得迷宫图案的正确方向。 通过处理相关联的迷宫图案单元的灰度值,从迷宫图案的图像中提取位。