公开(公告)号：US06300640B1

公开(公告)日：2001-10-09

申请号：US09197248

申请日：1998-11-20

申请人： Rameshwar Nath Bhargava ,  Nikhil R. Taskar ,  Vishal Chhabra ,  John Victor D. Veliadis

发明人： Rameshwar Nath Bhargava ,  Nikhil R. Taskar ,  Vishal Chhabra ,  John Victor D. Veliadis

IPC分类号： G01T120

CPC分类号： G01T1/20 ,  G21K2004/06 ,  G21K2004/12

摘要： A composite phosphor screen for converting radiation, such as X-rays, into visible light. The screen includes a planar surface, which can be formed from glass, silicon or metal, which has etched therein a multiplicity of closely spaced microchannels having diameters of the order of 10 microns or less. Deposited within each of the microchannels is a multiplicity of phosphors which emit light when acted upon by radiation. The walls of the microchannels and/or the substrate surfaces include light reflective coatings so as to reflect the light emitted by the phosphors to the light collecting devices, such as film or an electronic detector. The coatings can be either radiation transparent or filtering/attenuating depending on the particular application.

摘要翻译： 用于将诸如X射线的辐射转换成可见光的复合荧光屏。 屏幕包括可以由玻璃，硅或金属形成的平坦表面，其在其中蚀刻了具有大约10微米或更小的直径的多个紧密间隔的微通道。 沉积在每个微通道内的是在辐射作用时发光的多种荧光体。 微通道和/或衬底表面的壁包括光反射涂层，以将由磷光体发射的光反射到诸如膜或电子检测器的光收集装置。 根据具体应用，涂层可以是辐射透明的或过滤/衰减的。

公开(公告)号：US06452184B1

公开(公告)日：2002-09-17

申请号：US09385995

申请日：1999-08-30

申请人： Nikhil R. Taskar ,  John Victor D. Veliadis ,  Vishal Chhabra ,  Bharail Kulkarni ,  Neeta Pandit ,  Rameshwar Nath Bhargava ,  Roger Delano

发明人： Nikhil R. Taskar ,  John Victor D. Veliadis ,  Vishal Chhabra ,  Bharail Kulkarni ,  Neeta Pandit ,  Rameshwar Nath Bhargava ,  Roger Delano

IPC分类号： G01T120

CPC分类号： G01T1/20 ,  G21K2004/06 ,  G21K2004/12

摘要： A composite phosphor screen for converting radiation, such as X-rays, into visible light. The screen includes a planar surface, which can be formed from glass, silicon or metal, which has etched therein a multiplicity of closely spaced microchannels having diameters of the order of 10 microns or less. Deposited within each of the microchannels is a multiplicity of phosphors which emit light when acted upon by radiation. A photomultiplier, which may be microchannel based, is integrated with the X-ray detector so as to provide an enhanced output for use with low level X-ray of for cine or fluoroscopy applications. The walls of the microchannels and/or the substrate surfaces include dielectric stack based light reflective coatings.

摘要翻译： 用于将诸如X射线的辐射转换成可见光的复合荧光屏。 屏幕包括可以由玻璃，硅或金属形成的平坦表面，其在其中蚀刻了具有大约10微米或更小的直径的多个紧密间隔的微通道。 沉积在每个微通道内的是在辐射作用时发光的多种荧光体。 可以将基于微通道的光电倍增管与X射线检测器集成，以提供用于电影或荧光透视应用的低水平X射线的增强输出。 微通道和/或衬底表面的壁包括基于电介质叠层的光反射涂层。

公开(公告)号：US06534772B1

公开(公告)日：2003-03-18

申请号：US09688662

申请日：2000-10-16

申请人： Vishal Chhabra ,  Rameshwar Nath Bhargava ,  Dennis Gallagher ,  Samuel P. Herko ,  Bharati S. Kulkarni ,  Nikhil R. Taskar ,  Aleksey Yekimov

发明人： Vishal Chhabra ,  Rameshwar Nath Bhargava ,  Dennis Gallagher ,  Samuel P. Herko ,  Bharati S. Kulkarni ,  Nikhil R. Taskar ,  Aleksey Yekimov

IPC分类号： G01T120

CPC分类号： G21K4/00 ,  G01T1/20 ,  G01T1/2921 ,  G21K2004/06 ,  G21K2004/12 ,  H01J2231/50036 ,  H01J2231/5016 ,  Y10S977/89

摘要： A microchannel phosphor screen for converting radiation, such as X-rays, into visible light. The screen includes a planar surface, which can be formed from glass, silicon or metal, which has etched therein a multiplicity of closely spaced microchannels having diameters of the order of 40 microns or less. Deposited within each of the microchannels is a multiplicity of phosphors which emit light when acted upon by radiation. The dimensions of the microchannel and the phosphors and the relationship between the microchannels and the phosphors is optimized so that the light output compares favorably with lower resolution non microchannel based scintillation screens. A photomultiplier can be integrated with the X-ray detector so as to provide an enhanced output for use with low level X-ray of for cine or fluoroscopy applications.

摘要翻译： 用于将诸如X射线的辐射转换成可见光的微通道荧光屏。 屏幕包括可以由玻璃，硅或金属形成的平坦表面，其在其中蚀刻了许多直径为40微米或更小的直径的紧密间隔的微通道。 沉积在每个微通道内的是在辐射作用时发光的多种荧光体。 微通道和磷光体的尺寸以及微通道和荧光体之间的关系被优化，使得光输出与较低分辨率的非微通道闪烁屏相比较。 光电倍增管可与X射线检测器集成，以提供增强的输出，用于电影或荧光透视应用的低电平X射线。

公开(公告)号：US06674837B1

公开(公告)日：2004-01-06

申请号：US10172704

申请日：2002-06-14

申请人： Nikhil R. Taskar ,  Rameshwar Nath Bhargava ,  Paul J. Patt

发明人： Nikhil R. Taskar ,  Rameshwar Nath Bhargava ,  Paul J. Patt

IPC分类号： H01J3500

CPC分类号： A61B6/542 ,  A61B6/00 ,  A61B6/4028 ,  A61B6/4216 ,  A61B6/482 ,  G01T1/2928 ,  H01J2235/068 ,  Y10S977/928

摘要： An X-ray imaging system utilizing a pixelated X-ray source and a X-ray imaging detector operated synchronously. The imaging system may be used in industrial and medical applications. The X-ray source and X-ray detector are synchronized such that a corresponding area of the X-ray detector is activated when the corresponding area of the X-ray source is emitting X-rays. Synchronized and adaptive emission and detection of the X-rays results in scatter rejection, improved image quality, and optimum exposure and dose reduction.

摘要翻译： 使用像素化X射线源的X射线成像系统和同步运行的X射线成像检测器。 成像系统可用于工业和医疗应用。 X射线源和X射线检测器被同步，使得当X射线源的相应区域发射X射线时，X射线检测器的相应区域被激活。 X射线的同步和自适应发射和检测导致散射抑制，改善的图像质量以及最佳的曝光和剂量降低。

公开(公告)号：US06734465B1

公开(公告)日：2004-05-11

申请号：US10299410

申请日：2002-11-19

申请人： Nikhil R. Taskar ,  Rameshwar Nath Bhargava

发明人： Nikhil R. Taskar ,  Rameshwar Nath Bhargava

IPC分类号： H01L2715

CPC分类号： H01L33/502 ,  H01L33/44 ,  H01L33/54

摘要： A photonic structure for “white” light generation by phosphors under the excitation of a LED. The photonic structure mounts the LED and an optically transparent matrix having dispersed therein phosphors which will emit light under the excitation of the radiation of the LED. The transparent matrix may include nanoparticles for matching the index of refraction of the material of the matrix to that of the light generating phosphors. The matrix material may be readily formed by molding and formed into a variety of shapes including lenses for focusing the emitted light. A large number of the photonic structures may be arranged on a substrate to provide even illumination or other purposes. The phosphors dispersed in the matrix are preferably nanocrystalline.

摘要翻译： 在LED的激发下由磷光体产生“白”光的光子结构。 光子结构安装LED和其中分散有荧光体的光学透明矩阵，其将在LED的辐射的激发下发光。 透明矩阵可以包括纳米粒子，用于将矩阵材料的折射率与发光荧光体的折射率进行匹配。 基质材料可以容易地通过模塑形成并形成为包括用于聚焦发射光的透镜的各种形状。 大量的光子结构可以被布置在基板上以提供均匀的照明或其它目的。 分散在基质中的磷光体优选是纳米晶体。

公开(公告)号：US6036886A

公开(公告)日：2000-03-14

申请号：US124472

申请日：1998-07-29

申请人： Vishal Chhabra ,  Bharati S. Kulkarni ,  Rameshwar Nath Bhargava

发明人： Vishal Chhabra ,  Bharati S. Kulkarni ,  Rameshwar Nath Bhargava

IPC分类号： C01B13/32 ,  C09K11/77 ,  C01G1/02

CPC分类号： B82Y30/00 ,  C01B13/328 ,  C09K11/7701 ,  C09K11/7769 ,  C01P2004/64

摘要： A process for the production of metal oxide nanocrystals activated with a rare earth element, which are useful as phosphors. The nanocrystal oxides are produced by a micellar microemulsion process. In the process an aqueous solutions of the host and activator is prepared and added to a mixture of oil and a micelle forming surfactant and cosurfactant to form a first water in oil microemulsion. An aqueous solution of a hydroxide containing compound is added to a second mixture of oil and a micelle forming surfactant and cosurfactant to form a second water in oil microemulsion. The two microemulsions are added together which cause the micelle units to coalesce and decoalesce and to form a nanocrystalline hydroxide compound of the host and activator. The solution is washed and treated so as to remove byproducts. Thereafter the hydroxide compound is converted to an nanocrystalline activated oxide.

摘要翻译： 用于生产用稀土元素活化的金属氧化物纳米晶体的方法，其可用作磷光体。 纳米晶体氧化物通过胶束微乳液法生产。 在该方法中，制备主体和活化剂的水溶液并将其加入到油和形成胶束的表面活性剂和辅助表面活性剂的混合物中以形成第一水中的油微乳液。 将含氢氧化物的化合物的水溶液加入到油和形成胶束的表面活性剂和辅助表面活性剂的第二混合物中以形成第二水中的油微乳液。 将两种微乳液加入到一起，这使得胶束单元聚结并解质并形成主体和活化剂的纳米晶体氢氧化物化合物。 将溶液洗涤并处理以除去副产物。 此后，将氢氧化物转化为纳米晶体活化氧化物。

公开(公告)号：US07175778B1

公开(公告)日：2007-02-13

申请号：US10436289

申请日：2003-05-12

申请人： Rameshwar Nath Bhargava ,  Vishal Chhabra

发明人： Rameshwar Nath Bhargava ,  Vishal Chhabra

IPC分类号： H01F1/00 ,  C09K11/02

CPC分类号： H01F1/0036 ,  B82Y25/00 ,  C09K11/7769 ,  H01F1/0063 ,  H01F1/0072 ,  Y10S977/774 ,  Y10S977/779 ,  Y10S977/783 ,  Y10S977/811 ,  Y10S977/834 ,  Y10S977/838 ,  Y10T428/2991

摘要： The present application is directed to the preparation and use of a class of nanoparticles called Quantum Confined Atoms or QCA's. A QCA is a particle of material comprising a plurality of host atoms in a nanoparticle of a size of less than 10 nm with a single atom of a dopant (or activator) confined within. The QCA's have unique luminescent and optical properties and thus can act as a very efficient nanophosphor which generate polarized light and can operate as a laser and a nanomagnet. An anti-agglomeration coating surrounding the nanoparticles can prevent clumping and loss of the enhanced properties.

摘要翻译： 本申请涉及一类称为量子限制原子或QCA的纳米颗粒的制备和使用。 QCA是包含尺寸小于10nm的纳米颗粒中的多个宿主原子的材料颗粒，其中限定在其内的掺杂剂（或活化剂）的单个原子。 QCA具有独特的发光和光学特性，因此可以作为产生偏振光并可作为激光和纳米磁体工作的非常有效的纳米荧光体。 围绕纳米颗粒的抗附聚涂层可以防止结块和损失增强的性能。

公开(公告)号：US5952665A

公开(公告)日：1999-09-14

申请号：US980416

申请日：1997-11-28

申请人： Rameshwar Nath Bhargava

发明人： Rameshwar Nath Bhargava

IPC分类号： G01T1/20

CPC分类号： G01T1/20 ,  G21K2004/06 ,  G21K2004/12

摘要： A composite phosphor screen for converting radiation, such as X-rays, into visible light. The screen includes a planar surface, which can be formed from glass, silicon or metal, which has etched therein a multiplicity of closely spaced nanochannels having diameters of the order of 5 microns or less. Deposited within each of the nanochannels is a multiplicity of nanocrystalline phosphors, having diameters of less than 100 nanometers and preferably less than 10 nanometers, which emit light when acted upon by radiation. The walls of the nanochannels are arranged to reflect the light emitted by the nanophoshors down the nanochannels to suitable light collecting device such as film or an electronic device. This minimizes light scattering and increases light collection efficiency.

摘要翻译： 用于将诸如X射线的辐射转换成可见光的复合荧光屏。 屏幕包括可以由玻璃，硅或金属形成的平坦表面，其在其中蚀刻了多个紧密间隔的具有5微米或更小数量级的紧密间隔的纳米通道。 沉积在每个纳米通道内的是多种纳米晶体荧光体，其直径小于100纳米，优选小于10纳米，当辐射作用时发光。 纳米通道的壁布置成将由纳米光束发射的纳米光通道的纳米通道向下反射到合适的光收集装置如薄膜或电子装置。 这样可以最大限度地减少光散射并提高光的收集效率。

公开(公告)号：US07993541B1

公开(公告)日：2011-08-09

申请号：US11705383

申请日：2007-02-12

申请人： Rameshwar Nath Bhargava ,  Haranath Divi ,  Adosh Mehta

发明人： Rameshwar Nath Bhargava ,  Haranath Divi ,  Adosh Mehta

IPC分类号： H01F1/00

CPC分类号： B82Y25/00 ,  H01F1/0054 ,  H01F1/0063 ,  H01F1/0072 ,  Y10S977/774 ,  Y10S977/811 ,  Y10S977/824 ,  Y10S977/83 ,  Y10S977/838 ,  Y10T428/2991 ,  Y10T428/2998

摘要： The present application is directed to the preparation and use of a class of nanoparticles that contain a single Quantum Confined dopant. A QCA nanocrystal comprises of a plurality of host atoms in a nanocrystal of a size of less than 10 nm with a single atom of a dopant (or activator). This single QCA dopant, when confined, becomes polarized and creates a large magnetic-moment in a nanosize host that contains atoms of unpaired spins. The quantum confined atom (QCA) which is now pinned, triggers the alignment of the host atoms resulting in nanosize magnetic domain. Engineering of nanomagnets based on QCA nanoparticles can be used in different applications such as: sensors, drug delivery, bio-tagging, cell/DNA tagging, magnetic memories and others.

摘要翻译： 本申请涉及制备和使用含有单一量子限制掺杂剂的一类纳米粒子。 QCA纳米晶体由尺寸小于10nm的纳米晶体中的多个主体原子与掺杂剂（或活化剂）的单个原子组成。 当限制时，这种单一的QCA掺杂剂变成极化的，并且在纳米尺度的主体中产生了包含不成对自旋原子的大的磁矩。 现在固定的量子限制原子（QCA）触发了导致纳米尺度磁畴的主体原子的取向。 基于QCA纳米颗粒的纳米磁体的工程可用于不同的应用，如：传感器，药物递送，生物标记，细胞/ DNA标签，磁记忆等。