LIGHT EMITTING DEVICE
    4.
    发明申请

    公开(公告)号:US20240405160A1

    公开(公告)日:2024-12-05

    申请号:US17839268

    申请日:2022-06-13

    Abstract: The presented devices and methods are directed to efficient and effective photon emission. In one embodiment, high-performance tunnel junction deep ultraviolet (UV) light-emitting diodes (LEDs) are created using plasma-assisted molecular beam epitaxy. The device heterostructure was grown under slightly Ga-rich conditions to promote the formation of nanoscale clusters in the active region. The nanoscale clusters can act as charge containment configurations. In one exemplary implementation, a device operates at approximately 255 nm light emission with a maximum external quantum efficiency (EPE) of 7.2% and wall-plug efficiency (WPE) of 4%, which are nearly one to two orders of magnitude higher than previously reported tunnel junction devices operating at this wavelength. The devices exhibit highly stable emission originating from highly localized carriers in Ga-rich regions formed in the active region, with nearly constant emission peak with increasing current density up to 200 A/cm2, due to the strong charge carrier confinement related to the presence of nanoclusters (e.g., Ga-rich) and radiative emission originating from highly localized carriers in Ga-rich regions formed in the active region

    NEGATIVE RESISTANCE PREAMPLIFIER FOR INDUCTIVELY COUPLED LOCAL MRI COILS
    10.
    发明申请
    NEGATIVE RESISTANCE PREAMPLIFIER FOR INDUCTIVELY COUPLED LOCAL MRI COILS 审中-公开
    用于感应耦合的局部MRI线圈的负电阻前置放大器

    公开(公告)号:US20170067974A1

    公开(公告)日:2017-03-09

    申请号:US15309336

    申请日:2015-05-07

    CPC classification number: G01R33/3621 G01R33/3642 G01R33/3692 G01R33/5616

    Abstract: A novel MRI-compatible amplifier design uses positive feedback from a low-noise Field-Effect Transistor to amplify the signal current within a resonant NMR coil. The amplified signal current in this low-power circuit produces RF flux can be coupled out to receiving loops positioned externally without significant loss in sensitivity. In other aspects, the amplifier may be remotely powered by external resonant loops, a small non-magnetic battery, or optical power, such that the NMR coil can be positioned during highly invasive procedures such as for surgical resection of tumors in deep-lying tissues to develop high-resolution images.

    Abstract translation: 一种新颖的MRI兼容放大器设计使用来自低噪声场效应晶体管的正反馈来放大谐振NMR线圈内的信号电流。 该低功率电路中放大的信号电流产生的RF通量可以耦合到外部定位的接收回路,而灵敏度没有显着的损失。 在其他方面,放大器可以由外部谐振回路,小型非磁性电池或光学功率远程供电,使得NMR线圈可以在高侵入性程序中定位,例如用于在深层组织中手术切除肿瘤 开发高分辨率图像。

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