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    Light-emitting devices providing asymmetrical propagation of light
    5.
    发明授权
    Light-emitting devices providing asymmetrical propagation of light 有权

    公开(公告)号：US11353167B2

    公开(公告)日：2022-06-07

    申请号：US17321112

    申请日：2021-05-14

    Applicant: Quarkstar LLC

    Inventor： Roland H. Haitz ,  George E. Smith ,  Robert C. Gardner ,  Louis Lerman

    IPC: G02B19/00 ,  F21K9/60 ,  G02B5/02 ,  F21V13/08 ,  F21V13/02 ,  H01L33/58

    Abstract: A variety of light-emitting devices for general illumination utilizing solid state light sources (e.g., light emitting diodes) are disclosed. In general, the devices include a scattering element in combination with an extractor element. The scattering element, which may include elastic and/or inelastic scattering centers, is spaced apart from the light source element. Opposite sides of the scattering element have asymmetric optical interfaces, there being a larger refractive index mismatch at the interface facing the light emitting element than the interface between the scattering element and the extractor element. Such a structure favors forward scattering of light from the scattering element. In other words, the system favors scattering out of the scattering element into the extractor element over backscattering light towards the light source element. The extractor element, in turn, is sized and shaped to reduce reflection of light exiting the light-emitting device at the devices interface with the ambient environment.

    Lifetime color stabilization of color-shifting artificial light sources
    6.
    发明授权
    Lifetime color stabilization of color-shifting artificial light sources 有权

    公开(公告)号：US11337282B2

    公开(公告)日：2022-05-17

    申请号：US16488463

    申请日：2018-02-28

    Applicant: QUARKSTAR LLC

    Inventor： Eric Bretschneider ,  Louis Lerman ,  Hans Peter Stormberg

    IPC: H05B45/22 ,  H05B45/24 ,  H01L33/50 ,  H05B45/28

    Abstract: A system includes two or more phosphor-containing white LEDs (or other color-shifting artificial light sources) selected so that their combined color shift over at least 8,000 hours (e.g., at least 10,000 hours, at least 20,000 hours, at least 30,000 hours, at least 40,000 hours, up to 200,000 hours, up to 100,000 hours, up to 80,000 hours) of operation is less than at least one of the LED's (or the other color-shifting artificial light source's) color shift over that time. Here, the combined color shift (Δ′v′) over the at least 8,000 hours (e.g., at least 10,000 hours, at least 20,000 hours, at least 30,000 hours, at least 40,000 hours, up to 200,000 hours, up to 100,000 hours, up to 80,000 hours) of operation can be less than 0.007 (e.g., 0.006 or less, 0.005 or less, 0.004 or less, 0.003 or less, 0.002 or less, 0.001 or less, 0.0005 or less).

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