发明名称 |
UV reflectors and UV-based light sources having reduced UV radiation leakage incorporating the same |
摘要 |
UV reflectors incorporated in UV LED-based light sources reduce the amount of UV radiation emission into the surroundings and increase the efficiency of such light sources. UV reflectors are made of nanometer-sized particles having a mean particle diameter less than about one-tenth of the wavelength of the UV light emitted by the UV LED, dispersed in a molding or casting material surrounding the LED. Other UV reflectors are series of layers of materials having alternating high and low refractive indices; each layer has a physical thickness of one quarter of the wavelength divided by the refractive index of the material. Nanometer-sized textures formed on a surface of the multilayered reflector further reduce the emission of UV radiation into the surroundings. UV LED-based light sources include such a multilayered reflector disposed on an encapsulating structure of a transparent material around a UV LED, particles of a UV-excitable phosphor dispersed in the transparent material. Alternatively, the transparent material also includes nanometer-sized particles of a UV-radiation scattering material.
|
申请公布号 |
US2002180351(A1) |
申请公布日期 |
2002.12.05 |
申请号 |
US20010681560 |
申请日期 |
2001.04.30 |
申请人 |
MCNULTY THOMAS FRANCIS;DOXSEE DANIEL DARCY;ROSE JAMES WILSON |
发明人 |
MCNULTY THOMAS FRANCIS;DOXSEE DANIEL DARCY;ROSE JAMES WILSON |
分类号 |
G02B5/20;H01L33/44;H01L33/50;(IPC1-7):H01J1/62;H01J63/04 |
主分类号 |
G02B5/20 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|