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    • 1. 发明授权
    • Red-deficiency-compensating phosphor LED
    • 红色补偿荧光粉LED
    • US06351069B1
    • 2002-02-26
    • US09252207
    • 1999-02-18
    • Christopher H. LoweryGerd MuellerRegina Mueller
    • Christopher H. LoweryGerd MuellerRegina Mueller
    • H05B3314
    • H01L33/504
    • A light emitting device and a method of fabricating the device utilize a supplementary fluorescent material that radiates secondary light in the red spectral region of the visible light spectrum to increase the red color component of the composite output light. The secondary light from the supplementary fluorescent material allows the device to produce “white” output light that is well-balanced with respect to color for true color rendering applications. The supplementary fluorescent material is included in a fluorescent layer that is positioned between a die and a lens of the device. The die is preferably a GaN based die that emits light having a peak wavelength of 470 nm. The fluorescent layer also includes a main fluorescent material. Preferably, the main fluorescent material is Cerium (Ce) activated and Gadolinium (Gd) doped Yttrium Aluminum Garnet (YAG) phosphor (“Ce:YAG phosphor”). In a first preferred embodiment, the supplementary fluorescent material is a compound that is produced by doping the Ce:YAG phosphor with a trivalent ion of Praseodymium (Pr). In a second preferred embodiment, the supplementary fluorescent material is Europium (Eu) activated Strontium Sulphide (SrS) phosphor. The amount of supplementary phosphor in the fluorescent layer can vary depending on the amount of red color that may be required in the white output light. The exact amount of supplementary phosphor is not critical to the invention.
    • 发光器件和制造该器件的方法利用在可见光谱的红色光谱区域中辐射次级光的辅助荧光材料以增加复合输出光的红色分量。 来自辅助荧光材料的二次光允许该装置产生相对于真彩色渲染应用的颜色平衡良好的“白色”输出光。 辅助荧光材料包括在位于模具和装置的透镜之间的荧光层中。 芯片优选是发射峰值波长为470nm的光的GaN基管芯。 荧光层还包括主荧光材料。 优选地,主荧光材料是铈(Ce)活化的和掺杂钆(Gd)的钇铝石榴石(YAG)荧光体(“Ce:YAG磷”)。 在第一优选实施方案中,辅助荧光材料是通过用三价镨(Pr)离子掺杂Ce:YAG荧光体而制备的化合物。 在第二优选实施方案中,辅助荧光材料是铕(Eu)活化的硫化锶(SrS)荧光体。 荧光层中的补充磷光体的量可以根据白色输出光中可能需要的红色的量而变化。 补充磷光体的确切量对本发明不是关键的。