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Related Concept Videos

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In Depth Analyses of LEDs by a Combination of X-ray Computed Tomography CT and Light Microscopy LM Correlated with Scanning Electron Microscopy SEM
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Output blue light evaluation for phosphor based smart white LED wafer level packages.

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    This study introduces a novel silicon photodiode for precisely measuring blue light from white LED packages. The new blue light detector offers enhanced responsivity and quantum efficiency for accurate LED output evaluation.

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    Area of Science:

    • Optoelectronics
    • Semiconductor device physics

    Background:

    • Phosphor-based white LEDs are crucial for lighting applications.
    • Accurate evaluation of blue light output is essential for LED performance and reliability.

    Purpose of the Study:

    • To develop a highly selective blue light detector for white LED packages.
    • To improve responsivity and quantum efficiency compared to existing photodiode structures.

    Main Methods:

    • Design and fabrication of a silicon stripe-shaped photodiode using a 2 μm BiCMOS process.
    • Integration of passive and active devices in 5 lithography steps.
    • Characterization of photodiode responsivity and selectivity at 480 nm.

    Main Results:

    • The fabricated photodiode exhibits high selectivity for blue light, with peak responsivity at 480 nm.
    • The novel structure reduces dead layer effects, enhancing responsivity.
    • A two-fold increase in responsivity and quantum efficiency was achieved compared to similar published sensors.

    Conclusions:

    • The developed blue light detector is suitable for evaluating phosphor-based white LED output.
    • The BiCMOS-integrated photodiode offers superior performance for LED characterization.
    • This advancement contributes to improved LED manufacturing and quality control.