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Improving the optical performance of multi-chip LEDs by using patterned phosphor configurations.

Xinrui Ding, Qiu Chen, Yong Tang

    Optics Express
    |April 4, 2018
    PubMed
    Summary
    This summary is machine-generated.

    A novel patterned phosphor configuration using a pulsing spray process significantly enhances multi-chip LED color uniformity and luminous flux. This yellow central coating (YCC) method improves LED optical performance, reducing color temperature variations.

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    Area of Science:

    • Solid-state lighting
    • Optoelectronics
    • Materials science

    Background:

    • Multi-chip Light Emitting Diodes (LEDs) often suffer from color nonuniformity.
    • Conventional phosphor coatings can lead to inconsistent color distribution and reduced luminous efficiency.

    Purpose of the Study:

    • To develop and evaluate a patterned phosphor configuration for improved color uniformity in multi-chip LEDs.
    • To investigate the impact of different phosphor parameters on optical performance.

    Main Methods:

    • A novel pulsing spray process was employed to create a patterned phosphor configuration.
    • Detached yellow and red phosphor regions were designed to match individual LED chips.
    • Optical performances were experimentally investigated for various phosphor parameters.

    Main Results:

    • The yellow central coating (YCC) configuration demonstrated superior chromatic uniformity and luminous performance.
    • Compared to conventional coatings, YCC improved luminous flux by 20.6%.
    • The difference in correlated color temperature (CCT) distribution decreased significantly from 1362K to 489K.

    Conclusions:

    • The proposed patterned phosphor configuration, particularly the YCC method, effectively enhances optical properties of multi-chip LEDs.
    • This technique offers a viable solution for achieving better color uniformity and luminous efficiency in LED applications.