The Making of an LED Die

LED lamps emit light through an 'LED Die,' which is a light-emitting element. But how is an LED Die made? Let's briefly introduce the manufacturing process.

  1.  

    Substrate Process

    The making of an LED Die begins with growing crystals on a substrate.Sapphire is often used as a substrate material due to its superior mechanical and thermal properties, scientific stability, and light transmittance.Crystals are grown on high-temperature sapphire substrates by spraying gases such as nitrogen and gallium.

    Substrate Process

  2.  

    Crystal growth

    By the process of crystal growth, we create a laminated film composed of an N layer, a light-emitting layer, and a P layer.This process is crucial as it determines 70% of the LED's characteristics.Additionally, a buffer layer is inserted between the sapphire substrate.The LED layers, which include the buffer layer, N layer, light-emitting layer, and P layer, are a very thin film, approximately 75μm thick.

    Crystal growth MOVIE

  3.  

    Electrode Formation

    On top of the LED light-emitting layer, we form electrodes and protective films to finish the LED chip.The completed substrate is made with tens of thousands of electrodes for the LED die

    Electrode Formation

  4.  

    Cutting

    Each substrate is carefully cut one by one.

    Cutting

  5.  

    Characteristic Measurement

    The electrical characteristics of each die are measured, classified according to their uses, and the die are completed.

    Characteristic Measurement

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