White Light-Emitting Diodes (WLEDs) is a promising conserve energy device for altering the traditional illuminating apparatus because of their high efficiency, high flexibility, long lifetime, low energy consumption, and friendly environ ment. Of course you can frequently find WLEDs in your daily life. Phosphor is an important component of WLEDs and has been investigated broadly. This chapter introduces readers who begin meeting these fields to understand phosphor including history, principle, application, and perspective. The first part is a fundamental definition to luminescent materials. The second part provides requirements, classifications, and applications of phosphors for phosphor-converted LEDs (pc-LEDs). Finally, we propose some prospects and challenges of optical materials in the future.
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