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T7.02 - A New Rare-Earth-Free Yellow Phosphor with High Quantum Efficiency and Luminous Efficacy for White LEDs 
December 3, 2014   2:15pm - 2:30pm

Solid-state lighting technology has been booming in recent years due to its wide use in lighting and displays. White light-emitting diodes (WLEDs), which are the most desirable of all LEDs for general illumination, are expected to be the dominant source of lighting in the near future. The most economically viable WLEDs are phosphor-converted (PC). In a PC-WLED, a one-chip LED is coated with a single phosphor or a mixture of phosphors to generate white light, such as a blue LED coated with a yellow phosphor. Current commercially available yellow phosphors are heavily dependent on rare-earth elements. Due to a potential supply crisis, the search for rare-earth-free yellow phosphors is becoming a pressing matter. Here we build a new rare-earth-free yellow hybrid phosphor by anchoring a preselected organic chromophore into a framework structure with metal nodes. The immobilization of the organic chromophore shifts the compound’s emission further into the yellow region, with quantum efficiency comparable to the commercially available phosphor YAG:Ce3+. This new compound is subject to a broad range of excitation energy, from UV to blue light. Coating a blue LED with this new phosphor readily generates white light with high luminous efficacy. Our new rare-earth-free yellow phosphor thus demonstrates great potential for use in PC-WLEDs.

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