신소재공학과

Seminar

Date 20170328 

Regular Seminar Announcement



■ Title: Self-healing phosphor: New paradigm for high-power LED lighting

                      
■ Speaker: Prof. Lim Won Bin (Jeonnam National University)

 

■ Date and time: 28th of March (Tue) 16:00

 

■ Venue: KAIST Applied Engineering B/D(W1), Multimedia Lecture Hall (1st Floor)

  

 Abstract: Phosphor-converted white light-emitting diodes (pc-WLEDs) are the efficient light source that has multifarious applications in lighting, high-tech displays, and electronic devices. One of the biggest challenge of pc-WLEDs are the thermal quenching, in which phosphor suffers from emission loss with increasing temperature during high-power LED operation and is an inevitable drawback for any existing phosphor. Here we report for the first time, a new blue-emitting phosphor that doesn’t exhibit thermal quenching revealing zero-emission loss even upto 250ºC. This phenomena of non-thermal quenching, denoted as self-healing phosphor, portrays the ability of phosphor in resurrecting the emission loss and sustaining the luminescence with increasing temperature. This finding would initiate the exploration of many self-healing phosphors with non-thermal quenching for high-power LED applications.

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