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A zero-thermal-quenching phosphor
SCI Impact Factor
43.841
Authors
Y. H. Kim, P. Arunkumar, B. Y. Kim, S. Unithrattil, E. Kim, S.-H. Moon, J. Y. Hyun, K. H. Kim, D. Lee, J.-S. Lee, and W. B. Im*
Journal
Nat. Mater.
Status
published
Vol
16
Page
543-550
Year
2017

Phosphor-converted white light-emitting diodes (pc-WLEDs) are efficient light sources used in lighting, high-tech displays, and electronic devices. One of the most significant challenges of pc-WLEDs is the thermal quenching, in which the phosphor suffers from emission loss with increasing temperature during high-power LED operation. Here, we report a blue-emitting Na3–2xSc2(PO4)3:xEu2+ phosphor (λem = 453 nm) that does not exhibit thermal quenching even up to 200 °C. This phenomenon of zero thermal quenching originates from the ability of the phosphor to compensate the emission losses and therefore sustain the luminescence with increasing temperature. The findings are explained by polymorphic modification and possible energy transfer from electron–hole pairs at the thermally activated defect levels to the Eu2+ 5d-band with increasing temperature. Our results could initiate the exploration of phosphors with zero thermal quenching for high-power LED applications. 


- This paper was selected the cover image of issue on May 2017.[Click] 

- In the section of 'News and Views' in Nat. Mater., P. F. Semt and J. J. Joos highlighted our paper, with the title "White light-emitting diodes: Stabilizing colour and intensity".[Click] 

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