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Photoluminescence properties and energy transfer of $Dy^{3+}$ and $Tm^{3+}$ co-activated $CaZrO_3$ phosphor for white LEDs

  • Li, Yezhou (Department of Materials Science, Institute of Functional and Environmental Materials, School of Physical Science and Technology, Lanzhou University) ;
  • Wang, Yuhua (Department of Materials Science, Institute of Functional and Environmental Materials, School of Physical Science and Technology, Lanzhou University)
  • Received : 2010.12.29
  • Accepted : 2011.02.17
  • Published : 2011.06.30
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Abstract

Single-phased $CaZrO_3:Dy^{3+}$, $Tm^{3+}$ series have been successfully synthesized by solid-state reaction, and their luminescence properties were investigated. Under 355 nm excitation, $CaZrO_3:Dy^{3+}$ series showed characteristic emission of $Dy^{3+}$, which exhibited yellowish white color. By introducing $Tm^{3+}$ into the matrix, the emitted hue of the $Dy^{3+}$-doped sample could be easily tailored to white, and simultaneously, energy transfer from $Tm^{3+}$ to $Dy^{3+}$ was observed. The color coordinates of the optimum white-emitting sample were (0.321, 0.323), which were very close to the data of the National Television Standard Committee (0.33, 0.33). The co-activated phosphors presented good match to ultraviolet light-emitting diodes (LEDs), which revealed that they could be novel promising phosphors utilized in white LED application.

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