Main > HPArticle > High-brightness red-emitting double-perovskite phosphor Sr2LaTaO6:Eu3+ with high color purity and thermal stability
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  • Manuscript Accepted: Jan. 12, 2021

    Online Published: Jan. 13, 2021

Chinese Optics Letters, 2021, Vol. 19, Issue 3, pp.

High-brightness red-emitting double-perovskite phosphor Sr2LaTaO6:Eu3+ with high color purity and thermal stability [Early Posting]

Zhang Zongjie, Li Wei, Ma Nan, Huang Xiaoyong

Author Affiliations

  • Taiyuan University of Technology
  • Taiyuan University of Technology
  • Taiyuan University of Technology

Abstract

Bright Eu3+-activated double-perovskite Sr2LaTaO6 red-emitting phosphors were successfully synthesized by high-temperature solid-state method. Under near-ultraviolet excitation at 394 nm, the optimal Sr2LaTaO6:0.2Eu3+ phosphors emitted high-brightness red light around 613 nm with the CIE chromaticity coordinates (0.650, 0.349). Notably, the color purity can reach 92%. Impressively, the favorable thermal stability of the Sr2LaTaO6:0.2Eu3+ phosphors were characterized by temperature-dependent emission spectra at different temperatures from 303 to 463 K and the emission intensity at 423 K remained 73% of its value at 303 K. All the results suggested that the as-prepared Sr2LaTaO6:0.2Eu3+ phosphors can be used in near-ultraviolet-excitable white light-emitting diodes as red-emitting color converter.

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