Thermally Stable Pyrochlore Y2Ti2O7: Eu3+ Orange–Red Emitting Phosphors

Authors

  • Pengpeng Dai,

    1. Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, China
    Search for more papers by this author
  • Xintong Zhang,

    Corresponding author
    • Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, China
    Search for more papers by this author
  • Meng Zhou,

    1. Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, China
    Search for more papers by this author
  • Xinghua Li,

    1. Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, China
    Search for more papers by this author
  • Jikai Yang,

    1. Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, China
    Search for more papers by this author
  • Panpan Sun,

    1. Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, China
    Search for more papers by this author
  • Changshan Xu,

    1. Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, China
    Search for more papers by this author
  • Yichun Liu

    Corresponding author
    • Center for Advanced Optoelectronic Functional Materials Research, Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, China
    Search for more papers by this author

Authors to whom correspondence should be addressed. Tel./Fax: +86 431 85099772. e-mails: xtzhang@nenu.edu.cn (X.Z.) and ycliu@nenu.edu.cn (Y.L.).

Abstract

Pyrochlore-structured Y2Ti2O7 doped with Eu3+ activators via high-temperature solid-state reaction shows thermally stable orange-red emission under near ultraviolet excitation. The concentration of Eu3+ activators was observed to influence both the intensity and color point of photoluminescence of Y2−xTi2O7:xEu3+ phosphors. The optimal doping concentration is around x = 0.45 determined by photoluminescence intensity; at this concentration, the luminescence branch ratio inline image, named as the luminous intensity ratio of 5D07F2 (R) and 5D07F1 (O) transition is also at maximum, about 0.46. This orange–red emitting phosphor Y1.55Ti2O7:0.45Eu3+ shows excellent thermal stability in luminescence intensity, retaining 84% of room-temperature luminescence at 250°C. Therefore, Y1.55Ti2O7:0.45Eu3+ phosphors may have great potential as an orange–red component for white light-emitting diodes, especially for the high-power devices.

Ancillary