Photoluminescent Evolution Induced by Structural Transformation Through Thermal Treating in the Red Narrow-Band Phosphor K2GeF6:Mn4+

Ling Ling Wei, Chun Che Lin, Yi Ying Wang, Mu Huai Fang, Huan Jiao, Ru Shi Liu

Research output: Contribution to journalArticle


This study explored optimal preparation conditions for K2GeF6:Mn4+ red phosphors by using chemical coprecipitation method. The prepared hexagonal P3m1 K2GeF6:Mn4+ exhibited efficient red emission, high color purity, good Mn4+ concentration stability, and low thermal quenching. Structural evolution from hexagonal P3m1 to P63mc and then P63mc to cubic Fm3m occurred after thermal treatment at approximately 400 and 500°C, respectively. Hexagonal P63mc phase showed an obvious zero phonon line peak at 621 nm, whereas cubic Fm3m phase showed no red emission. Yellowish K2GeF6:Mn4+ with both hexagonal P3m1 and P63mc symmetries are promising commercial red phosphors for white light-emitting diodes. (Figure Presented)

Original languageEnglish
Pages (from-to)10656-10659
Number of pages4
JournalACS Applied Materials and Interfaces
Issue number20
Publication statusPublished - May 27 2015
Externally publishedYes



  • chemical coprecipitation method
  • phosphors
  • photoluminescent properties
  • structural evolution
  • thermal stability

ASJC Scopus subject areas

  • Materials Science(all)

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