Effects of HfO2 dopant on characteristics of Li2MgTiO4-based red phosphors: Thermal stability, photoluminescence intensity and quantum efficiency improvement

Li Fang Nien, Chung Hao Chiang, Hsiau Hsian Nien, Sheng Yuan Chu

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

To produce natural and vivid color, the color rendering index of white light-emitting diodes (WLEDs) with single phosphors is usually lower than 70, which is problematic for LED applications. A commonly used method to resolve this issue is to enhance the red component of WLEDs. In the present study, Hf4+ and Mn4+ co-doped Li2MgTiO4 red phosphors are synthesized using a solid-state reaction method. When this red phosphor is excited at 397 and 468 nm, it exhibits weak reabsorption in the blue region and emits a broad and deep red emission band in the range of 640–750 nm, which is attributed to the 2Eg4A2 g transition. With 5 mol% HfO2 dopant, the photoluminescence intensity is enhanced by 1.45-fold and thermal stability is increased by 7.7%. Moreover, this red phosphor was applied to a red phosphor-in-glass (RPiG) optical device with a low-melting TeO2-B2O3-ZnO-Na2O-WO3 glass system. In the RPiG melting process, Li2MgTiO4:Mn4+, Hf4+ red phosphor triggered neither a chemical reaction nor severe degradation, indicating good thermal stability. Li2MgTiO4:Mn4+, Hf4+ has potential as a red emission material for warm WLED applications.

Original languageEnglish
Pages (from-to)15428-15431
Number of pages4
JournalCeramics International
Volume44
Issue number13
DOIs
Publication statusPublished - 2018 Sep

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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