Luminescent properties and microstructure of SiC doped AlON: Eu2+ phosphors

Liang Jun Yin*, Chao Cai, Hui Wang, Yu Jie Zhao, H.V. Bui, Xian Jian, Hui Tang, Xin Wang, Long Jiang Deng, Xin Xu, Ming Hsien Lee

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)


Superior thermal quenching and degradation of phosphors are required for long lifetime lighting devices, such as light-emitting diodes, which can be realized through composition modification. Here, Al-N bonds in AlON: Eu2+ phosphors are substituted by higher bond order of Si-C. Photoluminescence (PL) results show thermal quenching (at 150 °C) and thermal degradation (after 600 °C treatment in air) are improved by 5% and 8% with a small decrease of PL intensity in 5% SiC doped AlON: Eu2+ phosphor. To explain these observations, first-principles computational study was performed to understand the Si and C configuration in AlON:Eu2+. The calculations reveal that Si and C elements are not randomly distributed in AlON lattice. It was found that Si prefers occupying tetrahedral sites (Td-Si) and the insertion of C in Td-Si is always energetically favorable, which results in the formation of SiC4 and SiNC3 clusters. Thus, the Al-N substitution by Si-C induces a stronger local structure, which accounts for the emission redshift and better thermal stability.

Original languageEnglish
Pages (from-to)217-226
Number of pages10
JournalJournal of Alloys and Compounds
Publication statusPublished - 2017


  • First principles theory
  • Oxynitride
  • Photoluminescence
  • Rare-earths


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