Li substituent tuning of LED phosphors with enhanced efficiency, tunable photoluminescence, and improved thermal stability

Ming Zhao, Zhiguo Xia, Xiaoxiao Huang, Lixin Ning, Romain Gautier, Maxim S. Molokeev, Yayun Zhou, Yu Chun Chuang, Qinyuan Zhang, Quanlin Liu, Kenneth R. Poeppelmeier

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Solid-state phosphor-converted white light-emitting diodes (pc-WLEDs) are currently revolutionizing the lighting industry. To advance the technology, phosphors with high efficiency, tunable photoluminescence, and high thermal stability are required. Here, we demonstrate that a simple lithium incorporation in NaAlSiO4:Eu system enables the simultaneous fulfillment of the three criteria. The Li substitution at Al sites beside Na sites in NaAlSiO 4 :Eu leads to an enhanced emission intensity/efficiency owing to an effective Eu 3+ to Eu 2+ reduction, an emission color tuning from yellow to green by tuning the occupation of different Eu sites, and an improvement of luminescence thermal stability as a result of the interplaywith Li-related defects. A pc-WLED using the Li-codoped NaAlSiO 4 :Eu as a green component exhibits improved performance. The phosphorswithmultiple activator sites can facilitate the positive synergistic effect on luminescence properties.

Original languageEnglish
Article numbereaav0363
JournalScience Advances
Volume5
Issue number1
DOIs
Publication statusPublished - Jan 1 2019

ASJC Scopus subject areas

  • Cultural Studies
  • Communication
  • Visual Arts and Performing Arts
  • General

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    Zhao, M., Xia, Z., Huang, X., Ning, L., Gautier, R., Molokeev, M. S., Zhou, Y., Chuang, Y. C., Zhang, Q., Liu, Q., & Poeppelmeier, K. R. (2019). Li substituent tuning of LED phosphors with enhanced efficiency, tunable photoluminescence, and improved thermal stability. Science Advances, 5(1), [eaav0363]. https://doi.org/10.1126/sciadv.aav0363