High-Performance NaK2Li[Li3SiO4]4:Eu Green Phosphor for Backlighting Light-Emitting Diodes

Mu Huai Fang, Carl Osby M. Mariano, Kuan Chun Chen, Jia Cheng Lin, Zhen Bao, Sebastian Mahlik, Tadeusz Lesniewski, Kuang Mao Lu, Ying Rui Lu, Yu Jong Wu, Hwo Shuenn Sheu, Jyh Fu Lee, Shu Fen Hu, Ru Shi Liu*, J. Paul Attfield

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Narrowband green phosphors with high quantum efficiency are required for backlighting white light-emitting diode (WLED) devices. Materials from the A[Li3SiO4]4:Eu2+ family have recently been proposed as having superior properties to industry-standard β-SiAlON green phosphors. Here, we show that a cheap, easily synthesized host NaK2Li[Li3SiO4]4 (NKLLSO) doped with a mixture of Eu2+ and Eu3+ is an outstanding narrowband green phosphor, with an external quantum efficiency of 51% and superb thermal stability (97.1% of room-temperature performance at 150 °C). Structural studies reveal that green emission occurs from two Eu2+ sites, while Eu3+ introduces a high concentration of vacancies that may suppress quenching from energy transfer between Eu2+ sites. A WLED package constructed using our NKLLSO phosphor shows extremely high color vividness, competitive with a β-SiAlON comparator. This work will stimulate further research on efficient green phosphors for practical WLED devices.

Original languageEnglish
Pages (from-to)1893-1899
Number of pages7
JournalChemistry of Materials
Volume33
Issue number5
DOIs
Publication statusAccepted/In press - 2021

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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