Crystal-site engineering for developing tunable green light emitting Ba9Lu2Si6O24:Eu2+ phosphors for efficient white LEDs

Sayed Ali Khan, Zhong Hao, Wei Wei Ji, Noor Zamin Khan, Hamidreza Abadikhah, Luyuan Hao, Xin Xu, Simeon Agathopoulos, Qiaoliang Bao

Research output: Contribution to journalArticleResearchpeer-review

12 Citations (Scopus)

Abstract

Phosphors with tuning capabilities in their excitation and emission spectra are in high demand in the field of advanced optical technology. In this article, Eu2+ doped Ba9Lu2Si6O24 (BLSO: Eu2+) phosphors, which emit an intense light hat can be tuned from dark blue (463 nm) to efficient green (514 nm), were produced, simply by increasing the Eu2+ concentration in the BLSO host lattice. This tuning capability suggests that there are multiple and distinguishable crystallographic sites in the host lattice of the BLSO phosphors. The Eu2+ activators exhibit preferable site distributions in the BLSO host lattice, depending on the Eu2+ concentration. This offers the possibility for engineering the appropriate site surroundings, available for the Eu2+ activators. The Ba8.4Eu0.6Lu2Si6O24 phosphor displays a prominent yellowish-green emission under blue light (440 nm) excitation, compared to the dark blue emission of BLSO: 0.1Eu2+ phosphors. The green emission from the BLSO: xEu2+ phosphor is closely associated with the specific coordinating environment of the Eu2+ activator in various crystallographic Ba sites. However, concentration quenching phenomena results in intensity decrease, a problem which is then solved by introducing Sr2+.

Original languageEnglish
Pages (from-to)374-381
Number of pages8
JournalJournal of Alloys and Compounds
Volume767
DOIs
Publication statusPublished - 30 Oct 2018
Externally publishedYes

Keywords

  • Cation substitution
  • Crystal site engineering
  • Phosphor host
  • Photoluminescence

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