Composition-driven anionic disorder-order transformations triggered single-Eu2+-converted high-color-rendering white-light phosphors

Pengpeng Dai*, Qingling Wang, Mei Xiang, Teng Ming Chen, Xintong Zhang, Yun Wei Chiang, Ting Shan Chan, Xiaojun Wang*

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Single-component, single-activator-converted high-color-rendering index (CRI) white-light phosphors have sparked much interest for phosphor-converted white light-emitting diodes. However, manipulating the distribution and locations of single activators to target desired sites in a given host lattice is still a challenge. Herein, we report the remote regulation of the distribution of Eu2+ ions by engineering and controlling the structural ordering in Sr3(Ce1−xLax)(PO4)3:0.05Eu2+ (SCLP:Eu2+) compound, which are designed by using two-color phosphors with different anionic structural ordering, viz., Sr3Ce(PO4)3:Eu2+ (yellow) with disordered state of PO4 tetrahedra, and Sr3La(PO4)3:Eu2+ (blue) with ordered state of PO4 tetrahedra. The successive substitution of Ce by La triggers a pronounced disorder-to-order structural transformation of PO4 tetrahedra within SCLP:Eu2+ compounds and guides remotely the distribution of Eu2+ activators, which is demonstrated by a detailed analysis of synchrotron X-ray diffraction refinement, electron paramagnetic resonance spectra, electron spin-echo envelope modulation spectra, Raman spectra, nuclear magnetic resonance spectra and micro-cathodoluminescence spectrum. Benefitting from the controllable structural ordering transformation, as-prepared samples form a unique disorder-order crystal structure, exhibiting controllable microstructure acting on Eu2+ ions, tunable-color emissions including a high CRI (Ra = 90) white-light, increased structural rigidity and thermal stability. These interesting findings in the local structure-dependent luminescence properties demonstrate that structural ordering engineering may be an effective approach to regulate the migration of Eu2+ activators and improve the thermal stability of phosphors.

Original languageEnglish
Article number122508
JournalChemical Engineering Journal
Volume380
DOIs
StatePublished - 15 Jan 2020

Keywords

  • Disorder-to-order tunability
  • High-color-rendering
  • Singly Eu-activation
  • White-light phosphor

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