A novel Na 3 La(PO 4 ) 2 /LaPO 4 :Eu blue-red dual-emitting phosphor with high thermal stability for plant growth lighting

Mao Xia, Xianbo Wu, Yuan Zhong, Zhi Zhou, Wai Yeung Wong (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

29 Citations (Scopus)

Abstract

A novel Na 3 La 2 (PO 4 ) 3 :xEu (Na 3 La(PO 4 ) 2 /LaPO 4 :xEu) blue-red dual-emission diphasic phosphor with high thermal stability is successfully synthesized by a high temperature solid state reaction. X-ray powder diffraction (XRD) analysis verified that the host of this dual emitting phosphor is a composite material composed of two crystals: Na 3 La(PO 4 ) 2 and LaPO 4 , which would realize the energy transfer between the two phases and then greatly enhance the luminescence properties. When compared with the single-phase phosphor Na 3 La(PO 4 ) 2 :xEu, the photoluminescence (PL) spectra of the as-synthesized diphasic phosphor showed significantly enhanced blue emission peaking at 422 nm of Eu 2+ (5d-4f, a broadband at around 422 nm) and red emission peaking at 594 nm of Eu 3+ ( 5 D 0 - 7 F 1,2 , 594 and 621 nm) under UV excitation. Moreover, the phosphor exhibited a high thermal stability at 150 °C with up to 98.5% luminescence retention after Li + co-doping, which should be attributed to the introduction of several defects. The emission spectra matched well with the photosynthetic action spectra (PAS) in plants, indicating that the Na 3 La 2 (PO 4 ) 3 :xEu phosphor has a promising application in plant growth LED lighting.

Original languageEnglish
Pages (from-to)2385-2393
Number of pages9
JournalJournal of Materials Chemistry C
Volume7
Issue number8
DOIs
Publication statusPublished - 1 Jan 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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