Site-related broadband sensitization in La3Ga5.5Nb0.5O14: Cr3+, Ln3+(Ln = Yb, Er) phosphors

Yajie Li; Lixia Cheng; Min Liu; Weiping Gong; Zhenting Zhao; Jinxiang Song; Weidong Tang; Renping Cao

doi:10.1016/j.saa.2020.118085

Site-related broadband sensitization in La₃Ga_5.5Nb_0.5O₁₄: Cr³⁺, Ln³⁺(Ln = Yb, Er) phosphors

Spectrochim Acta A Mol Biomol Spectrosc. 2020 Apr 5:230:118085. doi: 10.1016/j.saa.2020.118085. Epub 2020 Jan 20.

Authors

Yajie Li¹, Lixia Cheng², Min Liu², Weiping Gong², Zhenting Zhao², Jinxiang Song², Weidong Tang², Renping Cao³

Affiliations

¹ Electronic Functional Materials Laboratory, Huizhou University, Huizhou 516007, PR China. Electronic address: virjoy_913@163.com.
² Electronic Functional Materials Laboratory, Huizhou University, Huizhou 516007, PR China.
³ College of Mathematics and Physics, Jinggangshan University, Ji'an 343009, PR China.

PMID: 32004870
DOI: 10.1016/j.saa.2020.118085

Abstract

Yb³⁺ 1000 nm and Er³⁺ 1536 nm emission can be efficiently sensitized by broadband absorption of Cr³⁺ in almost the whole visible region in La₃Ga_5.5Nb_0.5O₁₄(LGNO): Cr³⁺, Ln³⁺ (Ln = Yb, Er) phosphor. Between the two kinds of Cr³⁺ sites, tetrahedral Cr(II) mainly behaves as the broadband sensitizer for Er³⁺ or Yb³⁺. Meanwhile octahedral Cr(I) may energy transfer (ET) to Cr(II), thereby influences the luminescence decay of Cr(II) as increasing Er³⁺ or Yb³⁺ content. This kind of site-related broadband sensitization may propose a strategy of designing tunable ET process between transition metal ions and rare earth ions.

Keywords: Broadband sensitization; Luminescence decay lifetime; Site-related energy transfer; Visible range.