Tuning of near-infrared-to-near-infrared luminescence from one-photon to two-photon anti-Stokes shift in Ca3Ga2- xCrxGe3O12 via varying Cr3+ content

Huihong Lin; Ting Yu; Gongxun Bai; Qinyuan Zhang; Jianhua Hao

doi:10.1364/OL.42.000715

Tuning of near-infrared-to-near-infrared luminescence from one-photon to two-photon anti-Stokes shift in Ca₃Ga_2- _xCr_xGe₃O₁₂ via varying Cr³⁺ content

Opt Lett. 2017 Feb 15;42(4):715-718. doi: 10.1364/OL.42.000715.

Authors

Huihong Lin, Ting Yu, Gongxun Bai, Qinyuan Zhang, Jianhua Hao

PMID: 28198847
DOI: 10.1364/OL.42.000715

Abstract

Near-infrared-to-near-infrared (NIR-to-NIR) anti-Stokes luminescence from Cr³⁺ singly doped Ca₃Ga₂Ge₃O₁₂ (CGGG) occurs under the excitation of an 808 nm diode laser. The anti-Stokes processes vary from one photon to two photon, depending on the Cr³⁺ content (x) in Ca₃Ga_2-xCr_xGe₃O₁₂. The results suggest that phonon-assisted anti-Stokes excitation and cooperative energy transfer are involved in the observed upconversion (UC) processes of CGGG:Cr³⁺. The relevant Cr³⁺-doping-concentration-dependent NIR-to-NIR anti-Stokes luminescent mechanism, either one-photon or two-photon UC, is investigated. Such an observation on modulating the UC process via varying the doping concentration is helpful in broadening the understanding of UC phenomena.