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Title: Tuning of near-infrared-to-near-infrared luminescence from one-photon to two-photon anti-Stokes shift in Ca(3)Ga(2-x)CrxGe(3)O(12) via varying Cr3+ content
Authors: Lin, HH 
Yu, T
Bai, GX 
Zhang, QY
Hao, JH 
Issue Date: 2017
Publisher: Optical Society of America
Source: Optics letters, 2017, v. 42, no. 4, p. 715-718 How to cite?
Journal: Optics letters 
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 Ca3Ga2-x CrxGe3O12. 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.
ISSN: 0146-9592
EISSN: 1539-4794
DOI: 10.1364/OL.42.000715
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