Abstract

Near-infrared-to-near-infrared (NIR-to-NIR) anti-Stokes luminescence from ${\mathrm{Cr}}^{3+}$ singly doped ${\mathrm{Ca}}_3{\mathrm{Ga}}_2{\mathrm{Ge}}_3{\mathrm{O}}_{12}$ (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 ${\mathrm{Cr}}^{3+}$ content ($x$) in ${\mathrm{Ca}}_3{\mathrm{Ga}}_{2-x}{\mathrm{Cr}}_x{\mathrm{Ge}}_3{\mathrm{O}}_{12}$. The results suggest that phonon-assisted anti-Stokes excitation and cooperative energy transfer are involved in the observed upconversion (UC) processes of $\mathrm{CGGG}\text{:}{\mathrm{Cr}}^{3+}$. The relevant ${\mathrm{Cr}}^{3+}$-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.

© 2017 Optical Society of America

Phonon-assisted upconversion charging in Zn₃Ga₂GeO₈:Cr³⁺ near-infrared persistent phosphor

Feng Liu, Yafei Chen, Yanjie Liang, and Zhengwei Pan
Opt. Lett. 41(5) 954-957 (2016)

Enhancing near infrared persistent luminescence from Cr³⁺-activated zinc gallogermanate powders through Ca²⁺ doping

Hu Xu and Guanying Chen
Opt. Mater. Express 7(8) 2783-2792 (2017)

Cr³⁺-doped Bi₂Ga₄O₉-Bi₂Al₄O₉ solid-solution phosphors: crystal-field modulation and lifetime-based temperature sensing

Daqin Chen, Xiao Chen, Xiaoyue Li, Hai Guo, Shen Liu, and Xinyue Li
Opt. Lett. 42(23) 4950-4953 (2017)

Near-infrared persistent luminescence of Yb³⁺ in perovskite phosphor

Zehua Zou, Chen Wu, Xiaodong Li, Jiachi Zhang, Huihui Li, Deyin Wang, and Yuhua Wang
Opt. Lett. 42(21) 4510-4512 (2017)

Laser-induced excited-state crossover and spectral variation of Cr³⁺ in the high-crystal-field environment of CaGa₂O₄

M. Rai, S. K. Singh, and P. Morthekai
Opt. Lett. 41(15) 3635-3638 (2016)