Detection of up-converted persistent luminescence in the near infrared emitted by the Zn₃Ga₂GeO₈:Cr³⁺, Yb³⁺, Er³⁺ phosphor

Feng Liu; Yanjie Liang; Zhengwei Pan

doi:10.1103/PhysRevLett.113.177401

Detection of up-converted persistent luminescence in the near infrared emitted by the Zn₃Ga₂GeO₈:Cr³⁺, Yb³⁺, Er³⁺ phosphor

Phys Rev Lett. 2014 Oct 24;113(17):177401. doi: 10.1103/PhysRevLett.113.177401. Epub 2014 Oct 21.

Authors

Feng Liu¹, Yanjie Liang², Zhengwei Pan¹

Affiliations

¹ College of Engineering, University of Georgia, Athens, Georgia 30602, USA and Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602, USA.
² College of Engineering, University of Georgia, Athens, Georgia 30602, USA and Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials, Shandong University, Jinan 250061, China.

PMID: 25379936
DOI: 10.1103/PhysRevLett.113.177401

Abstract

Up-conversion luminescence and long-persistent luminescence are two well-studied, special luminescence processes. By combining the unique features of these two luminescence processes, here we design a new luminescence process called up-converted persistent luminescence (UCPL), which enables us to generate persistent luminescence having an emission energy higher than the excitation energy. Guided by the UCPL concept, we create the first UCPL phosphor Zn3Ga2GeO8:1%Cr3+, 5%Yb3+, 0.5%Er3+ by incorporating an up-converting ion pair Yb3+/Er3+ into a Zn3Ga2GeO8:1%Cr3+ near-infrared persistent phosphor. After being excited by a 980 nm laser, the phosphor emits long-lasting (>24 h) near-infrared persistent emission peaking at 700 nm. The UCPL concept and the associated phosphors are expected to have important implications for several fields such as biomedical imaging.