Li5Zn8Ga5Ge9O36: Cr3+, Ti4+: A Long Persistent Phosphor Excited in a Wide Spectral Region from UV to Red Light for Reproducible Imaging through Biological Tissue. Issue 9 (21st March 2019)

• Record Type: Journal Article
• Authors: Zhou, Xinquan; Ju, Guifang; Dai, Tiansong; Li, Yang; Wu, Haoyi; Jin, Yahong; Hu, Yihua
• Is Part Of: Chemistry, an Asian journal. Volume 14:Issue 9(2019)
• Page Start: 1506
• Page End: 1514
• Publication Date: 2019-03-21
• Subjects: bioimaging -- imaging agents -- luminescence -- persistent phosphors -- tissue imaging; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/asia.201900158
• Languages: English
• ISSNs: 1861-4728

Abstract

Abstract: Near‐infrared (NIR) long‐persistent phosphors (LPPs) have emerged as a potential solution for bio‐imaging applications over the past few years. However, there are enormous challenges regarding their in situ application based on their dependence on short‐wavelength excitation. In this paper, we report a multi‐spectral excited NIR LPP, Li5 Zn8 Ga5 Ge9 O36 : 1.5 % Cr 3+, 0.5 % Ti 4+, which overcomes the limitations of functional processes in biological tissues and other complex systems. This LPP exhibits a high luminescent intensity and a long emission duration in the NIR region (700–800 nm). The applicability of this phosphor to tissue imaging is demonstrated experimentally. Its persistent luminescence (PersL) can easily penetrate approximately 2 mm of pork flesh. More importantly, this phosphor can be re‐charged in situ using a red LED or laser diode array to provide renewed NIR PersL for biological tissues, which is beneficial for long‐term biological tissue imaging applications with high signal‐to‐noise ratios. Systematic investigations of the nature of energy traps and PersL mechanisms are also reported in this paper. Abstract : Energy and persistence conquer all things : A multi‐spectral excited near‐infrared long persistent phosphor, Li5 Zn8 Ga5 Ge9 O36 : 1.5 % Cr 3+, 0.5 % Ti 4+, which can be re‐charged in situ using a red LED or laser diode array to provide renewed near‐infrared persistent luminescence for biological tissues has been fabricated.