journal article·2019-10-08

Modulation of Surface Energy Transfer Cascade for Reversible Photoluminescence pH Sensing

Lei Lei, Han Xia, Chang-Keun Lim, Shiqing Xu, Ke Wang, Yaping Du, Paras N. Prasad

Chemistry of Materials· Volume 31· Issue 19
Publisher page

Abstract

Monitoring pH is of great importance in a diverse range of fields ranging from the industrial and agricultural to environmental and biomedical fields. Herein we introduce and demonstrate a sensing scheme that utilizes a pH-sensitive ligand, citric acid (CA), to modulate a cascaded energy transfer process in Ce3+-sensitized fluoride nanocrystals (NCs), resulting in a change of emission to provide pH sensing over a broad range from 3 to 10. The ligand modulates cascaded energy transfer from Ce3+ to Gd3+ and then to activators (Tb3+, Eu3+, and Mn2+) in the pH values from 3 to 10. The decreased energy transfer efficiency from Ce3+ to Gd3+ ions by a pH-responsive electronegativity alteration of the ligand at higher pH activates the sensing capability. All of the sensing properties are completely reversible and independent of sensor concentrations in the ratiometric analysis. Our findings provide a new promising pH sensing design based on inorganic fluoride NCs.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Luminescence Properties of Advanced Materials · Carbon and Quantum Dots Applications · Luminescence and Fluorescent Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Optoelectronic Materials and Devices, China Jiliang University, Hangzhou 310018, China

Institute for Lasers, Photonics, and Biophotonics and Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, United States

School of Pharmacy, Health Science Center, Xi’an Jiaotong University, Xi’an 710061, China

School of Materials Science and Engineering & National Institute for Advanced Materials, Centre for Rare Earth and Inorganic Functional Materials, Tianjin Key Lab for Rare Earth Materials and Applications, Nankai University, Tianjin 300350, China

Funding

State Administration of Foreign Experts Affairs · Ministry of Education of the People's Republic of China · Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Natural Science Foundation of Zhejiang Province

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