Cross Relaxation Channel Tailored Temperature Response in Er3+‐rich Upconversion Nanophosphor

Author:

Wu Kefan12ORCID,Wang Enhui3,Yuan Jun2,Zuo Jing3,Zhou Ding4ORCID,Zhao Haifeng1,Luo Yongshi1,Zhang Ligong1,Li Bin1ORCID,Zhang Jiahua1,Tu Langping1ORCID,Zhang Hong2ORCID

Affiliation:

1. State Key Laboratory of Luminescence and Applications Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences 130033 Changchun Jilin China

2. Van't Hoff Institute for Molecular Sciences University of Amsterdam Science Park 904 1098 XH Amsterdam The Netherlands

3. Key Laboratory of Automobile Materials Ministry of Education) College of Materials Science and Engineering Jilin University 130025 Changchun Jilin China

4. Hospital of Stomatology Jilin University 130021 Changchun Jilin China

Abstract

AbstractRecently high doping of lanthanide ions (till 100 %) is realized unprecedentedly in nanostructured upconversion (UC) phosphors. However, oddly enough, this significant breakthrough did not result in a corresponding UC enhancement at ambient temperature, which hinders the otherwise very interesting applications of these materials in various fields. In this work, taking the Er3+‐rich UC nanosystem as an example, we confirm unambiguously that the phonon‐assisted cross relaxation (CR) is the culprit. More importantly, combining the theoretical modeling and experiments, the precise roles of different CR channels on UC energy loss are quantitatively revealed. As a result, lowering the temperature can exponentially enhance the relevant UC luminescence by more than two orders of magnitude. Our comprehension will play an important role in promoting the UC performance and further application of high doping rare earth materials. As a proof of concept, an Er3+‐rich core/multi‐shell nanophosphor is exploited which demonstrates the great potential of our finding in the field of ultra‐sensitive temperature sensing.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Chemistry,Catalysis

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