Significant Enhancement of the Upconversion Emission in Highly Er3+-Doped Nanoparticles at Cryogenic Temperatures

被引：22

作者：

Tu, Langping ^{[1
]}

Wu, Kefan ^{[2
]}

Luo, Yongshi ^{[1
]}

Wang, Enhui ^{[3
]}

Yuan, Jun ^{[2
]}

Zuo, Jing ^{[3
]}

Zhou, Ding ^{[1
]}

Li, Bin ^{[1
]}

Zhou, Jiajia ^{[4
]}

Jin, Dayong ^{[4
,5
]}

Zhang, Hong ^{[2
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, State Key Lab Luminescence & Applicat, Changchun 130033, Jilin, Peoples R China

[2] Univ Amsterdam, Vant Hoff Inst Mol Sci, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands

[3] Jilin Univ, Coll Mat Sci & Engn, Minist Educ, Key Lab Automobile Mat, Changchun 130025, Peoples R China

[4] Univ Technol Sydney, Fac Sci, Inst Biomed Mat & Devices IBMD, Sydney, NSW, Australia

[5] Southern Univ Sci & Technol, Coll Engn, UTS SUSTech Joint Res Ctr Biomed Mat & Devices, Dept Biomed Engn, Shenzhen 518055, Guangdong, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2023年 / 62卷 / 07期

基金：

荷兰研究理事会;

关键词：

Cross Relaxation; High-Level Doping; Monte Carlo Simulations; Temperature; Upconversion Nanoparticle; PHOTODYNAMIC THERAPY; EXCITATION-ENERGY; LUMINESCENCE; NANOCRYSTALS; DYNAMICS; MIGRATION; SURFACE;

D O I：

10.1002/anie.202217100

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Relatively low efficiency is the bottleneck for the application of lanthanide-doped upconversion nanoparticles (UCNPs). The high-level doping strategy realized in recent years has not improved the efficiency as much as expected. It is argued that cross relaxation (CR) is not detrimental to upconversion. Here we combine theoretical simulation and spectroscopy to elucidate the role of CR in upconversion process of Er3+ highly doped (HD) UCNPs. It is found that if CR is purposively suppressed, upconversion efficiency can be significantly improved. Specifically, we demonstrate experimentally that inhibition of CR by introducing cryogenic environment (40 K) enhances upconversion emission by more than two orders of magnitude. This work not only elucidates the nature of CR and its non-negligible adverse effects, but also provides a new perspective for improving upconversion efficiency. The result can be directly applied to cryogenic imaging and wide range temperature sensing.

引用

页数：7

共 52 条

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