Enhancing the generating and collecting efficiency of single particle upconverting luminescence at low power excitation

Nanophotonics

article

Chenshuo Ma¹  Chunyan Shan²  Kevin Park¹  Aaron T. Mok³  Paul J. Antonick¹  Xusan Yang³ 

[1] Department of Material Science and Engineering, The State University of New Jersey;School of Life Sciences, Peking University;School of Applied and Engineering Physics, Cornell University

关键词: upconverting;    low power;    single particle;   

DOI  :  10.1515/nanoph-2019-0526

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Upconverting luminescent nanoparticles are photostable, nonblinking, and low chemically toxic fluorophores that are emerging as promising fluorescent probes at the single molecule level. High luminescence intensity upconversion nanoparticles (UCNPs) have previously been achieved by doping with high amounts of rare-earth ions using high excitation power (>2.5 MW/cm 2 ). However, such particles are inadequate for in vitro live-cell imaging and single-particle tracking, as high excitation power can cause photodamage. Here, we compared UCNP luminescence intensities with different dopant concentrations and presented more efficient (about seven times) UCNPs at low excitation power by increasing the concentrations of Yb 3+ and Tm 3+ dopants (NaYF 4 : 60% Yb 3+ , 8% Tm 3+ ) and adding a core-shell structure.

【 授权许可】

CC BY