Temperature modulation of concentration quenching in lanthanide-doped nanoparticles for enhanced upconversion luminescence
Autor: | Jian-Ping Zhang, Xi-Cheng Ai, Ningjiu Zhao, Li-Min Fu, Jing Zhou, Luoyuan Li |
---|---|
Rok vydání: | 2018 |
Předmět: |
Lanthanide
Materials science Quenching (fluorescence) Photoluminescence Doping Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Photochemistry 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Ion General Materials Science Electrical and Electronic Engineering 0210 nano-technology Luminescence Spectroscopy |
Zdroj: | Nano Research. 11:2104-2115 |
ISSN: | 1998-0000 1998-0124 |
Popis: | The doping concentration of lanthanide ions is important for manipulating the luminescence properties of upconversion nanoparticles (UCNPs). However, the serious concentration quenching in highly doped UCNPs remains a vital restriction for further enhanced upconversion luminescence (UCL). Herein, we examined the effect of temperature on the concentration quenching of rare-earth UCNPs, an issue that has been overlooked, and we show that it is significant for biomedical or optical applications of UCNPs. In this work, we prepared a series of UCNPs by doping Er3+ luminescent centers at different concentrations in a NaLuF4:Yb3+ matrix. At room temperature (298 K), steady-state photoluminescence (PL) spectroscopy showed substantial concentration quenching of the Er3+ emission with increasing doping concentrations. However, the concentration quenching effect was no longer effective at lower temperatures. Kinetic curves obtained from time-resolved PL spectroscopy further showed that the concentration quenching dynamics were vitally altered in the cryogenic temperature region, i.e., below 160 K. Our work on the temperature-switchable concentration quenching mechanism may shed light on improving UCL properties, promoting their practical applications. |
Databáze: | OpenAIRE |
Externí odkaz: |