Integrated emission intensity variation of 5D0 to 7F0 transition from Eu3+-doped NaGdF4 nanocrystalsand relative extinction ratio with pulsed magnetic fields.
( J. Mater. Chem. C3, 10140-10145 (2015))
Background
Luminescence modulation, mainly including the modulation of emission intensity, wave band and chromaticity, has attracted tremendous interest for their applications in optics, electrics, magnetics, and optoelectronics. The approach to alter the active center or its surrounding environment of a luminescent material through chemical synthesis is widely accepted as one of the easiest and feasible methods. To date, extensive studies have put an utmost value on such direct and effective luminescence modulation. However, the chemical process in the materials is irreversible, which indicates that the chemical synthesis seems to not satisfy the controllable modulation process. Therefore, it has attracted great interest in the search for a controllable reversible way to modulate the luminescence. Herein, a physical approach, modulating the luminescence of materials via external stimuli such as electric fields, strain and magnetic fields, gains growing scientific interest in materials science. In this work, we will demonstrate the simultaneous luminescence modulation and magnetic field detection via magneto-optical response of Eu3+-doped NaGdF4 nanocrystals.
What we discover?
By increasing the strength of pulsed magnetic fields, the integrated intensity of 5D0 to 7F0 transition from Eu3+-doped NaGdF4 nanocrystals is linearly weakened with even 80% extinction ratio at 40 T. The magnetic confinement offelectron wave functions and the magnetic field assisted cross-relaxation mechanism were built to explain the interesting magneto-optical results for the first time. It is believed that 5D0 to 7F0 transition will be a promising sensitive optical probe for magnetic field detection.
Why is this important?
The integrated intensity of 5D0 to 7F0 transition from Eu3+-doped NaGdF4 nanocrystals is linearly weakened by the magnetic field, which could be used as a promising sensitive optical probe for magnetic field detection.
Why did they need WHMFC?
Magnetic field is an effective way to affect the seven-unpaired inner 4felectrons of Gd3+ in Eu3+-doped NaGdF4 nanocrystals, and then lead to thesimultaneous modulation of the luminescence properties.
Who did the research?
Yuanhao Zhang1, Quanlan Xiao1, Huilin He1, Junpei Zhang2, Guoping Dong1,Junbo Han2and Jianrong Qiu1
1State Key Laboratory of Luminescent Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
2Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China.
