Abstract
The room temperature synthesis and photoluminescence properties of hexagonal phase NaBiF4 nanocrystals doped with lanthanide ions have been presented. An efficient infrared Stokes emission and upco...
Highlights
Optical nanosensors have been developed on a large scale in recent decades.[1,2] They can provide real-time monitoring, fast response time, high sensitivity and specificity, and the possibility of functionalization with chemical and biological molecules
We introduce the concept of integrating upconversion antiStokes green emission of Er3+ ions consisting of two bands at 520 and 540 nm and infrared Stokes emission at 1550 nm
The NaBiF4:Yb,Er particle size analysis of 50 particles from several low-resolution transmission electron microscopy (TEM) micrographs indicated that the average particle size was about 360 nm
Summary
Optical nanosensors have been developed on a large scale in recent decades.[1,2] They can provide real-time monitoring, fast response time, high sensitivity and specificity, and the possibility of functionalization with chemical and biological molecules. The possibility of applying a wavelength of 980 nm, which is used to excite Yb/Er, Yb/Tm, and Yb/Ho codoped nanocrystals, lays close to the first biological window of optical transparency.[6] Luminescence spectra of lanthanides consist of very narrow bands (atomic-like spectra); they exhibit long luminescence lifetimes due to the forbidden transition nature, large energy difference between absorption and emission bands, and strong resistance to photobleaching.[7] since 4f orbitals in lanthanides are not involved in chemical bonds, 4f−4f transitions are insensitive to the surrounding chemical environment All these features make lanthanide doped nanoparticles very good candidates for robust, multifunctional, and contactless sensors
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