Synthesis of NaYF₄:Ho³⁺/Yb³⁺ colloidal upconversion phosphor and its application for OCT-based imaging, temperature sensing, fingerprinting and security ink

Abstract

In this work, an NaYF4:Ho3+/Yb3+ upconversion phosphor in colloidal form was synthesized and then its suitability for image contrast enhancement in optical coherence tomography (OCT) and photothermal (PT) OCT imaging was analysed.

Assessment of NIR-triggered PEG-coated NaGdF4:Tm3+/Yb3+ bio-compatible upconversion nanoparticles for contrast enhancement in OCT imaging and optical thermometry

“…The utilization of a distinct class of molecules known as upconversion (UC) molecules to convert nearinfrared (NIR) radiation into visible or ultraviolet light has garnered significant attention. This attention stems from the broad range of applications it offers, spanning from optical thermometry to biomedical imaging [1][2][3][4][5][6][7]. Among the materials explored for this purpose, inorganic fluoride materials doped with rare earth ions have proven to be particularly well-suited and have been investigated for a multitude of applications.…”

Synthesis and upconversion emission studies of CaYF5:Ho3+/Yb3+ phosphor and its applications in optical thermometry, fingerprint detection, and security ink

“…Inorganic materials doped with lanthanide ions have found tremendous applications across various elds like temperature sensing, bio-imaging, solar cells and security. [1][2][3][4][5][6][7][8][9][10] They have some unique features of converting NIR photons to intense visible or UV photons, atomic emissions like narrow line width and long lifetime. They are usually composed of a low phonon host matrix with suitable rare earth ions doped within it.…”

A preparation strategy for multicolor carbon dots embedded in silicone for latent fingermarks and detection of AcO−

“…Therefore, the physical and chemical treatment of LFPs is essential for detection accuracy and identification. In the last decade, nano fluorescent materials (such as quantum dots, 1,2 upconversion nanomaterials, 3,4 traditional organic fluorescent dyes, 5,6 aggregation-induced emission (AIE) dyes, 7 carbon dots, etc. ) have provided lots of innovative ideas for the detection of LFPs due to their good optical, electronic and surface modifiable properties.…”