Thermal-induced local phase transfer on Ln3+-doped NaYF4 nanoparticles in electrospun ZnO nanofibers: Enhanced upconversion luminescence for temperature sensing

Ga3+ Doping Induced Simultaneous Size/Shape Control, Enhanced Red Upconversion Luminescence, and Improved X-ray Imaging of ZnO:Yb/Tm for Multifunctional Nanoprobes

“…Therefore, the UCNPs can significantly decrease thermal loading and minimize the tissue damage. − The use of UCNPs for the biological appliations has received increasing attention. However, as an optimal biological probe, the high UCL efficiency and multicolor UCL output are simultaneously required for UCNPs, which is still a challenge. , It is well-known that the UCL efficiency is related to particle size, crystallite phase, dopant ions, and host system. − In addition, size, shape, and phase of UCNPs have also great influence on their luminescence and biological application. − Compared with the sulfide hosts and fluoride hosts, oxide systems were addressed as the efficiency UCL hosts, owing to their high chemical stability and low toxicity. − …”

Temperature sensing and bio-imaging applications based on polyethylenimine/CaF2 nanoparticles with upconversion fluorescence

“…Then the 522 nm emission ( 2 H 11/2 → 4 I 15/2 ) rises with the reduction of 538 nm emission ( 4 S 3/2 → 4 I 15/2 ). Furthermore, the FIR between TCLs ( 2 H 11/2 / 4 S 3/2 ) can be given as follow [37][38][39]: [32]. The evolution of FIR (I 522 /I 538 ) with temperature is presented in Fig.…”

Structure, Crystallization and Optical Properties of Rare Earth Doped Oxyfluoride Glasses

“…However, the application of non-contact optical temperature sensing will be significant because it can precisely and conveniently measure the environment temperature. The principle for measuring temperature is via calculating the fluorescence intensity ratio (FIR) between 2 H11/2 and 4 S3/2 states, the thermally coupled energy levels (TCELs), of Er 3+ ions to evaluate the environment temperature (81)(82) (83). Thus, we assess the temperature sensing ability of the heat-treated 7YF sample.…”