KYb₂F₇:Er³⁺ based nanothermometers: controlled synthesis, enhanced red emission, and improved sensitivities via crystal-site engineering

Abstract

KYb2F7 nanocrystals have stimulated extensive research interest based on their unique structure and tunable upconversion (UC) properties for the development of different technological applications. Herein, the controlled synthesis of KYb2F7:Er3+...

Temperature and Pressure Sensing Using an Optical Platform Based on Upconversion Luminescence in NaSrY(MoO4)3 Codoped with Er3+ and Yb3+ Nanophosphors

“…In addition, we calculated the intensity ratio between two TCLs of Er 3+ (the whole 525/550 nm bands), which is shown in Figure S3. On the basis of previous studies, the fluorescence intensity ratio (FIR) values of Er 3+ ions were calculated using the formula 45,46…”

“…We already know that UC luminescence is a nonlinear luminescence process, and we know the precise relationship between the intensity of UC emission and the pump power excitation. The following formula may be used to express the dependence on the excitation power ( P ). , I = K × P n where n is the number of photons in the mechanism that triggers the change. Based on the slope of log( I ) and log( P ), the above equation can be used to figure out the value of n .…”

“…In addition, we calculated the intensity ratio between two TCLs of Er 3+ (the whole 525/550 nm bands), which is shown in Figure S3. On the basis of previous studies, the fluorescence intensity ratio (FIR) values of Er 3+ ions were calculated using the formula , FIR = A × ex p false( − normalΔ E / k B T false) where A is the constant of the fit, Δ E is the energy gap between involved levels, and T is the absolute temperature. The fitting parameters are presented in Table .…”