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. 2019 Sep 5;9:12806. doi: 10.1038/s41598-019-49291-x

Figure 3.

Figure 3

Thermal sensitivity of the fluorescence lifetime of NaYF4: Nd3+, Yb3+ detected by NIR camera. (a) Fluorescence decay curves of NaYF4: Nd3+, Yb3+ in optical cuvette at different experimental temperatures. (b) Calibration curve of temperature vs. fluorescence lifetime detected by NIR camera. (c) Examples of fluorescence images of NaYF4: Nd3+, Yb3+ at delay times of 0, 0.4, and 0.8 ms and calculated lifetime collected at each experimental temperature with excitation by 808-nm pulsed laser (5 W/cm2) from the right side.