Fig. 5: ML properties of the phosphor/polymer composite elastomers.
From: Dynamic multicolor emissions of multimodal phosphors by Mn2+ trace doping in self-activated CaGa4O7
a ML spectrum collected during the application of mechanical friction, with photographs of the friction setup (top) and the visually observed ML (bottom) as insets. The red curved arrow denotes the frictional direction of the rod. b Transient ML response to mechanical friction (7.16 MPa, 4π rad s−1) after interval photoexcitation charging. Short dashed arrows between two adjacent vertical lines represent time periods when UV exposure is on, and long dashed arrows represent time periods when UV exposure is off. c Transient ML response to mechanical friction with different pressures (2.55 − 12.74 MPa, 4π rad s−1), with the ML photographs shown in insets. d Linear relation between ML intensity and pressure. Error bars represent standard deviation, n = 10 independent replicates. e Durable ML response under long-term cyclic mechanical friction (7.16 MPa, 6π rad s−1). The insets show the enlarged ML response of the regions marked by boxes. Scale bars = 5 mm. Source data are provided as a Source Data file.
