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. 2020 Nov 23;8(1):2001647. doi: 10.1002/advs.202001647

Figure 4.

Figure 4

Characterization of the stretchable EL loudspeaker. a) Photograph of the stretchable EL loudspeaker during sound recording using a microphone. Scale bar is 1.5 cm. b) Acoustic measurement system in which sound emitted from the stretchable EL loudspeaker is collected by a microphone. c) Effect of applied voltage on the SPL generated by the stretchable EL loudspeaker at an AC to DC voltage ratio of 3:1. d) Sound performance of stretchable EL loudspeaker for different AC to DC voltage ratios. e) Dependence of SPL on the distance between the microphone and the stretchable EL loudspeaker. f) Effect of angle on the SPL of the stretchable EL loudspeaker at 100 V and 10 kHz. The distance between the loudspeaker and the microphone equaled 2.5 cm. g) Dependence of loudspeaker SPL on tensile strain. h) Stability of sound performance during 5000 cycles of stretching to 100% strain. i) Sound performance stability of the stretchable EL loudspeaker during repeated 5000 on–off cycles.