Fig. 1. (a) Optical images of an array of micro LEDs on polydimethylsiloxane (PDMS) twisted to different angles. (b) Light-emitting suture on a thread (diameter ∼ 700 μm) in an animal model with a conventional suture needle. (c) Stretchable optical proximity sensor made of an array LEDs and photodetectors mounted on the fingertip of a glove after immersion into soapy water. (d) An injectable cellular-scale optoelectronic device consists of various components. (e) SEM images of the injectable array of LEDs with total thickness of 8.5 μm. (f) Photograph of the integrated system emitting blue light. Adapted with permission from ref. 28 (a–c), and from ref. 34 (d–f), respectively.
