Cheap, flexible LEDs comprised of an organic-inorganic compound utilizing fast inkjet printing, are stretchy, bendy

https://source.wustl.edu/2021/10/stretchy-bendy-flexible-leds/

"Sure, you could attach two screens with a hinge and call a cell phone “foldable,” but what if you could roll it up and put it in your wallet? Or stretch it around your wrist to wear it as a watch?... used a particular type of crystalline material called an organometal halide perovskite... can be printed onto a variety of unconventional substrates... such as rubber... Imagine having a device that starts out the size of a cell phone but can be stretched to the size of a tablet"

Related:

Observations open door to improved luminous efficiency of organic LEDs

https://phys.org/news/2023-03-door-luminous-efficiency.html

Focus on perovskite emitters in blue light–emitting diodes

https://phys.org/news/2023-10-focus-perovskite-emitters-blue-lightemitting.html