This
is the “mobile” era, characterized by a growing
demand of flexible substrates for novel products such as curved screens,
folding smartphones, and wearable devices. In this framework, plastic
electronics represents a suitable technology to replace silicon-based
electronics. However, up to now, little attention has been devoted
to rendering this technology more environmentally sustainable. It
is thus necessary to develop new eco-designed devices that allow recycling
of all the components and recovering the valuable materials through
sustainable methods. For the first time, we report the fabrication
of organic light emitting diodes made on an as-cast biopolymeric flexible
substrate. Sodium alginate is a natural biodegradable polymer derived
from brown algae; it is water-soluble and easy to manipulate for the
realization of flat and transparent foils using an environmentally
friendly process. Thus, the active stack can be directly deposited
on the biopolymer substrate in a bottom-up architecture with no need
for a pretreatment or a buffer layer. In addition, the devices can
be disassembled and all of the valuable materials almost entirely
recovered. This result opens up new and exciting opportunities for
the fabrication of electronic and optoelectronic devices with a green
platform for an ambient sustainable circular economy.