Simple ballpoint pen can write custom LEDs wustl NaturePhotonics
Paper and textiles that are commonly used in our daily lives hold great potential as platforms for next-generation flexible and wearable electronics. However, strategies for fabricating light-emitting diodes and photodetectors on different substrates are restricted in terms of their quantity and variety as strict flatness and smoothness are often required.
Our method uses common ballpoint pens filled with newly formulated inks of conductive polymers, metal nanowires and multiple perovskites for a wide range of emission colours. Just like writing with multicoloured pens, writing layer-by-layer with these functional inks enables perovskite optoelectronic devices to be realized within minutes. This process can be carried out by individuals without specialized training.
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